БЫСТРОДЕЙСТВУЮЩИЙ ИСТОКОВЫЙ ПОВТОРИТЕЛЬ НАПРЯЖЕНИЯ

Изобретение относится к области радиотехники и связи и может использоваться в различных аналоговых устройствах на полевых и биполярных транзисторах в качестве выходного (буферного) усилителя. Техническим результатом является расширение диапазона рабочих частот ИПН при наличии емкости на выходе С, а также уменьшение времени установления переходного процесса при импульсном изменении входного напряжения. Быстродействующий истоковый повторитель напряжения содержит первый (1) входной полевой транзистор, затвор которого подключен ко входу (2) устройства, сток соединен с первой (3) шиной источника питания, а исток связан со второй (4) шиной источника питания через токостабилизирующий двухполюсник (5) и подключен к выходу устройства (6), паразитную емкость нагрузки (7), включенную по переменному току между выходом устройства (6) и общей шиной источников питания (8). В схему введен дополнительный неинвертирующий усилитель напряжения (9), вход которого соединен с выходом устройства (6), а выход подключен ...

Оконечный каскад лампового усилителя

Избирательный с-усилитель

Усилитель низкой частоты

УСТРОЙСТВО ДЛЯ ПРИЕМА ТЕЛЕГРАФНЫХ СИГНАЛОВ

Устройство для компенсации нелинейных и частотных искажений, вносимых усилителем и электродинамическим громкоговорителем

Усилитель низкой частоты

Verstaerkerschaltung mit Gegenkopplung

Verstaerker mit bedingt stabiler Gegenkopplung

Verstaerker fuer elektrische Schwingungen mit Gegenkopplung

Elektromechanischer Wandler mit Gegenkopplung zur Aufzeichnung und Wiedergabe von Schallschwingungen in Einkomponentenschrift

Verfahren zur Tonuebertragung auf mehreren Kanaelen

Mit selektiven Gegenkopplungsvierpolen zusammenarbeitender Rohrenwiderstandsverstaerker

Abgestimmter Verstaerker mit einer Einrichtung zur Bandbreitenregelung

Rueckgekoppelte Verstaerkeranordnungen

VERSTAERKER FUER HOCHFREQUENTE ELEKTRISCHE SCHWINGUNGEN

Improvements in circuit arrangements for coupling electric generators to loads

... 486,286. Preventing inductive and other disturbance. NAAMLOOZE VENNOOTSCHAP PHILIPS' GLOEILAMPENFABRIEKEN. Nov. 20, 1937, No. 32001. Convention date, Nov. 23, 1936. [Class 40 (iv)] [Also in Group XL] An amplifier with negative reaction is inserted between a generator feeding two or more electric circuits and the circuits to reduce cross talk, the negative reaction being adjusted so that the amplifier has a low internal resistance. As shown the generator e feeds the two modulators M1, M2 through the amplifier which is back coupled by means of the potentiometer P. By suitably adjusting P the effective internal resistance of the tube can be reduced to a negligible amount. Resistances R may be provided if desired to reduce still further the coupling between the circuits.

Electro-mechanical vibration translating systems

... 518,442. Electro-acoustic apparatus; thermionic amplifiers. ELECTRICAL RESEARCH PRODUCTS Inc. Sept. 29, 1938, No. 28295. Convention date, Oct. 7, 1937. [Class 40 (iv)] [Also in Group XL] In an electro-mechanical vibration-translation system, e.g., for recording sound, having a magnetic circuit defining two spaced air gaps 14, 18 and a vibrating assembly comprising a resiliently-mounted member 20 supporting a driving coil 15 in one gap and a driven coil 19 in the other gap, the electrical energy generated by the vibration of the driven coil is fed back to the driving coil in phase opposition to the driving energy and the mass and stiffness of the vibrating assembly are so proportioned that it has a single resonant frequency in the range of frequency over which the system is intended to operate. The gaps are formed by an annular pole piece 13 and a centre pole piece 12 and by a spaced pole piece 16 and an extension 17 secured to the centre pole piece. A shield between the driving and driven ...

Thermionic valve and like wave amplifying systems

... 524,340. Automatic volume control. STANDARD TELEPHONES & CABLES, Ltd. Jan. 27, 1939, No. 2892. Convention date, March 29, 1938. [Class 40 (iv)] [Also in Group XL] In a negative feedback amplifier means are provided to change the transmission efficiency of the feedback path and inversely to change the transmission efficiency of the forward path around which the feedback is connected. The Figure shows an arrangement in which control dependent on weather conditions is effected over a pilot circuit control 21 or over a pilot channel regulator control 23 by varying the heating of silver sulphide resistances 9, 12.

Improvements in or relating to negative feedback amplifiers

... 672,332. Valve amplifying circuits. WESTERN ELECTRIC CO., Inc. Jan. 25, 1950 [Jan. 26, 1949], No. 1961/50. Class 40 (vi). In a negative feed-back amplifier the loop gain, over the larger part of the useful passband, decreases with increase of frequency substantially at a rate of 6 db. per octave and in addition is substantially equal to the secant of the corresponding phase-shift. The arrangement is more particularly applicable to obtaining a high degree of gain stability in wideband amplifiers, in which it is difficult to apply more than a limited amount of feed-back. The Specification gives an exposition of the theoretical considerations upon which the invention is based, referring to Specification 514,567 and U.S.A. Specification 2,102,671 and describes its application to a three-stage amplifier of low-pass type, Fig. 1. Loop gain and phase-shift characteristics are chosen, Figs. 2, 3, respectively, such that at high frequencies the gain falls at 18 db. per octave, the corresponding ...

Improvements in electric loudspeaker amplifying systems

... 700,129. Circuits for magnetic instruments. STANDARD TELEPHONES & CABLES, Ltd. July 27, 1951 [Aug. 2, 1950], No. 17856/51. Class 40 (4) [Also in Group XL (c)] In an arrangement, comprising an amplifier and a loudspeaker, the amplifier is :provided with frequency-dependent Voltage and current negative feedback which causes the output impedance to increase with frequency and thus improves the transient response of the loudspeaker. Voltage feedback is provided from the anode circuit of valve V2, Fig. 6, to the cathode of valve V1 by resistors R1, R2 and condenser C1, and current feedback is provided from the cathode of valve V2 to the grid of valve V1 by resistors R3; R4 and Condenser C3. The use of blocking condenser C2 which may have undesired effects is avoided in a modified circuit, Fig. 7 (not shown), wherein the voltage feedback is provided by a T- network between the two anodes. In a further modification, two amplifiers driving separate high and low frequency loudspeakers have current ...

Improvements in or relating to audio frequency amplifiers

... 713,694. Valve amplifying circuits. COLE, Ltd., E. K., and BURNARD, C. L. March 2, 1953 [March 1, 1952], No. 5440/52. Class 40 (6) In an audio amplifier, frequencies above the range to be reproduced are attenuated, particularly at low volume levels, by means of a feedback path between the anode of an output valve V3 and the low potential end of the volume control potentiometer V.C. The feedback path comprises condensers C1, 2 and resistances R1, 2 forming a high-pass filter. Specification 494,024 is referred to.

ELECTROSTATIC LOUDSPEAKER

... 1319651 Electrostatic loudspeakers; acoustic lenses H N BEVERIDGE 12 June 1970 [17 June 1969] 28571/70 Heading H4J and H4X Adjacent the front of an electrostatic loudspeaker 10 (Fig. 1) is an acoustic lens 20 (Fig. 5) having a throat 20t, the lens 20 being made up of a set of channels defined by walls 20 1 , 20 2 ... 20 19 . Each channel has an inlet located adjacent a different surface portion of the loudspeaker diaphragm 12. Channels associated with neighbouring surface portions have their outlets in like neighbouring relationship. Each channel has a constricted throat portion. At the throat 20t the channels are substantially perpendicular to the planar diaphragm 12. Beyond the throat 20t the channels diverge to provide radiation through an angle of substantially 180 degrees. The centre wall of the lens is, however, straight. The outlet axes of the various channels may be traced back to intersect at a common point (C) Fig. 2 (not shown) in front of the throat 20t. Preferably the curvature ...

Improvements in or relating to noise reducing arrangements for discharge tube amplifiers

... 645,935. Radio receiving circuits. PHILIPS LAMPS, Ltd. Sept. 6, 1946, No. 26866. Convention date, Nov. 12, 1942. Addition to 645,936. [Class 40 (v)] In a tuned amplifier circuit of the type described in the parent Specification, in which damping by negative feed-back derived from a cathode inductance 4 and the grid-cathode capacity 5 is used to improve the signal to noise ratio, the input circuit inductance 2 comprises a frame aerial.

Improvements in or relating to amplitude modulated radio transmitters

... 758,294. Modulating systems. STANDARD TELEPHONES & CABLES, Ltd. July 9, 1954 [July 9, 1953], No. 20152/54. Class 40 (5). In a Class C operated transmitter including a low-frequency amplifier A for supplying modulation to the modulator tube V a negative feedback signal is applied to the input of amplifier A of amplitude proportional to the audio frequency component of the cathode or other electrode, e.g. anode, current of the modulator tube V.

