On the susceptibility of analog circuit to EMI

This chapter deals with the effect of electromagnetic interference on the operation of analog front-end like operational amplifier and switched capacitor circuits. In particular, the offset, which is generated in the input differential stage of an operational amplifier is evaluated by an analytical model and a new circuit topology immune to RFI is proposed. Furthermore, the distortion of RFI in a basic switched capacitor circuit is analyzed and a new simple model for MOS switches is derived. Such a model is employed to predict RFI-induced upset in complex SC circuits.