Anish, If you really just want to model crossover distortion in a class-B amplifier, you could use a pair of Rail blocks: [image: image.png]
If you're trying to model the distortion created by a real solid-state amplifier, and not trying to correct it with predistortion, there are a million different models which attempt to accurately characterize distortion in SSPAs: Rapp, Saleh, and Ghorbani seem to be most widely used. They're all pretty simple. Here's a very simple, memoryless model (Ghorbani) implemented as an embedded Python block: https://gist.github.com/bistromath/75d30dd9691fd18211b306db630d8c4f Some basic information about the model can be found here: https://www.mathworks.com/help/comm/ref/memorylessnonlinearity.html Nick On Tue, Jan 25, 2022 at 12:03 PM Wheberth Damascena Dias <whebe...@gmail.com> wrote: > Hello Anish, > > Non-linear power amplifier modeling and pre-distortion is a vast subject. > > If you want to go deep in this matter I would suggest you to take a look > at Baseband polinomial models. > Here a reference I have used some time ago: > https://repositum.tuwien.at/handle/20.500.12708/13980 > > If you just need something quick, you may want to lookout for AM/PM > models, such as the Saleh model. > > Good luck! > > Best Regards > Wheberth Dias > > > > > On Tue, Jan 25, 2022, 20:44 Anish Mangal <anis...@umich.edu> wrote: > >> Hi, >> >> How should I go about modeling the distortion introduced by a class-B >> amplifier stage that clips the signal when its value is below zero? >> >> Example: >> >> I want to combine two FM modulated signals, pass them through this >> "class-B distorter", demodulate them, and analyze the quality of the signal >> produced (compared with the undistorted one). >> >> How should I go about doing it. >> >> Created the flowgraph attached, but this is obviously wrong. :) >> >> -- >> Anish >> >> >> >> >>
