System and method for analog-to-digital conversion

摘要

A system and method for converting an analog signal to a digital signal is provided including a first circuit ( 22 ) having a signal range and an input for receiving a first signal, and a second circuit ( 24 ) having an input receiving the analog signal and a first output coupled to the input of the first circuit. The first circuit ( 22 ) includes an amplifier ( 28 ). The first circuit ( 22 ) samples the first signal and produces the digital signal from the first signal using the amplifier. A second output of the second circuit ( 24 ) is coupled to the amplifier ( 28 ). The second circuit ( 24 ) samples and scales the analog signal via the amplifier ( 28 ) to produce the first signal within the signal range and cancels an offset of the first signal. The system and method reduce power consumption and save device area.