Phase-locked loop circuit

Details Phase-locked loop circuit Phase-locked loop circuit

1991-05-21

1993-06-15

Mis, David

Oscillators

Automatic frequency stabilization using a phase or frequency...

Particular error voltage control

331 1A, 331 16, H03L 710

Patent

active

052202941

ABSTRACT:
A phase-locked loop circuit comprises first and second charge pumps which apply charge and discharge voltages to a control voltage generator. The control voltage generator applies a control voltage which is dependent on the charge and discharge voltages to a voltage controlled oscillator. The voltage controlled oscillator generates an oscillation frequency dependent on the control voltage. The oscillation frequency is compared with a reference frequency to detect a difference therebetween. The first charge pump supplies a charge or discharge voltage to the control voltage generator intermittently for a first period, and the second charge pump, in parallel with the first charge pump, supplies a charge or discharge voltage to the control voltage generator continually for a second period subsequently to the first period, so that a time by which the difference becomes zero is shortened by use of the second charge pump as compared to a case where the first charge pump is only used.

REFERENCES:
patent: 4714899 (1987-12-01), Kurtzman et al.
patent: 4935707 (1990-06-01), Irwin
patent: 4980653 (1990-12-01), Shepherd

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