Improvements in and relating to thermionic valve amplifiers

... 425,553. Valve amplifying circuits. ELECTRIC & MUSICAL INDUSTRIES, Ltd., Blyth Road, Hayes, Middlesex, BLUMLEIN, A. D., 32, Woodville Road, Ealing, and CLARK, H. A. M., 119, Wynchgate, Southgate, both in London. Sept. 18, 1933, No. 25797. [Class 40 (v)] In a thermionic power amplifier, particularly of the pentode type, negative feed-back of the voltage developed across the load circuit is used to reduce the apparent output impedance of the amplifier, whilst negative feed-back determined by the current in the load is used to increase the valve impedance. The first effect is applied to reduce harmonic distortion, whilst both effects are utilized when it is desirable that the amplifier should work into a load of lower impedance than its own, the voltage feedback in that case being made greater than the " current " feed-back. Similarly if the normal impedance of the load exceeds that of the valve, the "current" feed-back is made predominant. In general the current and voltage feedback components ...

Circuit arrangements and thermionic valves for amplifying electrical oscillations

... 515,271. Valve amplifying circuits. STANDARD TELEPHONES & CABLES, Ltd., BLACK, D. H., and ROCHE, A. H. May 27, 1938, No. 15935. [Class 40 (v)] The negative feedback voltage of an amplifier is derived from an auxiliary positive electrode arranged between the control electrode and the output anode of the valve. The feedback voltage may be derived solely from an impedance R14, Fig. 2, in the circuit of the auxiliary electrode or partly therefrom and partly from voltage produced by the output current in impedance R13. The impedance in the circuit of the feedback electrode is preferably proportioned to the impedance in the output anode circuits in the ratio of the currents carried by the two electrodes, or so that the harmonics in the feedback circuit are greater than those developed in the anode circuit. The impedance in the circuit of the feedback electrode may be frequency dependant and be such as to reduce the output impedance of the amplifier. The output impedance may be controlled by adjusting ...

Improvements in or relating to feedback amplifiers

... 635,695. Valve amplifying circuits. DUERDOTH, W. T. Nov. 26, 1946, Nos. 34976/46 and 16347/47. [Class 40 (vi)] In a feedback amplifier having at least two negative feedback paths each applying a voltage to an input circuit of the amplifier, the voltage applied to one feedback loop is derived from a point in the forward path of the amplifier so that the feedback voltage is unaffected by stray valve capacities, the ultimate slope of the gain/frequency characteristic of the loop being lower than that of another feedback loop so that the ultimate slope of the gain/ frequency characteristic of the combined feedback loops beyond either or both ends of the working band of the amplifier is decreased and in this way the amplifier is rendered stable or the margin of its stability is increased. Fig. 6 shows an amplifier having a main negative feedback path from the output transformer T2 via the feedback transformer T3 to the input transformer T1 which has the gain/ frequency characteristic shown in ...

Amplifier for feeding a reactive load

... 1,028,383. Valve and transistor amplifying and gating circuits. RANK-BUSH-MURPHY Ltd. Oct. 29, 1964 [Oct. 29, 1963], No. 42622/63. Heading H3P, H3T and H3W. In a push-pull amplifier, more especially for feeding a reactive load 7, the cathode of each output valve 1, 2 is returned to ground via an un-bypassed resistor 8, 9, respectively, and negative feedback is applied by means of a tertiary winding 13 on the output transformer 5, which is connected, in series with resistor 12 and D.C. blocking capacitor 14, between the cathodes. The output stage is driven by means of a pair of transistors 21, 22 each of which has an individual un-bypassed emitter resistor 25, 26, respectively, the two emitters being connected together by a resistor and D.C. blocking capacitor in series. The arrangement may be switched off, either by opening the positive supply to the screen-grids of the output valves 1, 2 by means of a switch 39, or alternatively by applying a positive pulse via terminal 36 and capacitor ...

Thermionic valve amplifying systems

... 514,713. Valve amplifying circuits. STANDARD TELEPHONES & CABLES, Ltd., ROCHE, A. H., and GOULLEE, S. J. May 13, 1938, No. 14355. [Class 40 (v)] In a negative feedback amplifier in which a blocking condenser in one arm of the output bridge has appreciable impedance another condenser is inserted in an adjacent arm of the bridge to maintain the output impedance constant. The Figure shows an amplifier in which a condenser C10 is added to the output bridge R<13>, R<14>, R<15>, to compensate for the condenser C<9>. A decoupling resistance is provided so that variation in the impedance of the HT supply does not affect the balance of the output bridge. Gain control may be obtained by changing the feedback connection from CA to CB in which case a resistance R' equal to R3 is preferably included in the feedback circuit to maintain the correct termination. With reduced feedback the link HF is preferably opened for the condenser C<8> which corrects for rise in the output impedance at high frequencies ...

Improvements in multi-stage thermionic valve amplifiers

... 567,021. Thermionic amplifiers. FURZEHILL LABORATORIES, Ltd., MILSOM, F. R., and SMITH & SONS (ENGLAND), Ltd., S., (formerly SMITH & SONS (MOTOR ACCESSORIES), Ltd., S.). July 27, 1943, No. 12235. [Class 40 (v)] In a multi-stage amplifier the signal currents from two valves, one of which is the output stage, are arranged to generate equal and opposite signal voltages in two high-tension bus-bars, both of which are connected to a preceding stage or stages. The Figure shows an arrangement in which the high-tension supply has an internal impedance Z0 and bus-bars A; B include impedances Z1, Z2. The screen and anode voltages for the stage V1 are fed through equal impedances RR, PP from the bus-bars, and means, such as the variable resistance Z2, may be provided to ensure that equal and opposite signal voltages are generated in the bus-bars. The valves generating the signal voltages in the bus-bars may be a push-pull pair or one may be a supplementary valve as in the paraphase circuit.

Arrangement for increasing the selectivity of electric amplifying apparatus

Improvements in or relating to photo-electric apparatus

... 616,012. Thermionic valve amplifying circuits. PHILIPS LAMPS, Ltd. Aug. 19, 1946, No. 24611. Convention date, Dec. 4, 1942. [Class 40 (iii)] [Also in Group XL (c)] A photo-electric cell F is illuminated by light greater than that normally permissible and its output is applied to an amplifier V with negative feed-back T.C. so that the current through the cell is reduced to that normally permissible, thus improving the signal/noise ratio. The feed-back may be applied to a grid in the cell, Fig. 2, (not shown). Specification 394,121 is referred to.

Improvements in or relating to electric oscillation generators amplifiers and the like

... 631,263. Valve circuits. SOC. ALSACIENNE DE CONSTRUCTIONS MECANIQUES. March 28, 1947, No. 8532. Convention date, April 13, 1946. Drawings to Specification. [Class 40 (vi)] The Specification states that a feedback amplifier or oscillator may be stabilized by arranging that the cosine of the phase shift angle is at least equal to the inverse of the gain multiplied by the attenuation in the feedback path.

A parallel assembly of amplifiers

Improvements in or relating to Feedback Amplifier Systems

... 1,180,200. Negative feedback amplifying circuits. SIEMENS A.G. 26 July, 1967 [27 July, 1966], No. 61505/68. Divided out of 1,178,039. Heading H3T. In an amplifier having a first negative feedback path in series with both the input and output circuits of the amplifier, and a second negative feedback path in parallel with both the input and output circuits of the amplifier, the first feedback path takes the form of a twoterminal device #s comprising resistance and reactance in parallel, while the second feedback path is in the form of a T-network # 1 , # 2 , # p , at least one of the series arms of which is resistive: the shunt arm of the T-network is reactive and the ratio of its reactance to the reactance of the two terminal device is made less by 1 than the ratio of the resistance of the said one series arm and the resistance of the two-terminal network. It is shown in the Specification that if (1) the amplifier is terminated in a resistive load Z A and the input series arm # 1 of the ...

Improvements in thermionic amplifiers

... 479,808. Valve amplifying circuits. STANDARD TELEPHONES & CABLES, Ltd. April 1, 1937, No. 9300. Convention date, April 1, 1936. [Class 40 (v)] In an amplifier in which a negative feedback connection forms one diagonal of a bridge of which the other diagonal is formed by the load circuit and in which one of the arms comprises the discharge path of the output valve, a non-linear resistance such as that made from silicon carbide and clay as described in U.S.A. Specification 1,822,742 is used in another arm to ensure that the bridge remains balanced in spite of impedance variations in the discharge path. As shown in the Figure, the output valve is operated class B fashion and the non-linear resistance T is arranged in series with a blocking condenser and so is affected only by changes in the alternating current through it. In a modification, Fig. 4 (not shown), the non-linear resistance is in the position occupied in Fig. 1 by the resistance KRO and so responds to changes in the steady plate ...

