Phase-locked loop circuit with variable bandwidth filter

Details Phase-locked loop circuit with variable bandwidth filter Phase-locked loop circuit with variable bandwidth filter

1982-04-14

1985-06-25

LaRoche, Eugene R.

Oscillators

Automatic frequency stabilization using a phase or frequency...

Particular error voltage control

331 25, 331DIG2, 329 50, 329122, 329124, 381 15, H03L 708

Patent

active

045256861

ABSTRACT:
A phase-locked loop circuit comprises an oscillator, a phase comparator which compares the phase of an input signal with the phase of an oscillator signal, a detector which detects when the phase-locked loop circuit is locked within a predetermined frequency range and produces a corresponding lock detecting signal, and a filter circuit including a variable current source which produces a variable current in response to a change of state of the lock detecting signal to control the bandwidth of the filter circuit, a filter element which receives the variable current, a differential amplifier which receives the phase-compared signal, a current mirror circuit which receives the variable current from the variable current source, and a buffer circuit connected to the filter element which supplies an output signal to the oscillator to lock the frequency of the oscillator signal to the frequency of the input signal.

REFERENCES:
patent: 3958186 (1976-05-01), Jesse et al.
patent: 4007429 (1977-02-01), Cadalora et al.
patent: 4115745 (1978-09-01), Egan
patent: 4135165 (1979-01-01), Coe
patent: 4167711 (1979-09-01), Smoot
patent: 4205277 (1980-05-01), Poinas
patent: 4374335 (1983-02-01), Fukahori et al.

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