Oscillators – Relaxation oscillators
Patent
1975-10-17
1977-07-05
Griffin, Robert L.
Oscillators
Relaxation oscillators
325418, 331 8, H04B 116
Patent
active
040342980
ABSTRACT:
An FM tuner having an improved automatic frequency control circuit and designed for use in an AM-FM receiver is described. The tuner employs a mixer transistor and an oscillator transistor connected in circuit so that they form a single series path across the bias source. This feature permits one to control conduction in both transistors by control of one and thus simplifies both biasing and mode conversion. Preferably, the transistor bias source and the source of AFC control potential are consolidated to save decoupling components. When the base of the mixer transistor is connected to the source through a low d.c. impedance, the AFC potential is transferred (less the mixer junction drop) to the collector of the oscillator transistor, where it provides sensitive automatic frequency control action. The circuit design uses a minimum of components.
REFERENCES:
patent: 3586887 (1971-06-01), Ziel et al.
patent: 3671884 (1972-06-01), Denny, Jr.
patent: 3673498 (1972-06-01), Harford
McGraw Hill Encyclopedia of Science and Technology, 1971, p. 563.
McFadyen Robert J.
Peil William
Baker Carl W.
General Electric Company
Griffin Robert L.
Lang Richard V.
Neuhauser Frank L.
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