Patent · US Expired

Frequency comparator with hysteresis between locked and unlocked conditions

US6859107B1 · kind B1 · utility

38Cited by

9References

25Claims

0Family size

Assignee

Silicon Image, Inc. · US

Inventors

Yongsam Moon · Cupertino, US
Gijung Ahn · Sunnyvale, US
Deog-Kyoon Jeong · Seoul, KR

Key dates

Filing date	Jan 30, 2003
Grant date	Feb 22, 2005
Priority date	—
Expiry date	Feb 13, 2023

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY10S331/02
WIPO fieldBasic communication processes
WIPO sectorElectrical engineering

Abstract

A frequency comparator apparatus used with a reference clock, a voltage controlled oscillator circuit and a phase locked loop circuit includes a reference loop circuit wherein the reference loop circuit is activated when the frequency difference between the reference clock and the voltage controlled oscillator circuit is greater than about a first threshold. Also included is a data loop circuit wherein the data loop circuit is activated when the frequency difference between the reference clock and the voltage controlled oscillator circuit is less than about a second threshold.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.