Patent · US Active

Fractional-N frequency synthesizer

US7498856B2 · kind B2 · utility

51Cited by

7References

16Claims

0Family size

Assignee

REALTEK SEMICONDUCTOR CORP. · TW

Inventors

Chia-Liang Lin · Fremont, US
Gerchih Chou · San Jose, US

Key dates

Filing date	Nov 28, 2006
Grant date	Mar 3, 2009
Priority date	—
Expiry date	Jan 27, 2027

Classification

Technology area (CPC H)Electricity
CPC primaryH03L7/0898
WIPO fieldBasic communication processes
WIPO sectorElectrical engineering

Abstract

A circuit, with applications to phase-locked loops and frequency synthesis, where a divider circuit shuffles between dividing the output of a voltage-controlled oscillator by N or N+1, where N is an integer, and where a phase frequency detector provides three logic signals to a charge pump so that one of three values of current may be sourced to a loop filter, with the result that the circuit behaves as a conventional phase-lockup loop fictitious divider circuit that is capable of dividing the output of the voltage-controlled oscillator by a non-integral value.

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