Automatic frequency control oscillation circuit

Details Automatic frequency control oscillation circuit Automatic frequency control oscillation circuit

1997-02-06

1998-10-06

Hoang, Haun

Oscillators

Automatic frequency stabilization using a phase or frequency...

Particular error voltage control

331 25, 331 51, 327147, H03L 700

Patent

active

058183027

ABSTRACT:
A voltage-controlled oscillator generates an oscillation signal having a frequency corresponding to a control signal. A phase comparator detects a phase difference between a reference signal and a frequency-divided signal derived from the oscillation signal and generates a phase difference signal. A control circuit, which comprises an A/D converter, a high-speed processor, and a D/A converter, generates a control voltage so as to reduce a time-dependent change in the phase difference signal to synchronize the oscillation signal with the reference signal. When the synchronization of the oscillation signal with the reference signal is completed, the control circuit secures a control voltage at the time time-dependent change in the phase difference signal becomes equal to or smaller than a phase difference stored in a flash ROM.

REFERENCES:
patent: 4884040 (1989-11-01), Fling
patent: 5475718 (1995-12-01), Rosenkranz
patent: 5648964 (1997-07-01), Inagaki et al.

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