Improvements in or relating to electron discharge device amplifiers

... 458,449. Valve amplifying circuits. MARCONI'S WIRELESS TELEGRAPH CO., Ltd., Electra House, Victoria Embankment, London, and WRIGHT, G. M., Broom Hall, Woodham Ferrers, Essex. June 21, 1935, No. 17927. [Class 40 (v)] In an amplifier distortion components are separated out in the output circuit at a point which is at constant potential when no distortion is present and applied subsequently to compensate for the distortion. The Figure shows a potentiometer 7, 8 connected between a tapping 6 on the output 5 and the grid of the valve 3 so that a distortion component equal to 1/2m of the output of the valve 3 is applied to an auxiliary valve 11 where m is the magnification of the valve 3. The valve 11 is chosen to have a magnification 2m so that its output combined with the output of the valve 3 by a high resistance potentiometer 14, 15 compensates for the distortion.

Means for controlling the gain of wave amplifying devices

An inductance coil is provided with a core of magnetic material of which the permeability varies rapidly with temperature. Such material may consist of an alloy containing 12,5 per cent of molybdenum, 80 per cent of nickel, and the rest mainly iron.

Improvements in or relating to electronic amplifiers

... 871,427. Valve amplifying circuits. NATIONAL RESEARCH DEVELOPMENT CORPORATION. Nov. 4, 1957 [Aug. 8, 1956], No. 24267/58. Class 40(6) A wideband, multistage amplifier of the virtual earth type has the resistive feedback path Rfb shunted by capacitance C#b so as to swamp the effect of stray capacitance and the output point, from which the feedback is taken, is shunted by a separate capacitance Ca to compensate for the increase in time constant of the feedback path. The time constants of output and feedback paths are preferably equal. The amplifier may be fed from a capacitance source such as a storage tube or television camera. Cfb is made 5 % of Cin. Conventional interstage potential dividers are included. Instability due to disconnection of input may be prevented by connecting a capacitor across Rk or a resistor in series with Ca. Fig. 3 (not shown) gives frequency response curves. Specification 604,671 is referred to.

Amplifier for a broad range from low frequencies

Loudspeaker

Low-complexity nonlinear filters

Schaltung mit thermionischen Röhren, bei der Energie vom Ausgangskreis einer Röhre in den Eingangskreis einer Röhre rückgekoppelt wird.

Einrichtung zur automatischen Regelung der Übertragungscharakteristik in einer Signalübertragungsanlage.

Eingangssymmetrieschaltung in gegengekoppeltem Verstärker.

Elektronenröhrenverstärker.

Verstärkereinrichtung mit negativer Rückkopplung.

Verstärkerschaltung mit Gegenkopplung.

Elektrische Verstärkereinrichtung.

Verstärker mit negativer Rückkopplung.

Verfahren zum Betrieb von Sendern zur drahtlosen Nachrichtenübermittlung.

Dispositif à lampes thermoioniques.

Uberlagerungsempfangsschaltung.

Röhrenschaltung.

Mehrstufige Verstärkeranordnung mit negativer Rückkopplung.

Gegenkopplungsschaltung.

Elektrische Wellenübertragungsanlage.

Verstärker für Gegensprechanlagen.

Mehrstufiger Verstärker mit Gegenkopplung.

Verstärkereinrichtung.

Schaltung zum Expandieren von elektrischen Schwingungen.

Gegengekoppelter Verstärker.

Hochfrequenz-Röhrenverstärker.

Niederfrequenzverstärker mit elektrodynamischem Lautsprecher.

Gegenkopplungsschaltung in Hochfrequenzstufen.

Verstärker, dessen Ausgangsspannung oder -strom von seiner Belastungsimpedanz unabhängig ist.

Schaltung zur Unterdrückung einer oder mehrerer Störschwingungen bei gleichzeitiger Verstärkung von Schwingungen anderer Frequenzen.

Photoelektrische Vorrichtung mit einer Lichtquelle, deren Licht ein Signal enthält.

Röhrenschaltung mit einer Röhre mit mindestens drei hintereinander angeordneten Zwischenelektroden.

Schaltung zur Verringerung der Verzerrung eines Verstärkers.

Verstärker mit Gegenkopplung.

Dispositif d'amplification comportant deux amplificateurs semblables à réaction négative.

Verstärker mit Gegenkopplung.

Amplificateur à réaction.

Amplificateur d'ondes électriques à réaction négative.

Verstärkerschaltung.

Amplificateur d'ondes électriques à contre-réaction.

Dispositif amplificateur d'oscillations électriques.

Mehrstufiger aperiodischer Verstärker.

Gegengekoppelter Breitbandverstärker.

Gegentaktverstärker.

Gegengekoppelter Verstärker.

Dispositif amplificateur à plusieurs étages et à contre-réaction.

Schaltung mit erhöhter Rauschfreiheit zur Übertragung elektrischer Hochfrequenzschwingungen.

Anordnung zur ganzzahligen Frequenzwandlung.

Anlage mit gegengekoppeltem Tonfrequenzverstärker.

Circuit de liaison pour relier une ligne de transmission symétrique à une ligne de transmission dissymétrique.

Radioempfänger mit einem durch akustische Kopplung in Schwingungen geratenden Abstimmkondensator.

Anordnung zur Erzielung einer gleichmässigen Verteilung der Belastung auf die einzelnen, parallel geschalteten Verstärker einer Verstärkeranlage.

Schaltung zum Expandieren von elektrischen Schwingungen.

Schaltungsanordnung zur Erzielung einer Dämpfung in einem im Eingang einer Verstärkerröhre liegenden Schwingkreis.

Verstärker mit zwecks Änderung des Verstärkungsgrades einstellbarer Gegenkopplung.

Schaltung mit erhöhter Rauschfreiheit zur Übertragung elektrischer Hochfrequenzschwingungen.

Dispositif amplificateur d'oscillations électriques.

Schaltung mit erhöhter Rauschfreiheit zur Übertragung elektrischer Hochfrequenzschwingungen.

Dispositif amplificateur.

Dispositif d'amplification.

LINEAR AMPLIFIER THAT PERFORM LEVEL SHIFT AND METHOD OF LEVEL SHIFTING

A linear amplifier that comprises a signal input terminal that receives an input signal having a first common mode voltage, a voltage amplifier having a non-inverting input terminal that receives a second common mode voltage, a first and a second input resistance connected in series from the signal input terminal to the inverting input terminal of the voltage amplifier, a feedback resistance connected between the inverting input terminal and the output terminal of the voltage amplifier, and a constant current source. The constant current source supplies a constant current to a middle node between the first and the second input resistances. The constant current generates a voltage drop, which is equal to a difference between the first and the second common mode voltages, across the first input resistance. Accordingly, the common mode voltage of the output signal is directly determined by the second common mode voltage. 1. A linear amplifier comprising:a signal input terminal that receives an input signal having a first common mode voltage;a voltage amplifier having an inverting input terminal, a non-inverting input terminal to which a second common mode voltage is supplied, and an output terminal that outputs an output signal;a first and a second input resistance connected in series from the signal input terminal to the inverting input terminal of the voltage amplifier;a feedback resistance connected between the inverting input terminal and the output terminal of the voltage amplifier; anda constant current source that supplies a constant current to a middle node between the first and second input resistances, the constant current generates a voltage drop, which is equal to a difference between the first and second common mode voltages, across the signal input terminal and the middle node.2. The linear amplifier according to claim 1 , wherein the constant current source includes:a current generating resistance connected between the first and second common mode ...

SEMICONDUCTOR INTEGRATED CIRCUIT AND RADIO COMMUNICATION TERMINAL INCLUDING THE SAME

A semiconductor integrated circuit includes an operational amplifier that amplifies a voltage difference between an input voltage supplied to an inverting input terminal and a reference voltage supplied to a non-inverting input terminal and outputs an amplified signal, a feedback resistor that performs negative feedback of the amplified signal to the inverting input terminal of the operational amplifier, and a variable resistor unit that sets a current path with a first resistance value in accordance with a control signal between an external input terminal and the inverting input terminal of the operational amplifier, and sets a first alternative path with a second resistance value in accordance with the control signal between a node on the current path and a reference voltage terminal to which the reference voltage is supplied. 1. A semiconductor integrated circuit comprising:an operational amplifier that amplifies a voltage difference between an input voltage supplied to an inverting input terminal and a reference voltage supplied to a non-inverting input terminal and outputs an amplified signal;a feedback resistor that performs negative feedback of the amplified signal to the inverting input terminal of the operational amplifier; anda variable resistor unit that sets a current path with a first resistance value in accordance with a control signal between an external input terminal and the inverting input terminal of the operational amplifier, and sets a first alternative path with a second resistance value in accordance with the control signal between a node on the current path and a reference voltage terminal to which the reference voltage is supplied.2. The semiconductor integrated circuit according to claim 1 , wherein the variable resistor unit sets the first alternative path between the inverting input terminal of the operational amplifier and the reference voltage terminal.3. The semiconductor integrated circuit according to claim 2 , wherein the variable ...

