Coded data generation or conversion – Converter compensation
Reexamination Certificate
2010-01-21
2010-11-23
Mai, Lam T (Department: 2819)
Coded data generation or conversion
Converter compensation
C375S232000
Reexamination Certificate
active
07839313
ABSTRACT:
Techniques for correcting component mismatches in an M-channel time-interleaved Analog to Digital Converter (ADC). In order to obtain an error measure for offset, gain or phase, errors, outputs from each ADC are either summed or averaged over Nosamples. Calling each of the sums or averages as Xkwhere k=1, 2, . . . , M, there are M such values as a result. A single value representing the mean of these M values, Xmean, is chosen as a reference value. The offset, gain and phase errors for the M different ADCs are then obtained from Xk−Xmean. The sign of each offset error, i.e., sign (Xk−Xmean), is then used to drive an adaptive algorithm whose output represents an offset correction value for the corresponding ADC. The offset, gain, and phase correction outputs from the adaptive algorithm is fed to an array of Digital-to-Analog converters (DACs) whose outputs are voltages or currents that directly or indirectly controls the offset, gain or phase setting of each individual ADC. Thus, there are M different offset, gain and phase error signals and M different adaptive algorithms operating in conjunction with M different DACs providing offset control signals to M different ADCs. In certain embodiments, spur frequencies can be reduced with the use of notch filters.
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Hamilton Brook Smith & Reynolds P.C.
Intersil America's Inc.
Mai Lam T
LandOfFree
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