Coded data generation or conversion – Analog to or from digital conversion – Analog to digital conversion
Reexamination Certificate
2005-02-01
2005-02-01
JeanPierre, Peguy (Department: 2819)
Coded data generation or conversion
Analog to or from digital conversion
Analog to digital conversion
C341S155000
Reexamination Certificate
active
06850181
ABSTRACT:
An apparatus and method for noise reduction in a successive approximation (SA) analog-to-digital converter (ADC) is provided. The SA ADC includes a noise-compensating comparator circuit, an SA logic circuit, and a DAC circuit. A first reference signal is generated such that the first reference signal has a noise component that is substantially similar to a noise component of a first comparison signal. The noise-compensated comparator circuit is configured to provide a differential signal. The first comparison signal is included in a first half of the differential signal, and the first reference signal is included in a second half of the differential signal, such that the noise component of the first comparison signal is substantially cancelled out differentially. The noise-compensating comparator circuit is further configured to compare the two halves of the differential signal to provide a comparator output signal.
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Darby & Darby P.C.
Gaffney Mathew M.
Jean-Pierre Peguy
National Semiconductor Corporation
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