TRANSIMPEDANCE AMPLIFIER

A method of forming a circuit includes forming a transimpedance amplifier having a first input node and a second input node. The method also includes forming a feedback circuit having a first transistor having a drain terminal connected to the first input node, a source terminal, and a gate terminal, a second transistor having a drain terminal connected to the second input node, a source terminal, and a gate terminal, and a third transistor having a drain terminal connected to the source terminal of the first transistor and the source terminal of the second terminal. 1. A method of forming a circuit comprising;forming a transimpedance amplifier having a first input node and a second input node;forming a feedback circuit comprising a first transistor, a second transistor, and a third transistor;connecting a drain terminal of the first transistor to the first input node;connecting a drain terminal of the second transistor to the second input node; andconnecting a drain terminal of the third transistor to a source terminal of the first transistor and to a source terminal of the second transistor.2. The method of claim 1 , wherein the third transistor comprises a gate terminal connected to a bias voltage source.3. The method of claim 1 , wherein the transimpedance amplifier further comprises a first output node and a second output node.4. The method of claim 3 , further comprising connecting the first output node to a gate terminal of the first transistor via a low pass filter.5. The method of claim 4 , further comprising connecting the second output node to a gate terminal of the second transistor via the low pass filter.6. The method of claim 1 , further comprising forming a current output device connected to the first input node.7. The method of claim 6 , wherein the current output device is a photodiode.8. The method of claim 4 , wherein the transimpedance amplifier further comprises a first single-ended inverter portion and a second single-ended inverter portion.9. ...

MULTI-MODE OPAMP-BASED CIRCUIT

A multi-mode OPAMP-based circuit is provided. An input amplifying stage amplifies a pair of input differential signals to provide a pair of intermediate differential signals. An output amplifying stage amplifies the pair of intermediate differential signals to provide a pair of output differential signals. A first capacitor is disposed in a first negative feedback loop of the output amplifying stage. A second capacitor is disposed in a second negative feedback loop of the output amplifying stage. A third capacitor is selectively disposed in a first positive feedback loop of the output amplifying stage or coupled to the first capacitor in parallel according to a control signal. A fourth capacitor is selectively disposed in a second positive feedback loop of the output amplifying stage or coupled to the second capacitor in parallel according to the control signal. 1. A multi-mode OPAMP-based circuit , comprising: an input amplifying stage, amplifying a pair of input differential signals to provide a pair of intermediate differential signals;', 'an output amplifying stage, amplifying the pair of intermediate differential signals to provide a pair of output differential signals; and', a first capacitor disposed in a first negative feedback loop of the output amplifying stage;', 'a second capacitor disposed in a second negative feedback loop of the output amplifying stage;', 'a third capacitor selectively disposed in a first positive feedback loop of the output amplifying stage or coupled to the first capacitor in parallel according to a control signal; and', 'a fourth capacitor selectively disposed in a second positive feedback loop of the output amplifying stage or coupled to the second capacitor in parallel according to the control signal., 'a compensation unit, comprising], 'an operational amplifier, comprising2. The multi-mode OPAMP-based circuit as claimed in claim 1 , wherein the capacitances of the first and second capacitors are identical claim 1 , and the ...

AMPLIFIER CIRCUIT AND FEEDBACK CIRCUIT

An amplifier circuit whose frequency response has almost no soft knee characteristic or no peak when inverting input capacitance Csin varies and when feedback capacitance Cf is a fixed value of small capacitance, and a feedback circuit is provided. The amplifier circuit includes a plurality of amplifiers each of which negative feedback is provided to and which are connected in series, and a feedback means (feedback circuit) which is connected to an output side of an amplifier near output of the amplifier circuit and an input side of an amplifier near input of the amplifier circuit. These amplifiers are ones in the plurality of amplifiers. One or odd numbers of amplifiers in the plurality of amplifiers are inverting amplifiers. 1. A feedback circuit that is used along with an amplifier , the feedback circuit comprising:a first resistance;a first capacitor;a buffer amplifier; anda parallel circuit of a second resistance and a second capacitor,wherein one end of the first resistance is connected to an output side of the amplifier, one end of the first capacitor and an input side of the buffer amplifier are connected to another end of the first resistance, another end of the first capacitor is grounded alternately, one end of the parallel circuit is connected to an output side of the buffer amplifier, and another end of the parallel circuit is connected to an input side of the amplifier, so that a product of a resistance value of the first resistance and a capacitance value of the first capacitor is equivalent to a product of a resistance value of the second resistance and a capacitance value of the second capacitor.2. A feedback circuit that is used along with an amplifier , the feedback circuit comprising:a first resistance;a first capacitor; anda parallel circuit of a second resistance and a second capacitor,wherein one end of the first resistance is connected to an output side of the amplifier, one end of the first capacitor and one end of the parallel circuit are ...

INVERTER TYPE POWER AMPLIFIER

The present disclosure relates to an inverter type power amplifier. An exemplary embodiment of the present disclosure provides an inverter type power amplifier including: a first transistor including a gate to which an AC type of input signal is applied through an input port, a first terminal connected a power source voltage, and a second terminal connected to an output port; a second transistor including a gate through which the input signal is applied thereto, a first terminal connected to a ground, and a second terminal connected to the output port; a feedback resistor including a first terminal connected to the input port and a second terminal connected to the output port; and an AC blocking block including a first terminal connected to the output port and a second terminal connected to a DC output port. 1. An inverter type power amplifier comprising:a first transistor including a gate to which an AC type of input signal is applied through an input port, a first terminal connected a power source voltage, and a second terminal connected to an output port;a second transistor including a gate through which the input signal is applied thereto, a first terminal connected to a ground, and a second terminal connected to the output port;a feedback resistor including a first terminal connected to the input port and a second terminal connected to the output port; andan AC blocking block including a first terminal connected to the output port and a second terminal connected to a DC output port.2. The inverter type power amplifier of claim 1 ,wherein the output port is connected a DC blocking block.3. The inverter type power amplifier of claim 1 ,wherein the AC blocking block is connected to a gate of a third transistor through the DC output port.4. The inverter type power amplifier of claim 1 ,wherein the inverter type power amplifiers are connected in series in two or more stages.5. The inverter type power amplifier of claim 1 ,wherein the AC blocking block is formed of a ...

METHOD AND APPARATUS FOR GAIN ENHANCEMENT OF DIFFERENTIAL AMPLIFIER

A differential amplifier circuit and method having a feed-in network coupling an input signal to an intermediate signal. An amplifier amplifies the intermediate signal by a gain factor to output an output signal to a load network. A feedback network configured in a negative feedback topology and couples the output signal to the intermediate signal. A gain enhancing network is configured in a positive feedback topology and couples the output signal to the intermediate signal. Preferably, an impedance of the gain enhancing network is approximately equal to an impedance of a parallel connection of the feed-in network and the feedback network times the gain factor minus one. 1. A circuit comprising:a feed-in network coupling an input signal to an intermediate signal;an amplifier amplifying the intermediate signal by a gain factor to output an output signal to a load network;a feedback network configured in a negative feedback topology coupling the output signal to the intermediate signal; anda gain enhancing network configured in a positive feedback topology coupling the output signal to the intermediate signal, wherein an impedance of the gain enhancing network is approximately equal to an impedance of a parallel connection of the feed-in network and the feedback network times the gain factor minus one.2. The circuit of claim 1 , wherein the feed-in network comprises a resistor of a feed-in impedance and the feedback network comprises a feedback capacitor.3. The circuit of claim 2 , wherein the gain enhancing network comprises a resistor of a resistance that is approximately equal to the feed-in resistance times the gain factor minus one.4. The circuit of claim 1 , wherein the circuit further comprises a feedforward network coupling the input signal to the output signal.5. The circuit of claim 4 , wherein an impedance of the feedforward network is approximately equal to a sum of the impedance of a feed-in impedance and an impedance of the feedback network.6. A method ...

APPARATUS AND METHODS FOR EQUALIZATION

Apparatus and methods for equalization are provided. In certain implementations, an equalizer includes first and second feedback resistors, first and second equalization resistors, an equalization capacitor, and an amplification circuit that includes first to fourth input terminals and first and second output terminals. The amplification circuit can receive a differential input voltage signal between the first and third input terminals, and the first and second equalization resistors and the equalization capacitor are electrically connected in series between the second and fourth input terminals with the equalization capacitor between the first and second equalization resistors. Additionally, the first feedback resistor is electrically connected between the first output terminal and the second input terminal, and the second feedback resistor is electrically connected between the second output terminal and the fourth input terminal. 1. An equalizer , comprising:an amplification circuit including a first input terminal, a second input terminal, a third input terminal, a fourth input terminal, a first output terminal, and a second output terminal, wherein the amplification circuit is configured to receive a differential input signal between the first and third input terminals and to generate a differential output signal between the first and second output terminals, wherein the amplification circuit is configured to control a voltage of the first output terminal based on a voltage difference between the first and second input terminals, and wherein the amplification circuit is further configured to control a voltage of the second output terminal based on a voltage difference between the third and fourth input terminals;a first feedback resistor electrically connected between the first output terminal and the second input terminal of the amplification circuit;a second feedback resistor electrically connected between the second output terminal and the fourth input ...

