Miscellaneous active electrical nonlinear devices – circuits – and – Signal converting – shaping – or generating – Phase shift by less than period of input
Reexamination Certificate
2008-09-16
2008-09-16
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, C327S359000
Reexamination Certificate
active
11479749
ABSTRACT:
A phase interpolator generates a phase-interpolated output clock signal Z from two phase-offset input clock signals A and B, where the interpolation angle of the output clock is based on a weight value W. The phase interpolator has A-side and B-side circuitry, each having (1) an array of parallel current mirrors, (2) a block of parallel switches, where each switch is connected in series with a corresponding current mirror, and (3) an encoder that controls the corresponding switches based on the weight value W. The total current through the phase interpolator varies with interpolation angle, such that, for example, the variation in output amplitude with interpolation angle is reduced. In general, individual bit values in weight value W are not used to control individual switches for all interpolation angles.
REFERENCES:
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patent: 6359486 (2002-03-01), Chen
patent: 6597212 (2003-07-01), Wang et al.
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Abel Christopher J.
Anidjar Joseph
Sindalovsky Vladimir
Ziemer Craig B.
Agere Systems Inc.
Mendelsohn Steve
Mendelsohn & Associates
Nguyen Hai L.
Wells Kenneth B.
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