Patent ID: 8339195

Claim:
A circuit comprising: an amplifier having an input and an output, wherein the input has a first input and a second input and the output has a first output and a second output; and a first offset injection circuitry coupled to the first input and the first output of the amplifier and a second offset injection circuitry coupled to the second input and the second output of the amplifier, each of the first and second offset injection circuitries comprising: an offset detection circuit configured to detect an offset of the amplifier at one of the first and second outputs of the amplifier; and an offset generation circuit having an input coupled to the offset detection circuit and an output coupled to one of the first and second inputs of the amplifier configured to generate an offset at one of the first and second inputs of the amplifier during an operational phase of the amplifier based on the detected offset; wherein the generated offset from one of the first and second offset injection circuitries is configured to cancel at least a portion of the offset of the amplifier.