Phase locked loop (PLL) circuit having variable loop filter for

Details Phase locked loop (PLL) circuit having variable loop filter for Phase locked loop (PLL) circuit having variable loop filter for

1995-02-27

1996-07-09

Mis, David

Oscillators

Automatic frequency stabilization using a phase or frequency...

Tuning compensation

331 1A, 331 8, 331 17, 331 25, 327105, 327159, 455260, H03L 7093, H03L 7107, H03L 718

Patent

active

055348238

ABSTRACT:
Disclosed herein is A-phase-locked-loop PLL circuit including a voltage controlled oscillator (VCD) controlled in oscillation frequency by a control voltage, a divider dividing in frequency an oscillation signal of the VCO by a frequency division ratio to produce a frequency-divided signal, a phase comparator producing a phase comparison signal indicative of a difference in phase between a reference signal and the frequency-divided signal, and a filter converting the phase comparison signal into the control voltage to be used for controlling the VCO. The oscillation frequency of the VCO is thereby changed from a current frequency by variation of the frequency-division ratio and locked to a new frequency after a locking period of time elapses. There is further provided a control circuit which changes a time constant of the filter circuit a plurality of times during the locking period of time, this control circuit operating in response to the output of the phase comparator.

REFERENCES:
patent: 5347233 (1994-09-01), Ishibashi et al.
patent: 5384550 (1995-01-01), Henely et al.
patent: 5389899 (1995-02-01), Yahagi et al.
patent: 5408202 (1995-04-01), Shirazi et al.
patent: 5420545 (1995-05-01), Davis et al.

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