mex simulink
You first model your system from top level to sub blocks...it would contain...comparators....S/H...m-DAC...dig correction blocks etc....now just write the routines for each of them....this routine basically contain the IP-OP relation-ship of the blocks (in voltage domain)....just like C-prog....
Once this is done you call them in proper manner....I guess this will do the job....
I once did it in MATLAB...not in simulaink....thus with simple math functions it was done....
now you can give some variable for the offset/error in reference/S/H or m-dac....just put them mathimatecally.....you will be getting it....
I can give you one more reference......although this is not related to modeling in simulink...but discusses about pipeline ADC in good manner....
may help you....
Digital techniques for improving the accuracy of data converters
Un-Ku Moon; Temes, G.C.; Steensgaard, J.;
Communications Magazine, IEEE
Volume 37, Issue 10, Oct. 1999 Page(s):136 - 143
Digital Object Identifier 10.1109/35.795604
Summary: This article provides a tutorial overview of some previously developed methods for enhancing the accuracy and linearity of data converters (analog-to-digital as well as digital-to-analog) by introducing auxiliary digital circuitry which calibrates, c.....
gd luck...
sankudey