Apparatus for controlling comparator input offset voltage

摘要

An apparatus to remove an input offset voltage of a comparator circuit includes an input voltage offset capacitor, control logic to charge and discharge the capacitor to provide an offset cancelation voltage. The offset cancellation voltage removes the input offset voltage of the comparator dependent upon an output of the comparator circuit. A switching arrangement controlled by the control logic switches signals between the capacitor and the control logic.

主权项

1. An apparatus to remove an input offset voltage of a comparator circuit, comprising:
an input voltage offset capacitor; control logic operable to charge and discharge the capacitor to provide an offset cancelation voltage to remove the input offset voltage of the comparator circuit dependent upon an output of the comparator circuit; and a switching arrangement operable under control of the control logic to switch signals between the capacitor and the control logic, wherein the capacitor removes the input offset voltage of the comparator circuit by altering the body bias voltage of one of a plurality of input transistors of the comparator circuit.