amplifying signals in switched capacitor environments

1. Field of the Invention An amplification circuit sharing a main amplifier in two gain stages while minimizing power consumption. A Miller Compensated Amplifier contains the main amplifier and a pre-amplifier, with the output of the pre-amplifier being connected to the input of the main amplifier. In a first gain stage, the two amplifiers together amplify an input signal. The main amplifier is then disconnected from the pre-amplifier in a second gain stage to further amplify the amplified signal of the first gain stage. A capacitor is configured to act as a compensation capacitor of the main amplifier in the first gain stage, and as a sampling capacitor in the second gain stage. The amplifier circuit may be implemented in an ADC of a digital camera.