Phase-locked loop circuit

Details Phase-locked loop circuit Phase-locked loop circuit

2005-02-14

2011-10-04

Kinkead, Arnold (Department: 2817)

Oscillators

Electrical noise or random wave generator

C331S016000, C331S175000, C331S034000, C331S00100A, C331S025000, C332S127000, C327S156000

Reexamination Certificate

active

08031015

ABSTRACT:
A PLL circuit is disclosed that comprises a controlling unit that switches at a predetermined timing to enable/disable the phase difference signal supplied from the phase comparator to the low pass filter; and a resistor element that is disposed between a predetermined potential and a signal line for supplying the phase difference signal from the phase comparator to the low pass filter, when the phase difference signal is enabled, the oscillation circuit performing oscillation operation based on the voltage signal corresponding to the phase difference signal, when the phase difference signal is disabled, the low pass filter being supplied with the predetermined potential through the resistor element to allow the oscillation circuit to perform oscillation operation based on the voltage signal generated depending on the supplied predetermined potential.

REFERENCES:
patent: 4937536 (1990-06-01), Reinhardt et al.
patent: 5903197 (1999-05-01), Kikugawa
patent: 6157271 (2000-12-01), Black et al.
patent: 1203483 (1998-12-01), None
patent: 2000-101424 (2000-04-01), None
patent: 2000-252817 (2000-09-01), None
patent: 2001-07700 (2001-01-01), None

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