Voltage comparator circuit

摘要

A voltage comparator that realizes high-speed operation with a simple structure includes an input differential stage having a first differential pair and a second differential pair, into which a differential voltage is inputted from differential input terminals In⁺ and In^-, with reverse polarity to each other, folded cascode-type differential stages, which adds a differential output signal of the first differential pair and a differential output signal of the second differential pair and is connected to a differential output of the input differential stage, and oppositely disposed first and second current mirror circuits, which receive differential outputs of the folded cascode-type differential stages into their respective inputs, with reverse polarity to each other and their outputs connected in common to an output terminal. The folded cascode-type differential stage adds the differential output signal of the first differential pair and the differential output signal of the second differential pair.