Miscellaneous active electrical nonlinear devices – circuits – and – Signal converting – shaping – or generating – Phase shift by less than period of input
Reexamination Certificate
2009-09-24
2011-10-11
Luu, An (Department: 2816)
Miscellaneous active electrical nonlinear devices, circuits, and
Signal converting, shaping, or generating
Phase shift by less than period of input
C327S237000, C327S355000
Reexamination Certificate
active
08035436
ABSTRACT:
A phase-interpolator circuit is described. In the phase-interpolator circuit, an output signal, having a fundamental frequency and a phase, is generated based on a weighted summation of a first reference signal and a second reference signal, where the first reference signal has the fundamental frequency and a first phase, and the second reference signal has the same fundamental frequency and a second phase. Note that contributions of the first reference signal and the second reference signal, respectively, to the output signal are determined based on associated first and second impedance values in a weighting circuit in the phase-interpolator circuit. For example, a programmable capacitance ratio of two capacitors may be used to interpolate between the first reference signal and the second reference signal. Additionally, the phase-interpolator circuit may include a biasing circuit that provides a DC bias to the weighting circuit, and which amplifies the output of the weighting circuit to provide the output signal.
REFERENCES:
patent: 5341050 (1994-08-01), Mellissinos et al.
patent: 5465064 (1995-11-01), Shou et al.
patent: 6107871 (2000-08-01), Shin
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patent: 6696876 (2004-02-01), Drost et al.
patent: 2010/0079180 (2010-04-01), Kim et al.
Ali Tamer M.
Drost Robert J.
Yang Chih-Kong Ken
Luu An
Oracle America Inc.
Park Vaughan Fleming & Dowler LLP
Stupp Steven E.
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