Switchable capacitor loop filter for phase locked loop

Details Switchable capacitor loop filter for phase locked loop Switchable capacitor loop filter for phase locked loop

1989-12-28

1991-06-04

Grimm, Siegfried H.

Oscillators

Automatic frequency stabilization using a phase or frequency...

Particular error voltage control

331 14, 328155, H03L 710

Patent

active

050217496

ABSTRACT:
A phase-locked loop circuit having a loop filter supplied with a detection indication of a phase difference between an input signal and an output signal from a voltage-controlled oscillator to control the oscillation of the voltage-controlled oscillator. The loop filter includes a first capacitance element connected between an output terminal of the loop filter and a first power supply potential point, a second capacitance element connected between the output terminal and a second power supply potential point, a third capacitance element connected in parallel to the first capacitance element when a first indication is obtained by the detection of a phase difference, a fourth capacitance element connected in parallel to the second capacitance element when a second indication is obtained by the detection of a phase difference, and control members for forming a first current path between the output terminal and the first power supply potential point when the first indication is obtained and for forming a second current path between the output terminal and the second power supply potential point when the second indication is obtained. The phase-locked loop circuit can be readily fabricated in the form of an integrated circuit, and it is possible to conduct a lock-in operation speedily and reliably at the time when the circuit power supply is turned on.

REFERENCES:
patent: 4524333 (1985-06-01), Iwata et al.

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