System and method for comparator threshold adjustment

摘要

A system and method are provided for compensating a comparator threshold level. The method comprises: accepting an input signal with an ac component; lowpass filtering the input signal to generate the input signal average voltage; accepting the input signal average voltage; accepting a first dc level; summing the average voltage with the first dc level; supplying a first sum as a first comparator threshold level; comparing the input signal to the first comparator threshold level; and, supplying a first comparator output signal with an ac component. In some aspects of the method, accepting a first dc level includes accepting a plurality of dc levels. Then, the average voltage is summed with each of the plurality of dc levels and supplied as a corresponding plurality of comparator threshold levels. The input signal is compared to each of the comparator threshold levels and a plurality of comparator output signals are supplied.