Patent · US Active

Phase-locked loop circuit

US7663417B2 · kind B2 · utility

1Cited by

8References

9Claims

0Family size

Assignee

TEXAS INSTRUMENTS DEUTSCHLAND GMBH · DE

Inventor

Gerd Rombach · Freising, DE

Key dates

Filing date	Jan 9, 2008
Grant date	Feb 16, 2010
Priority date	—
Expiry date	Feb 21, 2028

Classification

Technology area (CPC H)Electricity
CPC primaryH03L7/1072
WIPO fieldBasic communication processes
WIPO sectorElectrical engineering

Abstract

A phase-locked loop circuit comprises a phase frequency detector, a charge pump associated with a loop capacitance, and a voltage controlled oscillator. The phase frequency detector receives a reference clock signal on a first input and a feedback signal from the voltage controlled oscillator on a second input. The charge pump receives control inputs from outputs of the phase frequency detector. Pulse duration detecting circuitry limits charge and discharge current pulses supplied to the loop capacitance by the charge pump to durations less than predetermined permissible durations.

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