Coded data generation or conversion – Converter calibration or testing
Reexamination Certificate
2007-06-28
2008-12-16
JeanPierre, Peguy (Department: 2819)
Coded data generation or conversion
Converter calibration or testing
C341S155000
Reexamination Certificate
active
07466251
ABSTRACT:
Disclosed is a time-interleaved A/D converter device that including first and second digital filters that respectively perform filter processing on output signals of first and second A/D converter circuits driven by first and second clocks, respectively, an interpolator that receives an output signal of the first digital filter and derives an interpolation value corresponding to a case where an input signal is sampled using the second clock signal free of a clock skew and having a predetermined phase relationship with respect to the first clock signal, a phase comparison circuit that receives the output of the first digital filter, an output of the second digital filter, and an interpolation signal from the interpolator, and outputs a first signal indicating a phase advance or a phase delay of the second signal responsive to a gradient of the input signal and a second signal indicating whether the output signal of the second digital filter matches the interpolation signal or not, a digital filter that receives the first and second signals output from the phase comparison circuit, and outputs zero when the second signal indicates a match and outputs a polarity of a value obtained b by selecting a positive value or a negative value according to the delay or advance indicated by the first signal and averaging selected values when the second signal indicates a mismatch, and a variable delay circuit that receives an output of the digital filter and changes a delay time of the second clock signal.
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Yosiro, Miida, “Numerical Calculation Method”, Morikita Publishing, Co., Ltd., 1991, pp. 26-30.
Jean-Pierre Peguy
McGinn IP Law Group PLLC
NEC Electronics Corporation
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