Oscillators – Ring oscillators
Patent
1996-11-15
1999-02-16
Mis, David
Oscillators
Ring oscillators
331 34, 331175, 331177R, 375376, H03B 524, H03B 504, H03L 100, H03L 7099
Patent
active
058724885
ABSTRACT:
A dual input voltage controlled oscillator ("VCO") suitable for use in clock and data recovery ("CDR") systems operating at 100s to 1,000s of MB/sec is described. When a PLL using this VCO is locked onto a data stream of a fixed bit rate, the bang/bang frequency of the VCO does not vary due to process and temperature variation occuring either during manufacture or operation. The VCO is also relatively insensitive to supply voltage variations.
REFERENCES:
patent: 5012494 (1991-04-01), Lai et al.
patent: 5673008 (1997-09-01), Sumita
Digital Line Systems Based on the Synchronous Digital Hierarchy for Use on Optical Fibre Cables, CCITT Recommendation G.958, Geneva 1990, pp. 15-17.
"A Monolithic 622 Mb/s Clock Extraction Data Retiming Circuit", Benny Lai and Richard Walker, 1991 ISSCC Proceedings, TPM 8.7, pp. 144-145.
"A 2-Chip 1.5 Gb/s Bus-Oriented Serial Link Interface", 1992 ISSCC Proceedings, FA 14.4, pp. 226-227, Walker et al.
"G-Link: A Chipset for Gigabit-Rate Data Communication", Hewlett-Packard Journal, vol. 43, No. 5, Oct. 1992, pp. 103-116, Yen et al.
Hewlett--Packard Company
Mis David
Penn Jonathan B.
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