Automatic fine tuning circuit

Details Automatic fine tuning circuit Automatic fine tuning circuit

H - Electricity

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325/106

H04B 1/26 (2006.01) H03D 1/22 (2006.01) H03D 3/20 (2006.01) H03J 7/04 (2006.01) H04N 5/50 (2006.01) H03D 13/00 (2006.01)

Patent

CA 1122660

ABSTRACT OF THE DISCLOSURE In a system in which an intermediate frequency signal is synchronously detected using an intermediate frequency carrier signal derived using 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.

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