METHODS AND APPARATUS FOR A MULTI-MODE ANALOG-TO-DIGITAL CONVERTER

摘要

A multi-mode analog-to-digital converter (100) includes a delta-sigma analog-to- digital converter circuit configured to receive the analog input (102) and produce a digital bit- stream (140) associated therewith, the delta-sigma analog-to-digital converter including at least one integrator configured to reset to an initial state in response to a reset signal. A digital filter circuit is configured to receive the digital bit-stream and produce two filtered outputs derived from the digital bit-stream. During one mode (e.g., a DC mode) the delta-sigma analog-to-digital converter circuit is configured to receive the reset signal and produce the digital bit-stream for a predetermined number of clock cycles, and the digital output corresponds to the first filtered output. In another mode (e.g., an AC mode), the delta-sigma analog-to-digital converter is configured to continuously produce the bit-stream, and the digital output corresponds to the second filtered output.