# Get the output of a square-wave input?

Posted 5 years ago
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 Hello! I am trying to get the electrical response of a system to an input square wave. Here is the code: ClearAll["Global*"]; Rf = 10^7; A = 10000; \[Omega]pd = 2 Pi 100; \[Omega]gbp = A \[Omega]pd; \[Tau] = 1/\[Omega]pd; Cj = 10^-12; Cf = 10^-12; H[s_] = A/(A + (Cf + Cj) Rf \[Tau] s^2 + s (A Cf Rf + Cj Rf + \[Tau])); BodePlot[TransferFunctionModel[H[s], s]]; T = 2*10^-5; TMAX = 4*10^-5; in = OutputResponse[TransferFunctionModel[1, s], SquareWave[t/T], {t, 0, TMAX}]; out = OutputResponse[TransferFunctionModel[H[s], s], SquareWave[t/T], {t, 0, TMAX}]; Plot[{in, out}, {t, 0, TMAX}, PlotRange -> {0, 2}] This works well, but if I put Rf = 10^6; instead of 10^7, I get this error: At t == 9.999999999999726*^-6, step size is effectively zero; \ singularity or stiff system suspected. >> Thanks for the help!
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Posted 5 years ago
 I just ran your code with Rf=10^6 and no error was produced. Which version are you using? See the image below generated with version 11 on a MAC computeryehuda