Patent · US Active

Look loop circuit and method having improved lock time

US7595699B1 · kind B1 · utility

3Cited by

5References

20Claims

0Family size

Assignee

Freeescale Semiconductor, Inc. · US

Inventors

David Schlueter · Lake Villa, US
Michael DOLL · Riedstadt, DE

Key dates

Filing date	Mar 4, 2008
Grant date	Sep 29, 2009
Priority date	—
Expiry date	Mar 20, 2028

Classification

Technology area (CPC H)Electricity
CPC primaryH03L7/1075
WIPO fieldBasic communication processes
WIPO sectorElectrical engineering

Abstract

A lock loop circuit (230) includes a floating ground loop filter circuit (302) and a precharge circuit (304). The floating ground loop filter circuit includes at least one capacitive element (326, 328). The floating ground loop filter circuit provides a steering signal (334) for a controllable oscillator circuit (306) in response to a precharge signal (347). The precharge circuit provides the precharge signal in response to lock loop enable information (226). The precharge circuit controls the floating ground loop filter to bypass the at least one capacitive element for a period of time (606) in response to the lock loop enable information.

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