US Patent 7352307 Comparator chain offset reduction

Comparator chain total offset, static and dynamic, is reduced by injecting a compensation quantity in at least one point in the chain of comparator components. The compensation quantity is determined by providing the comparator chain with calibration signals having equal values and evaluating the output states of the comparator chain. The compensation quantity is adjusted until the probabilities of high and low output states are substantially equal and a calibrated value for the compensation is determined.