An intermodulation distortion estimation method for linear CMOS circuits,International Journal of Circuit Theory and Applications

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An intermodulation distortion estimation method for linear CMOS circuits
International Journal of Circuit Theory and Applications ( IF 1.8 ) Pub Date : 2021-03-30 , DOI: 10.1002/cta.2961
Dimitrios Baxevanakis ₁ , Vassilis Alimisis ₁ , Paul P. Sotiriadis ₁

Affiliation

This article presents a general, time‐domain method for intermodulation distortion estimation that offers a fast, systematic, and compact formulation. It can be applied to any linear CMOS circuit architecture, with any number of stages, ranging from amplifiers and transconductors to filters, that are characterized by weakly nonlinear behavior. Each CMOS stage of the circuit is modeled as a G_m‐stage with an output current expressed as a more involved function of its input and output voltages, taking into account both powers and cross‐product terms necessary to accurately capture the nonlinear behavior. The proposed method is easily implemented in numerical computing environments like MATLAB or Python and results in a very fast distortion estimation. A number of example topologies simulated in Cadence Spectre illustrate the application of the method and demonstrate its accuracy.

中文翻译：

线性CMOS电路的互调失真估计方法

本文介绍了一种通用的时域互调失真估计方法，该方法提供了一种快速，系统和紧凑的公式。它可以应用于任何线性CMOS电路架构，具有从放大器，跨导体到滤波器的任何数量的级，其特征是具有弱非线性特性。电路的每个CMOS阶段均建模为G _m阶段，将输出电流表示为其输入和输出电压的更复杂函数，同时考虑到精确捕获非线性行为所需的功率和叉积项。所提出的方法很容易在像MATLAB或Python这样的数值计算环境中实现，并且可以非常快速地估计失真。在Cadence Spectre中模拟的许多示例拓扑说明了该方法的应用并证明了其准确性。

更新日期：2021-04-23

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