Paul
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Vivek,
Just to be sure, you are talking about the amplifier in the gain stage of the pipeline converter, right? Its closed-loop gain is very critical in the correct operation of the amplifier, because unlike the A/D part, there is no alternative path to correct for this error. As it affects the value of the error signal delivered to the next stage, I believe it does not only contribute to gain error, but also to non-linearity.
For details on calibration of interstage gain errors, you can read the following papers: Digital-domain calibration of multistep analog-to-digital converters Lee, S.-H.; Song, B.-S.; Solid-State Circuits, IEEE Journal of Volume 27, Issue 12, Dec. 1992 Page(s):1679 - 1688
Interstage gain proration technique for digital-domain multi-step ADC calibration Seung-Hoon Lee; Bang-Sup Song; Circuits and Systems II: Analog and Digital Signal Processing, IEEE Transactions on Volume 41, Issue 1, Jan. 1994 Page(s):12 - 18
Paul
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