Electromagnetic simulation of a bulk current injection test setup for automotive applications

In this paper, electromagnetic (EM) simulation is used to predict the radio-frequency noise induced by Bulk Current Injection (BCI) in the terminations of a CAN-bus. In the analysis, a typical setup for automotive applications is considered and common mode (CM) and differential mode (DM) noise voltages induced across the bus terminations are evaluated by combining EM simulation of the setup with mixed-mode scattering parameter representation of the simulation outputs, and suitable circuit models of the bus terminal networks. The proposed approach can be used to analyze setups with different terminal networks, and allows to quantify the severity of the BCI test by correlating CM-to-DM conversion to the degree of unbalance of the CAN-bus terminal networks.