Self-testing of an analog mixed-signal circuit using pseudo-random noise

摘要

A method embodiment includes combining a control signal of a voltage regulator circuit of an apparatus with pseudo-random noise, and using the control signal to provide an output voltage signal as attenuated by a power supply rejection ratio (PSRR) of an analog mixed-signal (AMS) circuit of the apparatus. The method further includes self-testing the AMS circuit by cross-correlating a signal indicative of the output voltage signal from the AMS circuit with the pseudo-random noise and, in response, assessing the results of the cross-correlation relative to a known threshold indicative of a performance level of the AMS circuit.