High-frequency linear phase-frequency detector with...

Details High-frequency linear phase-frequency detector with... High-frequency linear phase-frequency detector with...

2006-01-06

2008-10-28

Pascal, Robert J. (Department: 2817)

Miscellaneous active electrical nonlinear devices, circuits, and

Specific signal discriminating without subsequent control

By phase

C327S157000

Reexamination Certificate

active

07443206

ABSTRACT:
A circuit and method are provided for detecting a phase difference between at least two periodic signals. The circuit and method disclosed herein provide pulsed output signals with wide output pulse widths well suited for use to drive a charge-pump in a phase-locked loop. The wide pulse widths of the output signals generated by the circuit and method allow the charge-pump to sink or source current with higher accuracy and therefore improve the operational characteristics of the phase-locked loop. Further, the circuit and method disclosed herein allow a phase-frequency detector and an associated charge-pump to operate at a higher operational frequency due to the wide pulse widths.

REFERENCES:
patent: 5754080 (1998-05-01), Chen et al.
patent: 6075388 (2000-06-01), Dalmia
patent: 6259754 (2001-07-01), Jeong

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