Patent ID: 8659309
Filing Date: 2014-02-25
Classification: G01R

Abstract:
1. A mixed signal integrated circuit comprising: an input analog pre-processing block configured to receive an input analog signal at an input and configured to perform analog pre-processing on an analog input signal having a first set of specified characteristics, and with analog processing block configured to output a pre-processed input analog signal; an analog to digital converter (ADC), coupled to the input analog processing block, configured to convert the pre-processed input analog signal to an input digital signal; a digital signal processing (DSP) core, coupled to the digital converter, to process said input digital signal to provide a digitally processed digital signal having a second set of specified characteristics; a digital to analog converter (DAC), coupled to DSP core, to convert said digitally processed digital signal to an output analog signal, with the analog output signal having the second set of specified characteristics; an output analog post-processing block configured to receive the analog output signal at an input and configured to post-process a received analog signal having the second set of characteristics and to output the analog output signal at an output; a self test circuit comprising: a digital signal generator for generating a digital test signal having the second set of characteristics to be provided to said DAC; a feedback loop to selectively connect said output to said input in feedback and with the feedback loop having an analog processing block to convert the analog output signal having the second set of characteristics to an analog input signal having the first set of characteristics; and a digital signal comparator to compare a digital signal downstream of said ADC to an expected digital signal resulting from said digital test signal.