Digital Suppression of EMI-Induced Errors in a Baseband Acquisition Front-End including Off-the-Shelf, EMI-Sensitive Operational Amplifiers

In this paper, the susceptibility to Electromagnetic Interference (EMI) of an analog signal acquisition front-end (AFE) due EMI distortion in opamp-based pre-conditioning amplifiers is addressed. More specifically, possibility correct EMI-induced errors digital domain by post-processing acquired waveforms discussed and experimentally demonstrated for first time with reference AFE based on EMI-sensitive, off-the-shelf operational mounted a specific test PCB. Extensive experimental characterization presence continuous wave amplitude modulated reveals superior immunity proposed robustness approach.