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Небесная энциклопедия

Космические корабли и станции, автоматические КА и методы их проектирования, бортовые комплексы управления, системы и средства жизнеобеспечения, особенности технологии производства ракетно-космических систем

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Мониторинг СМИ

Мониторинг СМИ и социальных сетей. Сканирование интернета, новостных сайтов, специализированных контентных площадок на базе мессенджеров. Гибкие настройки фильтров и первоначальных источников.

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Применить Всего найдено 15. Отображено 15.
26-04-2012 дата публикации

Broadband Tuner for Very Wide Signal Conversion

Номер: US20120099685A1
Принадлежит: Zoran Corporation

An agile RF tuner circuit capable of converting a wide portion of RF signal into an IF signal suitable for analog-to-digital conversion. The circuit up converts a received RF signal to a high IF signal and then down converts the high IF signal to a low IF signal. Embodiments of the RF circuit incorporate harmonic reject mixers to suppress harmonics and intermodulations typically associated with the frequency conversion process. 1. A method for converting a wide portion of a received RF signal into an IF signal , said method comprising:processing said RF signal in continuous fashion;frequency translating said processed RF signal to a low IF signal, said low IF signal comprising an in-phase component and a quadrature component;lowpass filtering the in-phase and quadrature components of said low IF signal;frequency translating each of said in-phase and quadrature components of said low IF signal to a high IF signal having in-phase and quadrature components;combining the frequency translated in-phase and quadrature components of said high IF signal; andfiltering said combined high IF signal to yield an output IF signal.2. The method of wherein said processing said RF signal comprises bandpass filtering said RF signal with a filter comprising a switched filter structure with analog trim.3. The method of wherein frequency translating said processed RF signal to a low IF signal is accomplished claim 1 , at least in part claim 1 , by mixing said RF signal with a plurality of harmonic reject mixers.4. The method of wherein the harmonic reject mixers operate on said RF signal to suppress harmonics associated with said harmonic reject mixers.5. The method of wherein said plurality of harmonic reject mixers comprises a first mixer stage and a second mixer stage.6. The method of wherein said first mixer stage generates said in-phase components of said low IF signal.7. The method of wherein said second mixer stage generates said quadrature component of said low IF signal.8. The ...

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26-04-2012 дата публикации

Broadband Tuner for Very Wide Signal Conversion

Номер: US20120099686A1
Принадлежит: Zoran Corporation

An agile RF tuner circuit capable of converting a wide portion of RF signal into an IF signal suitable for analog-to-digital conversion. The circuit up converts a received RF signal to a high IF signal and then down converts the high IF signal to a low IF signal. Embodiments of the RF circuit incorporate harmonic reject mixers to suppress harmonics and intermodulations typically associated with the frequency conversion process. 1. A method for converting a wide portion of a received RF signal into an IF signal , said method comprising:processing said RF signal in continuous fashion;frequency translating said processed RF signal to a low IF signal, said low IF signal comprising an in-phase component and a quadrature component, wherein frequency translating said processed RF signal to a low IF signal is accomplished, at least in part, by mixing said RF signal with a plurality of harmonic reject mixers;lowpass filtering the in-phase and quadrature components of said low IF signal; andconverting said in-phase and quadrature components to a digital signal.2. The method of further comprising frequency translating each of said in-phase and quadrature components of said low IF signal to a high IF signal having in-phase and quadrature components prior to said converting said in-phase and quadrature components to a digital signal.3. The method of wherein said processing said RF signal comprises bandpass filtering said RF signal with a filter comprising a switched filter structure with analog trim.4. The method of wherein said harmonic reject mixers operate on said RF signal to suppress harmonics associated with said harmonic reject mixers.5. The method of wherein said plurality of harmonic reject mixers comprises a first mixer stage and a second mixer stage.6. The method of wherein said first mixer stage generates said in-phase components of said low IF signal.7. The method of wherein said second mixer stage generates said quadrature component of said low IF signal.8. The ...

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31-01-2012 дата публикации

Broadband tuner for very wide signal conversion

Номер: US8107918B2
Принадлежит: Zoran Corp

An agile RF tuner circuit capable of converting a wide portion of RF signal into an IF signal suitable for analog-to-digital conversion. The circuit up converts a received RF signal to a high IF signal and then down converts the high IF signal to a low IF signal. Embodiments of the RF circuit incorporate harmonic reject mixers to suppress harmonies and intermodulations typically associated with the frequency conversion process.

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16-09-2004 дата публикации

Current driven polyphase filters and method of operation

Номер: WO2004021565A3
Принадлежит: Microtune Texas LP

A filter circuit (10) includes a polyphase filter (14) coupled to a first circuit component (12) and a second circuit component (16). The first circuit component propagates four input current signals (62, 64, 66, 68) to the polyphase filter. The third and fourth input current signals are substantially one-hundred-eighty degrees out of phase with the first and second input current signals. The polyphase filter receives the input current signals and generates four output current signals (90, 92, 94, 96) that are out of phase with each other. The second circuit component generates first and second output signals using the four output current signals. The first and second output signals are ninety degrees out of phase with each other.