DEGENERATED TRANSIMPEDANCE AMPLIFIER WITH WIRE-BONDED PHOTODIODE FOR REDUCING GROUP DELAY DISTORTION

An integrated circuit includes a degeneration network configured to improve group delay across one or more variations, wherein the degeneration network includes a transimpedance amplifier with one or more degeneration inductors. The transimpedance amplifier further includes one or more transistors, and the one or more degeneration inductors are connected after at least one emitter of the one or more transistors. 1. An integrated circuit comprising:a degeneration network configured to improve group delay across one or more variations; one or more degeneration inductors; and', 'a transimpedance amplifier including the one or more degeneration inductors., 'wherein the degeneration network comprises2. The integrated circuit according to claim 1 , wherein the transimpedance amplifier includes one or more transistors claim 1 , and the one or more degeneration inductors are connected after at least one emitter of the one or more transistors.3. The integrated circuit according to claim 1 , wherein the transimpedance amplifier includes at least two transistors claim 1 , and the one or more degeneration inductors are connected between emitters of each of the at least two transistors.4. The integrated circuit according to claim 1 , wherein:the transimpedance amplifier includes at least two transistors;a first one of the one or more degeneration inductors is connected to an emitter of a first one of the at least two transistors; anda second one of the one or more degeneration inductors is connected to an emitter of a second one of the at least two transistors.5. The integrated circuit according to claim 1 , wherein the transimpedance amplifier further comprises at least one damping resistor.6. The integrated circuit according to claim 1 , wherein improving the group delay comprises flattening a group delay profile over a frequency range claim 1 , wherein the group delay profile corresponds to at least one inductance of the one or more degeneration inductors.7. The integrated ...

SUPPRESSION CIRCUIT FOR SUPPRESSING UNWANTED TRANSMITTER OUTPUT

Aspects of the disclosure relate to a frequency suppression circuit arrangement, which allows at least one selected frequency band to be suppressed by coupling the frequency suppression circuit between the input and output of an RF power amplifier. The frequency circuit in the embodiments of the disclosure down-converts a feedback signal derived from the amplified output signal into baseband signals. Each of the baseband signals is fed into an inverting amplifier to generate a negative baseband signal. The negative baseband signal is subsequently filtered to selectively pass the negative baseband signal. The filtered signal is subsequently up-converted into an RF signal. The up-converted RF signal is combined and provided to a coupler connected at the input of the power amplifier such that when the input signal is amplified by the RF power amplifier any signals at the selected frequency can be suppressed. 1. A suppression circuit for suppressing unwanted output from an amplifier having an input and an output , the input receiving an input signal , and the amplifier operable over a frequency band and operable to amplify the input signal to produce an amplified output signal , the suppression circuit connected between the input of the amplifier and the output of the amplifier , the suppression circuit comprising:a signal coupler coupled to the output of the amplifier, and arranged to provide a feedback signal derived from the amplified output signal;a signal processing circuit arranged to receive the feedback signal, and configured to process the feedback signal to generate a negative feedback signal at a selected frequency within the frequency band of the amplifier; anda further signal coupler coupled to the input of the amplifier, and arranged to receive the input signal and the negative feedback signal, and arranged to couple the negative feedback signal to the input signal, such that when the input signal is amplified by the amplifier any signals at the selected ...

NONLINEAR CLASS AB INPUT STAGE

A circuit includes a differential input stage amplifier that receives a differential input voltage and generates an output voltage based on a difference in the differential input voltage. A feedback loop provides feedback from an output of the differential input stage amplifier to input tail current of the differential input stage amplifier. The feedback loop enables class AB operation of the differential input stage amplifier. At least one gain reducer is operatively coupled to the feedback loop to reduce the gain of the feedback loop. The gain reducer has a resistance value that varies inversely proportional to loop current in the feedback loop to reduce the gain of the feedback loop as loop current increases. 1. A circuit comprising:a differential input stage amplifier that receives a differential input voltage and generates an output voltage based on a difference in the differential input voltage;a feedback loop to provide feedback from an output of the differential input stage amplifier to input tail current of the differential input stage amplifier, wherein the feedback loop enables class AB operation of the differential input stage amplifier; andat least one gain reducer operatively coupled to the feedback loop to reduce the gain of the feedback loop, wherein the gain reducer has a resistance value that varies inversely proportional to loop current in the feedback loop to reduce the gain of the feedback loop as loop current increases.2. The circuit of claim 1 , wherein the feedback loop includes a negative feedback loop to provide feedback from an output of the differential input stage amplifier to input tail current of the differential input stage amplifier.3. The circuit of claim 2 , wherein the feedback loop includes a positive feedback loop to provide feedback from an output of the differential input stage amplifier to input tail current of the differential input stage amplifier claim 2 , wherein the positive feedback loop reduces an amount of ...

APPARATUS AND METHOD FOR TRANSIMPEDANCE AMPLIFIERS WITH WIDE INPUT CURRENT RANGES

Improved preamplifier circuits for converting single-ended input current signals to differential output voltage signals, including first and second transimpedance amplifiers with input transistors operating according to bias currents from a biasing circuit, output transistors and adjustable feedback impedances modified using an automatic gain control circuit, as well as a reference circuit controlling the bias currents according to an on-board reference current and the single-ended input or the differential output voltage signals from the transimpedance amplifiers. 1. A preamplifier circuit for converting an input current into an output voltage , the preamplifier circuit comprising:a first transimpedance amplifier receiving an input signal representing the input current and providing a first voltage output signal;a second transimpedance amplifier matched to the first transimpedance amplifier and providing a second voltage output signal;a biasing circuit providing first and second biasing currents to the respective first and second transimpedance amplifiers at least partially according to a reference current;a reference circuit controlling the reference current provided to the biasing circuit at least partially according to an offset signal; andan offset circuit providing the offset signal to the reference circuit according to a differential voltage output signal derived from the first and second voltage output signals.2. The preamplifier circuit of claim 1 , further comprising a DC cancellation circuit to selectively remove at least a portion of a DC component of the input signal according to the offset signal.3. The preamplifier circuit of claim 1 , further comprising an automatic gain control circuit controlling gains of the first and second transimpedance amplifiers at least partially according to the differential voltage output signal derived from the first and second voltage output signals.4. The preamplifier circuit of : a first input transistor including a ...

DYNAMIC STABILITY CONTROL IN AMPLIFIER DRIVING HIGH Q LOAD

A dynamically stabilizable amplifier drives an output current into an RLC load. A driver stage generates the output current, and a control circuit compares a current level of the amplifier output with a threshold and selectively enables a stabilizing resistor (to selectively shunt the load or dampen in series with the load, depending on RLC load type) at the driver stage output based on the comparison so that the amplifier is stable across a range of the output current level. The control circuit disables the resistor when the output current is above the highest threshold and enables it when below. The control circuit may control the resistor to have one of multiple resistance values based on a comparison with multiple thresholds. The output current level may be determined by replicating the output current level or by an input current level that sets the output current level independent of the load. 1. A dynamically stabilizable amplifier for driving an output current into a resistive , inductive , and capacitive (RLC) load , comprising:a driver stage that generates the output current on an output;a stabilizing resistor at the output of the driver stage; and determines a level of the output current of the amplifier;', 'compares the output current level with one or more thresholds; and', 'selectively enables the stabilizing resistor based on the comparison so that the amplifier is stable across a range of the output current level., 'a control circuit that2. The amplifier of claim 1 ,wherein the RLC load comprises a load resistance in series with a load inductance, which are in parallel with a load capacitance;wherein the stabilizing resistor is a shunt resistor; andwherein to selectively enable the stabilizing resistor based on the comparison, the control circuit controls the shunt resistor to selectively shunt the RLC load based on the comparison so that the amplifier is stable across a range of the output current level.3. The amplifier of claim 1 ,wherein the RLC ...

Haptic effects broadcasting during a group event

A system that generates haptic effects on mobile devices during a group event receives an identity of a first type of haptic effect to be broadcast during the group event and determines a first set of the mobile devices during the group event that will generate the haptic effect. The system then broadcasts the first type of haptic effect to the first set of mobile devices during the group event.

AMPLIFIER CIRCUIT HAVING POLY RESISTOR WITH BIASED DEPLETION REGION

The present invention provides an amplifier circuit, wherein the amplifier circuit includes an operational amplifier and a feedback path. The operational amplifier has an input terminal and an output terminal, and is arranged for receiving an input signal to generate an output signal. The feedback path is coupled between the input terminal and the output terminal of the operational amplifier, wherein the feedback path comprises at least two poly resistors, and a depletion region of at least one of the two poly resistors is biased by the output signal generated by the operational amplifier. 1. An amplifier circuit , comprising:an operational amplifier having an input terminal and an output terminal, for receiving an input signal to generate an output signal;a feedback path coupled between the input terminal and the output terminal of the operational amplifier, wherein the feedback path comprises at least two poly resistors, and a depletion region of at least one of the two poly resistors is biased by the output signal generated by the operational amplifier.2. The amplifier circuit of claim 1 , wherein the operational amplifier generates the output signal to a conductive layer to directly bias the depletion region of the at least one of the two poly resistors claim 1 , wherein the conductive layer is isolated from the poly resistors.3. The amplifier circuit of claim 1 , wherein a depletion region of the other one of the two poly resistors is biased by a fixed voltage.4. The amplifier circuit of claim 3 , wherein the two poly resistors are connected in series.5. The amplifier circuit of claim 4 , wherein the at least one of the poly resistors is coupled to the output terminal of the operational amplifier claim 4 , and the other one of the two poly resistors is coupled to the input terminal of the operational amplifier.6. The amplifier circuit of claim 1 , wherein a depletion region of the other one of the two poly resistors is floating.7. The amplifier circuit of claim ...

