Effects of RFI in switched capacitor circuits

In the last few years, the level of electromagnetic interference (EMI) has significantly increased and unwanted radio frequency (RF) voltages and currents are almost always superimposed onto nominal signals in any integrated circuit Analog and digital integrated circuits are widely used in equipment operating in electromagnetic polluted environments such as in automotive, aeronautic and industrial systems. The errors which are induced by radio-frequency interference (RFI) in switched-capacitor (SC) circuits are discussed and the main role played by the distortion of MOS switches in the on-state is highlighted. Furthermore, a new simple analytical model, which enables one to predict RFI-induced errors in SC circuits is proposed and it is validated by the comparison of its predictions with time-domain computer simulation results.