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22-12-2010 дата публикации

Broadband tuner for very wide signal conversion

Номер: EP2263320A1
Принадлежит: Microtune Texas LP

An agile RF tuner circuit capable of converting a wide portion of RF signal into an IF signal suitable for analog-to-digital conversion. The circuit up converts a received RF signal to a high IF signal and then down converts the high IF signal to a low IF signal. Embodiments of the RF circuit incorporate harmonic reject mixers to suppress harmonics and intermodulations typically associated with the frequency conversion process.

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27-12-2007 дата публикации

SYSTEM AND METHOD FOR CONSTRUCTING THE INPUT SIMPEDANCE OF A STACKED AMPLIFIER ASSEMBLY

Номер: DE60313621T2
Принадлежит: Microtune Texas LP

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19-03-2004 дата публикации

System and method for establishing a bias current using a feedback loop

Номер: AU2003274932A1
Автор: Kim E. Beumer
Принадлежит: Microtune Texas LP

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15-05-2007 дата публикации

System und verfahren zum aufbau der eingangsimpedanz einer gestapelte verstärkeranordnung

Номер: ATE361582T1
Автор: Kim E Beumer
Принадлежит: Microtune Texas LP

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17-09-2008 дата публикации

System and method for providing distributed gain

Номер: EP1969719A2
Принадлежит: Microtune Texas LP

A system for filtering a signal includes a plurality of filter modules coupled in series. Each filter module includes a filter and a variable gain element. Each filter is capable of receiving an input signal, attenuating a portion of the input signal that is outside a passband . associated with the filter, and outputting at least a portion of the input signal that is within the passband associated with the filter. Each variable gain element is capable of receiving a control signal and inducing a gain in an output of the filter based on the control signal.

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05-07-2007 дата публикации

System and method for providing distributed gain

Номер: WO2007075863A2
Принадлежит: Microtune (Texas), L.P.

A system for filtering a signal includes a plurality of filter modules coupled in series. Each filter module includes a filter and a variable gain element. Each filter is capable of receiving an input signal, attenuating a portion of the input signal that is outside a passband . associated with the filter, and outputting at least a portion of the input signal that is within the passband associated with the filter. Each variable gain element is capable of receiving a control signal and inducing a gain in an output of the filter based on the control signal.

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04-03-2009 дата публикации

Agc system and method for broadband tuners

Номер: EP2030320A2
Принадлежит: Microtune Texas LP

A system for providing automatic gain control (AGC) comprises a signal path with an RF input, a plurality of power detectors in communication with the signal path, each of the power detectors operable to measure a total broadband power level of a signal in the signal path, each of the power detectors positioned to monitor a point in the signal path corresponding to a change in signal bandwidth, a control system operable to receive from each of the power detectors information associated with the power level and to adjust attenuation in the signal path in response to the information to achieve desired gain control.

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28-08-2008 дата публикации

Radio-Frequency Amplifier System

Номер: US20080204141A1
Принадлежит: Microtune Texas LP

A device for measuring voltage levels includes a root mean square (RMS) detector. The RMS detector includes a linear multiplier, a log converter, a low-pass filter and a temperature compensator. The linear multiplier multiplies a voltage of an input signal by the voltage of the input signal. The low-pass filter couples to an output of the linear multiplier. The log converter generates a logarithmic signal having a voltage that is logarithmically related to a voltage of an output of the low-pass filter. The temperature compensator adjusts the logarithmic signal based on a temperature of the RMS detector. The RMS detector is capable of determine an RMS voltage level of the input signal.

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06-12-2007 дата публикации

Agc system and method for broadband tuners

Номер: WO2007140177A2
Принадлежит: Microtune (Texas), L.P.

A system for providing automatic gain control (AGC) comprises a signal path with an RF input, a plurality of power detectors in communication with the signal path, each of the power detectors operable to measure a total broadband power level of a signal in the signal path, each of the power detectors positioned to monitor a point in the signal path corresponding to a change in signal bandwidth, a control system operable to receive from each of the power detectors information associated with the power level and to adjust attenuation in the signal path in response to the information to achieve desired gain control.

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14-04-2003 дата публикации

Linearizer for a pin diode attenuator

Номер: AU2002332000A1
Принадлежит: Microtune Texas LP

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10-04-2003 дата публикации

Linearizer for a pin diode attenuator

Номер: WO2003030355A2
Принадлежит: Microtune (Texas), L.P.

Linearizer circuitry is disclosed for providing control signal outputs to operate a controllable attenuator throughout a relatively large dynamic range while maintaining a relatively consistent return loss. Preferred embodiment linearizer circuitry provides a series control current and a shunt control current for coupling to a PIN diode attenuator, such as may be configured in a π network or a T network. Preferably, differential pairs are utilized in providing each of the control current outputs.

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