Half-rate clock and data recovery circuit

Details Half-rate clock and data recovery circuit Half-rate clock and data recovery circuit

2006-05-23

2006-05-23

Burd, Kevin (Department: 2631)

Pulse or digital communications

Synchronizers

Phase displacement, slip or jitter correction

C373S017000, C373S017000

Reexamination Certificate

active

07050524

ABSTRACT:
A half-rate clock and data recovery circuit includes a phase detector capable of operating at a half-rate, a charge pump circuit, a low pass filter, and a voltage controlled oscillator. The phase detector includes a selector circuit which receives uninverted and inverted signals from respective latches of the phase detector and an uninverted and inverted half-rate clock and outputs uninverted and inverted retimed signals supplied to the charge pump so that the charge pump produces a full-rate output in response to a half-rate input. The circuit provides greater operating margin.

REFERENCES:
patent: 6847789 (2005-01-01), Savoj
Nakamura, Kazuyoki et al.; “A 6 Gps CMOS Phase Detecting DEMUX Module Using Half-Frequency Clock”, Symposium on VLSI Circuits Digest of Technical Papers, p. 196 (1998).
“A 10-GB/S Linear Half-Rate CMOS CDR Circuit”, High-Speed CMOS Circuits for Optical Receivers, pp. 77-93.

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