Patent ID: 9654091
Date: 2017-05-16
CPC Classifications: H03K

Claim:
1. A comparator, comprising: an input stage comprising resistor-coupled source-follower circuitry that converts a differential input voltage into differential current independent of an operating region of transistors used to implement the source-follower circuitry; hysteresis current-injection circuitry that injects hysteresis current into the differential current generated in the input stage to add hysteresis voltage to operations of the comparator, wherein the hysteresis voltage is independent of the operating region of the transistors used to implement the source-follower circuitry; an output stage that processes the differential current provided by the input stage to control an output of the comparator; and a common-mode (CM) detection circuit that inhibits differential current in the input stage from reaching the output stage if a CM voltage of the differential input voltage is substantially close to a voltage rail of the comparator.