Circuit and Method for Operating a Circuit

Abstract

The present disclosure relates to a circuit and to a method for operating a circuit. The circuit has a circuit input and a circuit output, and comprises an auto-zeroing amplifier with an amplifier and auto-zeroing circuitry. The auto-zeroing amplifier is operable in an auto-zeroing phase in which the auto-zeroing circuitry is configured to sample an offset signal of the amplifier, the offset signal being indicative of an offset of the amplifier, and an output phase in which the auto-zeroing amplifier is configured to provide an auto-zeroed output signal corresponding to an output signal of the amplifier combined with said sampled offset signal. The circuit further comprises an input chopper electrically connected between the circuit input and an input of the auto-zeroing amplifier, an output chopper electrically connected between the output of the auto-zeroing amplifier and the circuit output, and a control unit configured to control the auto-zeroing amplifier, the input chopper and the output chopper such that, in a time period from the auto-zeroing amplifier entering output phase operation to again entering the output phase operation following the auto-zero phase operation, the sampled offset signal in the auto-zeroed output signal is substantially averaged out at the circuit output.

Dependencies are inferred from the claim text.