Prediction of EMI effects in operational amplifiers by a two input Volterra series model

The authors prescnt a new analytical model that describes the nonlinear behaviour of common CMOS operational amplifiers excited by radio-frequency interference (RFI) added to the input nominal signals. The new model is a valid support to analogue integrated circuit designers since it expresses a relationship between circuit parameters, parasitic elements and the amplitude of the RFI induced output offset voltage of a feedback CMOS operational amplifier. The validity'of model prediction has been verified through a comparison with experimental and computer simulation results.