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System-level SPICE model for predicting the effects of external incident EMI on a shielded communication system with an antenna

System-level SPICE model for predicting the effects of external incident EMI on a shielded communication system with an antenna

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A system-level SPICE model is proposed to predict the effects of external incident electromagnetic interference (EMI) on a shielded communication system with an antenna in this study. First, hybrid techniques are incorporated to develop a frequency-domain equivalent circuit model for the electromagnetic (EM) coupling of the system. The system is divided into an external subsystem and an internal subsystem. A receiving equivalent circuit model is established using the Lorentz reciprocity theorem for the EM coupling of the external subsystem. A transmission equivalent circuit model is established using the segmentation method for the signal transmission in the internal subsystem. Then, in order to handle the non-linear or time-varying circuit devices in the system, the macromodelling technique is employed to convert the frequency-domain equivalent circuit model into a time-domain system-level SPICE model. Both numerical simulation and experimental verification are carried out to validate the proposed model. Based on the system-level SPICE model, bit error rate is calculated to evaluate the performance of the communication system under external incident EMI in the ADS simulator.

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