Comparator having reduced sensitivity to offset voltage and timing errors

摘要

A comparator comprises a switching means for supplying two different threshold voltages to the comparator upon a first and a second control signal, respectively. The second control signal is enabled by a rising or a falling edge of the comparator output that is coupled to a control means providing the second control signal. The time interval that a varying input signal requires to change its amplitude crossing and in between the two threshold voltages can thus be detected by two subsequent rising or falling edges of the comparator output without the adverse influence of the comparator's meta-stability.