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An intermodulation distortion estimation method for linear CMOS circuits
Author(s) -
Baxevanakis Dimitrios,
Alimisis Vassilis,
Sotiriadis Paul P.
Publication year - 2021
Publication title -
international journal of circuit theory and applications
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.364
H-Index - 52
eISSN - 1097-007X
pISSN - 0098-9886
DOI - 10.1002/cta.2961
Subject(s) - intermodulation , cmos , electronic engineering , nonlinear distortion , computer science , distortion (music) , nonlinear system , amplifier , matlab , linear circuit , electronic circuit , spice , python (programming language) , operational amplifier , voltage , topology (electrical circuits) , engineering , equivalent circuit , electrical engineering , physics , quantum mechanics , operating system
Summary 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.