TRANS-IMPEDANCE AMPLIFIER WITH INCREASED DYNAMIC RANGE

A wide dynamic range trans-impedance amplifier includes a first trans-impedance amplifier configured to receive a first input current and produce a first voltage as a function of the first input current, and a second trans-impedance amplifier configured to receive a second input current and produce a second voltage as a function of the second input current. A current steering element causes a first portion of current from a current source to flow to the first trans-impedance amplifier until the first current portion reaches the first threshold current, and causes a second portion of current from the current source to flow to the second trans-impedance amplifier, until the second current portion reaches the second threshold current. The second current portion is current from the current source that exceeds the first threshold current. The wide dynamic range trans-impedance amplifier may receive, for example, ion collector current from a hot cathode ionization gauge (HCIG). 1. A wide dynamic range trans-impedance amplifier , comprising:a first trans-impedance amplifier configured to receive a first input current and produce a first voltage being a function of the first input current, the first trans-impedance amplifier characterized by a first saturation current at which the first trans-impedance amplifier ceases to produce the first voltage as a linear function of the first input current, and the first trans-impedance amplifier having a first gain characteristic;a second trans-impedance amplifier configured to receive a second input current and produce a second voltage being a function of the second input current, the second trans-impedance amplifier characterized by a second saturation current at which the second trans-impedance amplifier ceases to produce the second voltage as a linear function of the second input current, and the second trans-impedance amplifier having a second gain characteristic; and cause the first input current to flow from a current source to ...

Power amplifying circuit

Amplifier

一种可调节信号且可编程的增益放大器

本发明提供了一种可调节信号且可编程的增益放大器，采用PGA电路，包括：运算放大电路、输入端、输出端、第一反馈电容、第二反馈电容、第一开关和第二开关；其中，第一反馈电容跨接在输出端和运算放大电路的反向输入端之间，第二反馈电容的一端连接运算放大器的反向输入端，另一端通过第一开关和第二开关分别连接输出端和参考电压。本发明减少了电容的使用数量，节省了面积；减少了输入电压数量，简化了电路设计，同时减小了面积、功耗和噪声；增大了PGA电路的反馈系数，减轻了运放的设计难度，同时减小了功耗；可配置成传统的只有放大功能的PGA电路，更加灵活。

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Amplifier

Attenuated feedback type differential amplifier

차동증폭기는 입력 신호(V in , V in )를 받는 입력단(1)과 출력신호(V out , V out )를 발생하는 출력단(2)과, 출력신호를 감쇄시키고 감쇄신호를 다시 입력단으로 이송시키는 감쇄회로(3)를 구비한다. 입력단은, 공통적으로 전류원(I 1 )에 연결되고 각각 두 개의 부하 증폭기(Q 3 , R 1 , Q 4 , R 2 )에 연결된 2개의 트랜지스터(Q 1 , Q 2 )에 의해 형성된 전류 스위치를 포함한다. 부하 증폭기는 감쇄신호에 의해 실질적으로 두 트랜지스터의 증폭률을 감소시키도록 제어된다. The differential amplifier has an input stage (1) receiving input signals (V in , V in ), an output stage (2) generating output signals (V out , V out ), and attenuating the output signal and transferring the attenuation signal back to the input stage. An attenuation circuit 3 is provided. The input stage comprises a current switch formed by two transistors (Q 1 , Q 2 ) commonly connected to a current source (I 1 ) and each connected to two load amplifiers (Q 3 , R 1 , Q 4 , R 2 ). do. The load amplifier is controlled to substantially reduce the amplification factor of the two transistors by the attenuation signal.

Amplifier circuit

본 발명은 오프셋 보상 기능을 구비하는 증폭 회로에 관한 것으로, 저전압 전원 구동의 오디오 기기에 적합한 증폭 회로에 관한 것이다. BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an amplifier circuit having an offset compensation function, and more particularly to an amplifier circuit suitable for low voltage power supply driven audio equipment. 본 발명은 부귀환 접속되는 증폭기와, 이 증폭기의 출력 단자에 일단이 접속되는 저항과 기준 전위에 일단이 접속되는 저항으로 구성되는 직렬 회로, 및 1쌍의 비교 입력 단자가 상기 직렬 회로의 콘덴서와 저항의 콘덴서와의 접속점 및 기준 전위에 각각 접속되고, 출력 단자가 상기 증폭기의 입력 단자에 접속되는 비교기로 구성된다. The present invention comprises a series circuit composed of an amplifier connected to the negative feedback, a resistor connected at one end to an output terminal of the amplifier, and a resistor connected at one end to a reference potential, and a pair of comparison input terminals includes a capacitor of the series circuit. And a comparator connected to the connection point of the resistor and the reference potential, respectively, and the output terminal of which is connected to the input terminal of the amplifier.

Distortion rejector

Pre-post compensation amplifier

본 발명은 전치-후치 보정 증폭기(10)에 관한 것이다. 본 발명의 장치는 2개의 드라이버 증폭기(12, 14) 및 2개의 전력 증폭기(16, 18)를 포함하는 4-캐스케이드 증폭기를 구비한다. 전치-후치 보상 증폭기(10)는 적어도 2개의 RF 신호가 전치-후치 증폭기 내에서 입력 신호를 전파함으로써 유도된 왜곡 신호에 대해 거의 완전히 보상되어 증폭할 수 있다. 각 쌍의 드라이버-전력 증폭기는 최적의 결과를 달성하기 위해 전력 출력에 있어서 하향 스케일링된다. The present invention relates to a pre-post correction amplifier 10. The apparatus of the present invention has a four-cascade amplifier comprising two driver amplifiers 12, 14 and two power amplifiers 16, 18. The pre-post compensation amplifier 10 can amplify nearly fully compensated for the distortion signal induced by at least two RF signals propagating the input signal within the pre-post amplifier. Each pair of driver-power amplifiers is scaled down in power output to achieve optimal results.

Transistor power amplifier

(57)【要約】 【課題】 実効利得制御電圧範囲が広い電力増幅器を提 供する。 【解決手段】 電力増幅用トランジスＴr11のベースと 利得制御電源Ｖbbとをバイアス抵抗Ｒ13を介して接続す る。このようにして、ベース駆動用トランジスＴr12が オンするまでは、バイアス抵抗Ｒ13を介して、利得制御 電源Ｖbbから電力増幅用トランジスタＴr11をベース駆 動用トランジスタＴr12を介さずに直接バイアスするこ とによって、実効利得制御電圧範囲をベース駆動用トラ ンジスタＴr12のベース−エミッタ間オン電圧分だけ拡 大する。

Amplifier

Negative feedback amplifier

Feedback amplifier

Non-inverting voltage repeater

FIELD: electronics. SUBSTANCE: invention relates to circuitry, automation, industrial electronics and instrumentation. It can be used, in particular, in the form of buffer (decoupling) cascades and matching devices. Engineering problem is solved by that a non-inverting voltage repeater containing an operating amplifier is introduced with a set of four additional elements and the elements connection is changed, additional first and second resistors are interconnected in series, free terminal of the first of them is connected to the output of the existing operating amplifier, and free terminal of the second one is grounded, additional capacitor is connected parallel to the first additional resistor, common output of the first, the second additional resistors and the additional capacitor is connected to the non-inverting input of the additional operating amplifier, its output is connected to its inverting input, and also forms the output of the non-inverting voltage repeater relative to the grounding, common output of the inverting input and the output of the additional operating amplifier is connected to the non-inverting input of the existing operating amplifier. EFFECT: technical result is higher accuracy of voltage transfer. 1 cl, 1 dwg РОССИЙСКАЯ ФЕДЕРАЦИЯ (19) RU (11) (13) 2 604 879 C9 (51) МПК H03F 1/34 (2006.01) ФЕДЕРАЛЬНАЯ СЛУЖБА ПО ИНТЕЛЛЕКТУАЛЬНОЙ СОБСТВЕННОСТИ (12) СКОРРЕКТИРОВАННОЕ ОПИСАНИЕ ИЗОБРЕТЕНИЯ К ПАТЕНТУ Примечание: библиография отражает состояние при переиздании (21)(22) Заявка: 2015142892, 09.10.2015 (24) Дата начала отсчета срока действия патента: 09.10.2015 (72) Автор(ы): Передельский Геннадий Иванович (RU) Приоритет(ы): (22) Дата подачи заявки: 09.10.2015 (45) Опубликовано: 20.12.2016 R U (73) Патентообладатель(и): Федеральное государственное бюджетное образовательное учреждение высшего образования "Юго-Западный государственный университет" (ФГБОУВО ЮЗГУ) (RU) (15) Информация о коррекции: (48) Коррекция опубликована: U1, 27.01.2000. US 5323122 ...

