Conduction Immunity Modeling Approach for Nonlinear IB Module Based on Multi-Harmonic Distortion Theory in Analog-Digital Integrated Circuit (MADIC)

Abstract

The existing chip RF conduction immunity modeling method, integrated circuit immunity model conducted immunity (ICIM-CI), in mixed analog-digital integrated circuit (MADIC) is restricted by insufficient model nonlinearities, including large deviations between predictions and actual circuit performance under specific conditions, and the inability to carry out cascade quantization sensitivity simulations. This study presents an improved ICIM-CI modeling method, called ICIM-CI (nonlinear immunity behavior-NIB), which incorporates the concept of poly-harmonic distortion (PHD) to account for the conduction sensitivity of ICIM-CI in MADIC. This novel approach involves introducing multi-harmonic nonlinear coefficients into the immunity behavior (IB) module of the conventional ICIM-CI model, resulting in enhanced nonlinear characteristics of the IB module. The conventional ICIM-CI model can be improved from a binary judgment result model to a cascade simulation model with a nonlinear quantized output response. The proposed method can generate a broadband model on the conduction immunity of the chip in the frequency domain, and it supports cascade simulation. Measurements on a standard chip showed that compared with the traditional ICIM-CI method, the normalized root-mean-square error of this method is improved by 18.5 dB, while the modeling time is reduced by about 98%.