Phase frequency detector

Details Phase frequency detector Phase frequency detector

1997-03-19

1999-10-05

Lam, Tuan T.

Miscellaneous active electrical nonlinear devices, circuits, and

Specific signal discriminating without subsequent control

By phase

327 12, H03L 7089

Patent

active

059630582

ABSTRACT:
Briefly, in accordance with one embodiment of the invention, an integrated circuit includes: a phase frequency detector (PFD) including two clock input ports, an up signal output port, and a down signal output port. The PFD includes digital circuitry including transistors coupled in a configuration to adjust an amount of overlap of an up signal and a down signal based, at least in part, upon the magnitude of an amount of phase delay between two clock signals respectively applied to the PFD input ports. Briefly, in accordance with another embodiment of the invention, an integrated circuit includes: a phase frequency detector (PFD) including two clock input ports, an up signal output port, and a down signal output port. The PFD includes digital circuitry including transistors coupled in a configuration to produce a PFD output signal in which the sign of the phase delay indicated remains the sign of the phase delay between the applied clock signals even as the magnitude of the phase delay approaches a significant proportion of 360.degree..

REFERENCES:
patent: 4568881 (1986-02-01), Kostrov
patent: 4970475 (1990-11-01), Gillig
patent: 5142555 (1992-08-01), Whiteside
patent: 5592110 (1997-01-01), Noguchi
Synchronization In Digital Communications, vol. I, Phase Frequency Locked Loops, And Amplitude Control; Authors: Heinrich Meyr, Gerd Ascheid; John Wiley & Sons, Inc. 1989, pp. 68-79.

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