Aft circuit

Details Aft circuit Aft circuit

H - Electricity

04

B

365/14

H04B 1/16 (2006.01) H03J 7/08 (2006.01) H04N 5/50 (2006.01)

Patent

CA 1135884

ABSTRACT OF THE DISCLOSURE An AFT circuit in which a frequency discriminated video intermediate frequency signal is supplied to a capacitor and a voltage across the capacitor is supplied to a variable reactance element of a tuner as an AFT voltage is disclosed. In this case, the AFT circuit includes a level comparing circuit for comparing the voltage across the capacitor with a reference voltage, a first switching element which is controlled by the level comparing circuit and forms a charging path for the capacitor, a second switching element which is controlled by the level comparing circuit and forms a discharging path for the capacitor, and a third switching element which will make the first and second switching elements OFF upon an AFT operation.

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