Efficient identification of major contributions to EMI-induced rectification effects in analog automotive circuits

Abstract

Rectification is a major cause of failure in EMC susceptibility measurements of analog automotive circuits. Especially charge pumping, the change of a DC operating point due to interference, is a harmful effect. In this paper, a methodology is proposed that gives an estimate of the DC voltage shifts caused by conducted interference with relation to frequency, as well as the contributions of each device. This way, the designer can identify the effects and underlying causes of rectification easily and quickly. The approach is much faster than traditional transient analysis, and time complexity is independent of the frequency of the electromagnetic interference