This article proposes a macromodel to predict the nonlinear behavior of operational amplifiers having their baseband signal affected by out-of-band disturbances, such as those caused by electromagnetic interference. Like any opamp macromodel, the one proposed in this work was developed with the purpose of not sharing neither the technology parameters nor the circuit topology of the real device. Besides the baseband macromodel, the proposed solution comprises a high frequency equivalent circuit that propagates the out-of-band signals, and a nonlinear model to account for their demodulation. The proposed solution is suitable for any SPICE-like simulator. It does not affect the simulation performance, meaning the simulation time, the simulation accuracy and it does not cause any convergence issue. This article shows in detail the macromodel, the method to calculate its parameters as well as its experimental validation, which was obtained comparing the model predictions with the results of the measurements carried out on a commercial device.

中文翻译：

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用于电磁敏感性分析的运算放大器的 SPICE 模型

本文提出了一个宏模型来预测运算放大器的非线性行为，因为它们的基带信号受到带外干扰的影响，例如由电磁干扰引起的干扰。与任何运算放大器宏模型一样，这项工作中提出的宏模型的开发目的是既不共享技术参数，也不共享真实器件的电路拓扑。除了基带宏模型外，所提出的解决方案还包括一个传播带外信号的高频等效电路，以及一个解释其解调的非线性模型。建议的解决方案适用于任何类似 SPICE 的模拟器。它不影响仿真性能，即仿真时间、仿真精度，并且不会引起任何收敛问题。本文详细展示了宏模型，