Miscellaneous active electrical nonlinear devices – circuits – and – Signal converting – shaping – or generating – Phase shift by less than period of input
Reexamination Certificate
2007-04-17
2007-04-17
Callahan, Timothy P. (Department: 2816)
Miscellaneous active electrical nonlinear devices, circuits, and
Signal converting, shaping, or generating
Phase shift by less than period of input
C327S250000
Reexamination Certificate
active
11095772
ABSTRACT:
Methods and apparatus are provided for maintaining a desired slope of clock edges in a phase interpolator using an adjustable bias. The disclosed phase interpolator comprises at least one delay element to generate at least two interpolation signals each having an associated phase and a variable slope unit associated with each of the at least two interpolation signals, wherein a slope of each of the variable slope units is controlled by a bias signal and is varied based on a data rate of the interpolation signals. The slope is varied to maintain a desired slope of clock edges associated with the interpolation signals. The slope can be maintained, for example, between approximately the value of the delay between consecutive clock edges and twice the value of the delay between consecutive clock edges.
REFERENCES:
patent: 6194947 (2001-02-01), Lee et al.
patent: 6204733 (2001-03-01), Cai
patent: 6359486 (2002-03-01), Chen
patent: 6888389 (2005-05-01), Baba
patent: 7016452 (2006-03-01), Partsch et al.
patent: 7084689 (2006-08-01), Carballo et al.
patent: 2005/0227660 (2005-10-01), Hashemi et al.
Weinlander et al., “An 8 channel 36G Sample/s CMOS Timing Analyzer,” IEEE ISSCC (2000).
Sidiropoulos et al., “A Semi-digital Dual Delay-Locked Loop,” IEEE JSSC, vol. 32, No. 11 (1997).
Freyman Ronald L.
Ziemer Craig B.
Agere Systems Inc.
Callahan Timothy P.
Luu An T.
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