AFC circuit compensating an error in oscillation frequency

Details AFC circuit compensating an error in oscillation frequency AFC circuit compensating an error in oscillation frequency

2005-02-08

2005-02-08

Nguyen, Minh (Department: 2816)

Oscillators

Automatic frequency stabilization using a phase or frequency...

Particular error voltage control

C331S018000, C331S00100A, C375S344000

Reexamination Certificate

active

06853255

ABSTRACT:
An AFC circuit compensates for an error of the oscillation frequency of a detecting oscillator based on a detection signal from a detector circuit. The detector circuit generates the detection signal at a timing tied to the oscillation frequency of said detecting oscillator. The AFC circuit has a frequency error determining circuit; a reference oscillator, a frequency error/control voltage conversion circuit; a PLL (phase lock loop) circuit; and a detecting frequency computing circuit. The reference oscillator is connected to provide an oscillator input to said PLL, and the PLL is connected to provide a control voltage to said detecting oscillator. The detecting oscillator is responsive to the control voltage for controlling the oscillation frequency thereof. The AFC circuit controls the oscillation frequency of the detecting oscillator based on the frequency error value so as to vary the oscillation frequency used as a sampling frequency of the detector circuit.

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