Miscellaneous active electrical nonlinear devices – circuits – and – Signal converting – shaping – or generating – Phase shift by less than period of input
Reexamination Certificate
2007-01-04
2008-10-28
Richards, N. Drew (Department: 2816)
Miscellaneous active electrical nonlinear devices, circuits, and
Signal converting, shaping, or generating
Phase shift by less than period of input
C327S235000, C708S290000
Reexamination Certificate
active
07443219
ABSTRACT:
A phase interpolator circuit may comprise a multiplexer circuit (MUX) coupled to a plurality of clock signals at MUX inputs and may provide a first clock signal and a second clock signal at MUX outputs that are out of phase with each other, a digital to analog converter circuit (DAC) to convert a digital input to first and second DAC current outputs such that a sum of the first and second DAC output currents comprises a substantially constant current value, a weighted averager circuit coupled to the MUX and the DAC, and a variable capacitive load circuit coupled to the first and second DAC current outputs. The weighted averager circuit may operate to sum weighted first and second clock signals and to output a phase interpolated clock signal, wherein the first clock signal is weighted according to a first DAC output current and the second clock signal is weighted according to a second DAC output current. Other apparatus, systems, and methods are disclosed.
REFERENCES:
patent: 4686688 (1987-08-01), Chung et al.
patent: 5541961 (1996-07-01), Farrow
Luu An T.
Micro)n Technology, Inc.
Richards N. Drew
Schwegman Lundberg & Woessner, P.A.
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