AFC voltage superimposing circuit for electronic tuner

Details AFC voltage superimposing circuit for electronic tuner AFC voltage superimposing circuit for electronic tuner

1977-01-17

1979-03-13

Gensler, Paul L.

Tuners

Tuner unit directly responsive to voltage and/or current...

Reactance tuning

325422, 331 36C, 331177V, H03J 318

Patent

active

041445120

ABSTRACT:
An AFC voltage superimposing circuit for an electronic tuner using a plurality of varactors as a tuning element, comprising a plurality of resistors for superimposing an AFC voltage on a tuning voltage and a bypass circuit. The bypass circuit includes at least a voltage regulating diode and a diode which are connected in series so as to have the characteristic of permitting a current to flow in one direction only. When the tuning voltage exceeds a predetermined level, the voltage regulating diode comes into a conducting state, thereby increasing the AFC voltage variation superimposed on the tuning voltages, so that the interchannel deviation of AFC sensitivity may be gently compensated.

REFERENCES:
patent: 3699455 (1972-10-01), Kruszewski et al.
patent: 3824474 (1974-07-01), Sakamoto
patent: 3959728 (1976-05-01), Yamazaki et al.
patent: 3991371 (1976-11-01), Shelby
patent: 4005256 (1977-01-01), Arumugham

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