Afc circuit

Details Afc circuit Afc circuit

H - Electricity

04

N

350/88

H04N 5/04 (2006.01) H03L 7/091 (2006.01) H04N 5/12 (2006.01)

Patent

CA 1172751

ABSTRACT OF THE DISCLOSURE An AFC circuit is disclosed which comprises an oscillating circuit for generating repetitive pulses, a generator generating comparison signals having a slope portion from the above repetitive pulses, and a phase comparison circuit having a first input terminal supplied with the comparison signals, a second input terminal supplied with sync signals as reference signals and an output terminal supplying an automatic frequency control signal to the oscillating circuit. In this case, the AFC circuit further comprises a limiting circuit connected between the comparison signal generator and the phase comparison circuit so as to limit the maximum level and minimum level of the comparison signals to first and second predetermined levels respectively, thereby limiting a control range of the AFC circuit to a predetermined range.

380602

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