AFC circuit having local oscillator phase locked loop

Details AFC circuit having local oscillator phase locked loop AFC circuit having local oscillator phase locked loop

1994-10-21

1995-12-26

Grimm, Siegfried H.

Oscillators

Automatic frequency stabilization using a phase or frequency...

Plural oscillators controlled

331 10, 331 16, 331 17, 331 25, 375376, 455260, H03L 7085, H03L 7185

Patent

active

054791367

ABSTRACT:
An automatic frequency control circuit which can set a local oscillator synthesizer to a small frequency division number, without requesting the exact required frequency. The automatic frequency control circuit includes a voltage source for producing a desired voltage to offset the oscillation frequency of a voltage controlled oscillator, and an adder for adding the output from the voltage source to a frequency control signal of the voltage controlled oscillator. The automatic frequency control circuit is applicable to the receiver for a satellite telecommunications apparatus.

REFERENCES:
patent: 4811424 (1989-03-01), Cox
patent: 5115515 (1992-05-01), Yamamoto et al.

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