Miscellaneous active electrical nonlinear devices – circuits – and – Signal converting – shaping – or generating – Phase shift by less than period of input
Reexamination Certificate
2007-11-20
2007-11-20
Wells, Kenneth B. (Department: 2816)
Miscellaneous active electrical nonlinear devices, circuits, and
Signal converting, shaping, or generating
Phase shift by less than period of input
C327S234000, C327S235000, C327S359000, C327S560000
Reexamination Certificate
active
11095771
ABSTRACT:
Methods and apparatus are provided for improving phase switching and linearity in an analog phase interpolator. A phase interpolator in accordance with the present invention comprises (i) a plurality of tail current sources that are activated for substantially all times when the phase interpolator is operational; (ii) at least two pairs of input transistor devices, wherein one pair of the input transistor devices is associated with a minimum phase of the phase interpolator and another pair of the input transistor devices is associated with a maximum phase of the phase interpolator; and (iii) a plurality of current steering switches that provide currents generated by the plurality of tail current sources to one or more of the at least two pairs of input transistor devices, based on an applied interpolation control signal.
REFERENCES:
patent: 5122687 (1992-06-01), Schmidt
patent: 5151624 (1992-09-01), Stegherr et al.
patent: 5371475 (1994-12-01), Brown
patent: 5625318 (1997-04-01), Sevenhans et al.
patent: 6597212 (2003-07-01), Wang 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.
Luu An T.
Wells Kenneth B.
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