ESTIMATION OF DAC WEIGHTING CAPACITORS MISMATCH IN PIPELINED ADCs EMPLOYING FINITE GAIN OP-AMPs

Matteo Tonelli, Giovanni Chiorboli, Carlo Morandi

Abstract

A D/A subconverter (DASC) error correction scheme based on weighting capacitor rotation is adapted to account for finite op-amp gain. Simulations show that reasonable estimates of capacitor mismatch can be obtained even if the actual gain is replaced by a nominal gain differing by as much as a factor of two.<BR />DASC capacitor mismatch might therefore be estimated in the foreground at power-up, and most part of the correspondingmismatch noise and mismatch-induced interstage gain error might be cancelled, possibly delegating to a background calibration the task of correcting the remaining interstage gain error, induced by finite op-amp gain and drift with temperature.

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IMEKO TC

TC4 - Measurement of Electrical Quantities

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