raja.cedt wrote on Sep 17th, 2009, 8:55pm:hi,
first design high speed comparator and don't consider offset and then nullify offset using digital calibration (it is much better than other analog cancellation techniques from tuning point of view)
Thanks,
Rajasekhar.
Calibration is certainly another option, but
1) Offset drifts (over temp) will NOT be compensated for, and that might be a problem depending on the application.
2) If done periodically, is then somehow like autozeroing the comparator in a digital rather than in an analog way, and as I pointed out before, might imply some noise performance degradation which might be important in this ckt design.
Regards
Tosei