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. 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.
|Titolo:||Estimation of DAC Weighting Capacitors Mismatch in Pipelined ADCs Employing Finite Gain Op-Amps|
|Data di pubblicazione:||2011|
|Appare nelle tipologie:||4.1b Atto convegno Volume|