Frequency controlled signal generating circuit

Details Frequency controlled signal generating circuit Frequency controlled signal generating circuit

H - Electricity

03

L

352/20, 331/32

H03L 7/08 (2006.01) H03L 7/113 (2006.01)

Patent

CA 1157537

ABSTRACT OF THE DISCLOSURE A circuit arrangement for generating a frequency controlled signal synchronous with an input signal by an automatic phase control circuit having a variable frequency oscillator generating the frequency controlled signal and a phase comparator generating a control voltage based on the phase variation of the input signal, the control signal being supplied to the variable frequency oscillator to control the frequency of the frequency controlled signal. The circuit arrangement includes a circuit for detecting a frequency difference between the frequency controlled signal and a reference signal from a reference oscillator, and a circuit for comparing the outputs from the phase comparator and the frequency difference detecting circuit to produce an additional control voltage to be mixed with the control voltage.

365872

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