Phase and frequency detector with zero static phase error

Details Phase and frequency detector with zero static phase error Phase and frequency detector with zero static phase error

2007-12-19

2009-10-06

Donovan, Lincoln (Department: 2816)

Miscellaneous active electrical nonlinear devices, circuits, and

Specific signal discriminating without subsequent control

By phase

C327S007000, C327S003000

Reexamination Certificate

active

07598775

ABSTRACT:
A method and circuit for phase and frequency detection having zero static phase error for use in a phase-locked loop system is presented. The phase and frequency detector utilizes a first phase and frequency detector configured to generate first and second pulsed PFD signals. Pulse blocking circuitry is utilized to provide first and second output signals based on the first and second pulsed signals respectively, wherein a time period when both first and second output signals are asserted is substantially reduced from a time period when both first and second pulsed signals are asserted. By reducing the time the first and second output signals are simultaneously asserted, the effects of charge pump current source mismatch are minimized and static phase error is reduced.

REFERENCES:
patent: 4904948 (1990-02-01), Asami
patent: 5373255 (1994-12-01), Bray et al.
patent: 6002273 (1999-12-01), Humphreys
patent: 6605935 (2003-08-01), Nilsson
patent: 6642747 (2003-11-01), Chiu
patent: 7046042 (2006-05-01), Dino et al.

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