Automatic fine tuning circuit

Details Automatic fine tuning circuit Automatic fine tuning circuit

1979-03-29

1981-08-11

Ng, Jin F.

Telecommunications

Receiver or analog modulated signal frequency converter

Signal selection based on frequency

455258, 3581951, H04B 126, H04N 550

Patent

active

042837928

ABSTRACT:
In a system in which an intermediate frequency signal is synchronously detected using an intermediate frequency carrier signal derived from the intermediate frequency signal by means of a tuned circuit and a limiter circuit to remove amplitude variations therefrom, an automatic fine tuning signal is derived in a phase detector to which are fed the intermediate frequency carrier signal after its phase has been shifted 90 degrees in a phase shifter and either the intermediate frequency signal or the intermediate frequency carrier signal. When the intermediate frequency carrier signal is used in the phase detector, a second tuned circuit is used therein and buffering between the two tuned circuits prevents interaction therebetween.

REFERENCES:
patent: 3842198 (1974-10-01), Martin
patent: 3922483 (1975-11-01), Indri
patent: 3968325 (1976-07-01), Beriere
patent: 4091421 (1978-05-01), Long

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