Signal acquisition diagnostics

Abstract

Methods and apparatus for a signal acquisition system having a normal mode diagnostic modes. In embodiments, a method includes performing offset cancellation by cancelling the first input signal during an offset diagnostic mode, comparing an output of the amplifier to a first threshold in response to cancelling the first signal, and generating an offset fault when the first threshold is exceeded. In an injection diagnostic mode, a method includes injecting a second signal into the amplifier, combining an output from the amplifier during the injection of the second signal and a reconstructed signal generated from the first signal to generate a combiner output signal, comparing the combiner output signal to a second threshold, and examining a result of the comparison of the combiner output signal and the second threshold to detect a circuit fault.

Dependencies are inferred from the claim text.