Patent ID: 8624668

Claim:
A system for improving common-mode response of an auto-zero amplifier, the system comprising: a first offset-storage element for storing a first value corresponding to a first common-mode level of an input signal; a second offset-storage element for storing a second value corresponding to a second common-mode level of the input signal; a main amplifier for amplifying the input signal, the main amplifier receiving an offset-correction signal, generated based on the first value, for cancelling an offset at the first common-mode level; control logic for detecting a transition in the input signal from the first common-mode level to the second common-mode level; and a switch for, upon detection of the transition, severing a first connection to the first offset-storage element and creating a second connection to the second offset-storage element, thereby generating the offset-correction signal using the second value instead of the first value.