Patent ID: 7379002
Filing Date: 2008-05-27
Classification: H03M

Abstract:
1. A multi-mode analog-to-digital converter configured to receive an analog input and produce a digital output corresponding to the analog input, comprising: a delta-sigma analog-to-digital converter circuit configured to receive the analog input and produce a digital bit-stream associated therewith, the delta-sigma analog-to-digital converter circuit including at least one integrator configured to reset to an initial state in response to a reset signal; and a digital filter circuit configured to receive the digital bit-stream, the digital filter circuit configured to produce a first filtered output and a second filtered output derived from the digital bit-stream; wherein, during a first 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 wherein the digital output corresponds to the first filtered output; and wherein, during a second mode, the delta-sigma analog-to-digital converter circuit is configured to continuously produce the digital bit-stream, and wherein the digital output corresponds to the second filtered output; wherein the first and second modes are selectively activated such that the first mode is active when the analog input is a DC signal, and the second mode is active when the analog input is an AC signal.