Frequency Modulators
Номер патента: GB1166008A
Опубликовано: 01-10-1969
Автор(ы):
Принадлежит: International Business Machines Corp
Опубликовано: 01-10-1969
Автор(ы):
Принадлежит: International Business Machines Corp
Реферат: 1,166,008. Frequency modulations; transistor oscillating circuits. INTERNATIONAL BUSINESS MACHINES CORP. 14 June, 1968 [6 July, 1967], No. 28320/68. Headings H3R and H3T. A frequency modulator comprises a ring oscillator having a plurality of transistor stages 11, 21, 31 interconnected in a circular fashion for sequential conduction, a common source of collector bias for the stages and control means for varying the bias as a function of an input signal. As shown an output is taken from stage 31, but it may be taken from any of the frequency-modulated stages 11, 21, 31. As shown, the collector voltage is derived from the second, 52 of two cascaded emitter followers 51, 52 to the base of the first of which is applied (1) a centre-setting bias from potentiometer 43 and (2) the modulating signal from potentiometer 42, via capacitor 44. The ring oscillator may comprise any odd number of transistor stages, together with further emitter-follower stages, the frequency of oscillation being determined by the propagation delay of the transistors.
Frequency modulator having parallel-connected phase adder and oscillator amplification elements
Номер патента: US4584542A. Автор: Seitaro Shinbara. Владелец: Tokyo Shibaura Electric Co Ltd. Дата публикации: 1986-04-22.