the electrical circuitry for a multiplier system includes a counter for determining proximity to sampling operation , and a switch to select between symmetrical noise invariant operation and a low - power mode of operation . a noise invariant circuit disables row skip operation in a multi - row multiplier , to enable analog sampling . disabling of the row skip operation is accomplished at a time which is several digital cycles preceding the time of analog sampling . power saving multiplier row skippage resumes after analog sampling is completed .