Feedback amplifier device

High input impedance transistor amplifier

POWER LOADING LOOP, RADIO FREQUENCY SIGNAL AMPLIFICATION CIRCUIT AND RADIO FREQUENCY SIGNAL TRANSMITTER EQUIPPED WITH SUCH CIRCUIT

TV transmitter

Transistor amplifier

Improvements to amplifiers

Reverse Coupled Amplifier

Improvements to electronic tube assemblies

Improvements to stabilized transistron amplifiers

Advanced transistor amplifier

Advanced radio station

POWER AMPLIFIER CIRCUIT

Amplifier

Patent FR2232140B1

Push-pull amplifier

Transistor amplifier circuits

Improvements to devices responding to excitation

Signal-adjustable programmable gain amplifier

本发明提供了一种可调节信号且可编程的增益放大器，采用PGA电路，包括：运算放大电路、输入端、输出端、第一反馈电容、第二反馈电容、第一开关和第二开关；其中，第一反馈电容跨接在输出端和运算放大电路的反向输入端之间，第二反馈电容的一端连接运算放大器的反向输入端，另一端通过第一开关和第二开关分别连接输出端和参考电压。本发明减少了电容的使用数量，节省了面积；减少了输入电压数量，简化了电路设计，同时减小了面积、功耗和噪声；增大了PGA电路的反馈系数，减轻了运放的设计难度，同时减小了功耗；可配置成传统的只有放大功能的PGA电路，更加灵活。

Amplifier assembly

Amplifier assembly

Linear feedback amplifier

Low frequency transistor amplifier

POWER SERVO LOOP, RADIO FREQUENCY SIGNAL AMPLIFICATION CIRCUIT, AND RADIO FREQUENCY SIGNAL TRANSMITTER PROVIDED WITH SUCH A CIRCUIT

La présente invention concerne une boucle d'asservissement en puissance, pour commander un amplificateur de puissance notamment, comprenant un circuit de détection (100) comportant des moyens de couplage (1) pour prélever des signaux radiofréquences, un bloc de détection (400) pour délivrer un signal de détection (Vdet) partiellement représentatif d'un premier signal radiofréquence prélevé par les moyens de couplage. Le circuit de détection selon l'invention comprend, entre les moyens de couplage et le bloc de détection, des moyens de contrôle de détection (21, 22, 4) pour supprimer sensiblement un deuxième signal radiofréquence dit signal parasite prélevé par les moyens de couplage de sorte que le signal de détection est totalement représentatif du premier signal radiofréquence. The present invention relates to a power control loop, for controlling a power amplifier in particular, comprising a detection circuit (100) comprising coupling means (1) for sampling radiofrequency signals, a detection block (400) for delivering a detection signal (Vdet) partially representative of a first radiofrequency signal picked up by the coupling means. The detection circuit according to the invention comprises, between the coupling means and the detection unit, detection control means (21, 22, 4) for substantially eliminating a second radiofrequency signal known as the parasitic signal picked up by the coupling means. so that the detection signal is fully representative of the first radiofrequency signal.

Improvements to amplifier coupling circuits

Direct-coupled transistor amplifier with high input impedance

Transistor amplifiers

Feedback circuit

PERFECTED DIFFERENTIAL AMPLIFIER

Low frequency resistance amplifier

Ring modulator phase comparator

Improvements in or relating to noise reducing arrangements for discharge tube amplifiers

554,371. Thermionic valves and circuits therefor. PHILIPS LAMPS, Ltd. (Naamlooze Vennootschap Philips' Gloeilampenfabrieken). June 6. 1941, No. 7199. Drawings to Specification. [Classes 39 (i) and 40 (v)] The subject-matter of this Specification is described in Specifications 645,936, 645,989 and 645,990, [all in Group XL (c)]. Reference has been directed by the Comptroller to Specifications 27768/39 (as open to inspection under Sect. 91), 478,194, 534,104 and 537,900.

Power amplifier

Power amplification circuit

(57)【要約】本公報は電子出願前の出願データであるた め要約のデータは記録されません。

Amplifier circuit

Amplifier circuit

Amplifier circuit having feedback circuit

An amplifier circuit includes a high-gain amplifier, and a feedback circuit for extracting an unstable output having a level equal to or less than a threshold level from an amplified signal from the amplifier and for feeding back the unstable signal to the amplifier, so that the amplifier oscillates at a predetermined oscillation frequency. The amplifier circuit also includes a band rejection filter for passing signal components of the amplified signal other than an oscillation output which is obtained at the output terminal of the amplifier when the amplifier oscillates at the predetermined oscillation frequency. The signal components obtained from the band rejection filter are an output signal of the amplifier circuit.

Two-stage transistor feedback amplifier

Patent FR2426360B1

Amplifier circuit

Negative feedback amplifiers

Mu-beta measurement in feedback systems

Thermionic amplifier

Attenuated feedback type differential amplifier

A differential amplifier includes an input stage for receiving input signals, an output stage for generating output signals, and an attenuating circuit for attenuating the output signals and feeding attenuation signals back to the input stage. The input stage includes a current switch formed by two transistors connected commonly to a current source and each connected to two load amplifiers. The load amplifiers are controlled by the attenuation signal, to substantially reduce the amplification of the two transistors.

BALANCER AMPLIFIER

Cet amplificateur est formé à partir d'une paire de transistors montés en amplificateur différentiel Grâce à un réseau de contre-réaction, il est possible de symétriser des signaux de fort niveau. Application : cet amplificateur permet d'obtenir des signaux en opposition de phase. This amplifier is formed from a pair of transistors mounted as a differential amplifier. Thanks to a feedback network, it is possible to symmetrize high level signals. Application: this amplifier makes it possible to obtain signals in phase opposition.

DC amplifier

Amplifier with transistorized push-pull output stage

Improvements in or relating to electrical amplifiers

584,475. Valve amplifying circuits. STANDARD TELEPHONES & CABLES, Ltd., and MORTLOCK, A. Nov. 28, 1944, No. 23729. [Class 40 (v)] An amplifier having a forward path, whose gain increases with frequency, is provided with feedback path including a cathode follower, and means to vary the gain of the feedback stage, so that the overall gain of the system at low frequencies approximates to that of the forward path, but tends to a constant value at high frequencies, the turning point varying with the frequency applied. As described the forward amplifier has two stages, coupled by the R.C. network 7, and the output is taken through network 8. The feedback path is coupled to the output terminals by the network 24, 25, 26 and comprises a variable-mu valve 18, with a potentiometer 19 partially shunted by a relatively low resistance 20 as load in its cathode circuit. The output of the valve 18 is applied through the network 21, 22, 23 to the bias resistance 11 in the cathode circuit of the valve 5. The desired characteristic. is obtained by biassing valve 18 in accordance with the log of the incoming frequency by means of a device 28 supplied with a variable frequency input which may be the frequency to be amplified. A device of this type .is described in 583,752, [Group XXXVI].

Power amplification circuit and communication device using the same

A power amplification circuit, and a communication device using the same, which are capable of suppressing gain decreases of a power amplifier due to increases in input signal power in a state near the saturation operation, capable of reducing its size, and low in distortion and high in efficiency. The power amplification circuit includes a power amplifier and a negative feedback circuit connected between a signal input terminal and a signal output terminal of the power amplifier. Impedance of the negative feedback circuit depends on a signal voltage occurring across the negative feedback circuit. By adjusting the characteristic that the negative feedback quantity of the negative feedback circuit to the power amplifier is variable depending on input signal power, gain fluctuations of the power amplifier due to increases or decreases of input signal power or output signal power around a specified output signal power are suppressed.

Pre-post distortion amplifier

The pre-post distortion amplifier (10) is disclosed. The device comprises the four-cascade amplifier comprising two driver amplifiers (12) and (14) and two power amplifiers (16) and (18). The pre-post distortion amplifier (10) allows one to amplify at least two RF signals with almost full compensation of the distortion signal introduced by the propagation of input signals within the pre-post distortion amplifier. Each pair of driver-power amplifiers is scaled down in power output to achieve the optimum result.

