Coded data generation or conversion – Analog to or from digital conversion – Analog to digital conversion
Reexamination Certificate
2006-10-03
2006-10-03
Mai, Lam T. (Department: 2819)
Coded data generation or conversion
Analog to or from digital conversion
Analog to digital conversion
C341S172000
Reexamination Certificate
active
07116260
ABSTRACT:
A mismatch shaped analog to digital converter. The novel analog to digital converter includes a first circuit for providing a plurality of reference voltages, a plurality of comparators adapted to compare an input signal with the reference voltages, and a second circuit for randomizing connections between the reference voltages and the comparators. The connections are randomized such that noise caused by mismatch errors is spectrally shaped according to a desired noise-shaping characteristic. In an illustrative embodiment, the second circuit includes a noise-shaping circuit comprised of a plurality of Delta-Sigma modulators for generating one or more control signals, and a router for connecting the reference voltages to the comparators in accordance with the control signals. The mismatch shaped analog to digital converter can be used within a Delta-Sigma modulator to shape noise caused by mismatch errors in the feedback digital to analog converter.
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Alkov Leonard A.
Mai Lam T.
Raytheon Company
Vick Karl A.
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