Abstract text

In an example embodiment, an apparatus, such as a two stage operational amplifier, comprising a first stage amplifier having an input and an output, and a second stage amplifier having an input and an output, the input of the second stage amplifier is coupled to the output of the first stage amplifier. A first bias circuit is operable to set a common mode voltage of the first amplifier. A second bias circuit is operable to set a common mode voltage of the second amplifier. A first feedback circuit is coupled to the first bias circuit and the output of the first stage. The first feedback circuit is operable to control the common mode voltage of the first stage amplifier based on the common mode voltage set by the first bias circuit and the output of the first stage amplifier.