High input impedance transistor amplifier circuits

Non-inverting voltage repeater

Изобретение относится к схемотехнике, автоматике, промышленной электронике и измерительной технике. Оно может быть использовано, в частности, в виде буферных (развязывающих) каскадов и согласующих устройств. Техническая задача решается посредством того, что в неинвертирующий повторитель напряжения, содержащий операционный усилитель, введена совокупность четырех дополнительных элементов и изменено включение элементов, дополнительные первый и второй резисторы включены между собой последовательно, свободный вывод первого из них подключен к выводу имеющегося операционного усилителя, а свободный вывод второго заземлен, дополнительный конденсатор включен параллельно первому дополнительному резистору, общий вывод первого, второго дополнительных резисторов и дополнительного конденсатора соединен с неинвертирующим входом дополнительного операционного усилителя, его выход соединен с его инвертирующим входом, а также образует выход неинвертирующего повторителя напряжения относительно «земли», общий вывод инвертирующего входа и выхода дополнительного операционного усилителя соединен с неинвертирующим входом имеющегося операционного усилителя. Технический результат - повышение точности передачи напряжения. 1 ил. РОССИЙСКАЯ ФЕДЕРАЦИЯ (19) RU (11) (51) МПК H03F 1/34 (13) 2 604 879 C1 (2006.01) ФЕДЕРАЛЬНАЯ СЛУЖБА ПО ИНТЕЛЛЕКТУАЛЬНОЙ СОБСТВЕННОСТИ (12) ОПИСАНИЕ (21)(22) Заявка: ИЗОБРЕТЕНИЯ К ПАТЕНТУ 2015142892/07, 09.10.2015 (24) Дата начала отсчета срока действия патента: 09.10.2015 (72) Автор(ы): Передельский Геннадий Иванович (RU) Приоритет(ы): (22) Дата подачи заявки: 09.10.2015 (45) Опубликовано: 20.12.2016 Бюл. № 35 2 6 0 4 8 7 9 R U (54) НЕИНВЕРТИРУЮЩИЙ ПОВТОРИТЕЛЬ НАПРЯЖЕНИЯ (57) Реферат: Изобретение относится к схемотехнике, конденсатора соединен с неинвертирующим автоматике, промышленной электронике и входом дополнительного операционного измерительной технике. Оно может быть усилителя, его выход соединен с его использовано, в частности, в виде буферных инвертирующим входом ...

Ultra linear amplifiers

Linear transmitter training method and apparatus

A linear transmitter having both an open loop and a closed loop training mode capability functions to schedule and facilitate these training modes in a manner that reduces adjacent channel splatter. A training waveform can be utilized to enhance these operational objectives. Scheduling of the open loop and closed loop training modes can be ordered, in a TDM system, in a variety of ways.

Feedback-type amplifier circuit

Amplification installation

Sensor circuit

본 발명은 센서 회로를 제공한다. 상기 센서 회로는 측정 신호를 입력단으로 입력받아 증폭하여 제1 출력단으로 출력하는 제1 증폭기, 제1 증폭기의 자체 입력 저항(Ri)으로 흐르는 전류(Ir)를 제공하는 제1 전류원, 제1 증폭기의 자체 입력 정전용량(Ci)으로 흐르는 전류(Ic)를 제공하는 제2 전류원, 및 제1 증폭기의 출력에 나타나는 직류 오프셋 전압을 감소시키는 바이어스 전류원을 포함한다. The present invention provides a sensor circuit. The sensor circuit may include a first amplifier that receives a measurement signal at an input terminal, amplifies the output signal, and outputs the current Ir flowing to its own input resistance Ri of the first amplifier. A second current source providing a current Ic flowing into its own input capacitance Ci, and a bias current source reducing a direct current offset voltage appearing at the output of the first amplifier. 비접촉 센서, 전위 센서, 생체 신호 증폭기, 고입력 임피던스, 저입력 커패시턴스 Contactless sensors, potential sensors, biosignal amplifiers, high input impedance, low input capacitance

Amplifier and frequency converter

An amplifier circuit (15) amplifies a differential signal supplied by a pair of input terminals ({P1+, P1-}). A phase controller circuit (25) is placed between the emitters of bipolar transistors (101a, 101b) and the ground. A feedback circuit (35) is placed across the input and the output of the amplifier circuit (15) for feeding the output of the amplifier circuit (15) back to the input thereof. A phase change amount in the amplifier circuit (15) is determined by the values of inductors (201a, 201b), whereas a phase change amount in the feedback circuit (35) is determined by the values of resistances (301a, 301b) and capacitors (302a, 302b). The values of these devices are selected so that a phase difference between an input signal and a feedback signal is approximately 180 degrees in a range from the frequency of a fundamental wave of the input signal to the frequency of a second harmonic thereof.

Electrical amplifier circuit

Improvements in means and method for controlling or preventing oscillations in vacuum tube circuits

241,185. Thompson Manufacturing Co., R. E., (Assignees of Phelps, B.). Oct. 30, 1924, [Convention date]. Thermionic amplifiers and detectors. -To counteract the back-coupling set up across the internal electrodes of a valve amplifier, advantage is taken of the opposing potentials developed across a pure ohmic resistance or an inductive reactance inserted between the high and low tension batteries, i.e. in a part of the circuit common to both the input and output paths. As shown in Fig. 1, the potential gradient across the resistance 13 between the fixed connection to the filament battery and the adjustable grid-tapping increases as the plate current increases. The corresponding drop in grid potential therefore curbs the plate current and tends to oppose the conditions leading to self-oscillation. In Fig. 3, the resistances 18<1> and 19<1> serve a similar purpose with regard to the high-frequency amplifiers 14<1>, 15<1>. Here however the direct-current supply to the plates flows through chokes 25, 26, and does not impress any steady bias upon the grid, whilst the radio frequencies pass through the condensers 29, 30 and resistances 18<1>, 19<1>, and impart transient voltage variations which check the tendency to self-oscillation. In Fig. 4 the curbing back-voltage across the stabilizing resistance 33 is derived from the grid current flowing in the detector valve 37 instead of from the plate current as before. The windings of the intervalve coupling transformer 34 are adjusted to give the _proper neutralizing direction of flow in the resistance 33. A reflex circuit is also described in which two stages of combined high and low frequency amplification are employed, the plate current from the second valve being passed through a single curbing resistance inserted in the grid circuit of the first but serving to stabilize both valves. Specification 172,758 and 220,727 are referred to.

Methods and systems for stabilizing an amplifier

The invention generally relates to stabilizing an amplifier. In one aspect, a stabilization module that is in electrical communication with the amplifier is provided. The stabilization module includes both an open loop control system and a closed loop control system. The open loop control system is used to modify at least one characteristic of an input signal received by the stabilization module and to pass control to the closed loop control system. The closed loop control system is then used to modify the at least one characteristic of the input signal. The modified input signal is provided to the amplifier.

Electric wave amplifying system

Active resistor used in a feedback amplifier particularly useful for proximity communication

An active resistor and its use in a negative feedback amplifier allow wide voltage swings on the input and output signals. One embodiment includes parallel pass-gate MOS transistors of opposite conductivity types connected between the input and output nodes. Bootstrapping transistors are connected between the gates of the pass-gate transistors and respective bias voltages. Coupling capacitors are connected between the gates and the output node. Additional coupling capacitors may be connected between the gates and the input node to make the resistor symmetric. In other embodiments, only one pass-gate transistor is used.

Method of operating photoelectric devices

Ac voltage signal amplivying arrangement

1420115 Amplifiers PERKIN-ELMER CORP 19 July 1973 [24 July 1972] 34490/73 Heading H3T An arrangement for amplifying an A.C. voltage signal comprises a transformer 15, a differential amplifier 14 having two input terminals with a feedback connection to the negative input from a feedback winding 18 for reducing a D.C. offset voltage applied to the transformer by the amplifier when the voltage gain is other than unity. In the embodiment, the signal input to the amplifier is derived from a digital to analogue converter 13 fed with A.C. from source 11 via step-down transformer 12. In an alternative arrangement the separate feedback winding is omitted, the negative feedback path being connected to a tap on the primary winding of the output transformer (Fig. 2, not shown). The arrangement includes D.C. negative feedback due to the resistance of the primary winding of the transformer 15.

Electron discharge amplifier

Patent FR2299762B1

Systems for the transmission of angular motion

199,357. British Thomson-Houston Co., Ltd., (Assignees of Hildebrand, L. E.). June 16, 1922, [Convention date]. Order apparatus.-In a system for transmitting angular motion, the output of the transmitter is amplified for the operation of any desired number of receivers. The armature winding of the transmitter 10, Fig. 1, comprises three windings 14, 15, 16 connected respectively to the grid circuits of three vacuum tube amplifiers 17, 18, 19. The output circuits of the tubes are connected to the primaries 34 of transformers 31, 32, 33, the secondaries of which are connected to the receiving circuit mains 37, 38, 39. Receivers 40, 41, 42, similar to the transmitter 10, are connected to the mains 37, 38, 39. The field windings of the transmitter and receivers are supplied from singlephase mains 13. Movement of the rotor of the transmitter 10 varies the voltages induced in the armature windings and these voltages are transmitted through the tubes 17, 18, 19 to the mains 37, 38, 39. An unbalanced voltage condition is thus caused between the receivers and their supply mains, and equalizing currents are set up in the armature winding of the receivers to exert torques on their rotors and so reproduce any movement imparted to the transmitter. In the modification shown in Fig. 2, differences in the voltages of the transmitter and receivers are applied to the grid circuits of the vacuum tubes. The primary windings 53 of the pairs of transformers 50, 51, 52 are connected across the armature windings 14, 15, 16 and the primaries 54 are connected to the receiving circuit mains which are supplied by transformers 31, 32, 33. The secondaries 58, 59 of each pair of transformers are connected in series and in opposition in the grid circuit of the tubes, so that when the receivers are in angular agreement with the, transmitter no voltages are impressed on the grid circuits. In a further modifi. cation, the primaries 54, Fig. 2, are connected through conductors 55, 56, 57, Fig. 3, to ...

Audio amplifier

High frequency amplification setup