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I am using the BodePlot function to plot magnitude and phase of the function below: 

BodePlot[(1 + s/10^6)/((1 + s/10^2)*(1 + s/10^12)), PlotRange -> All]

I got the plots as below. However, I want to see the magnitude and phase of that function for frequencies larger than 10^13 Hz (the red region as in the picture).

Could you tell me how to do that? I tried to modify the PlotRange function as below but it doesn't work.

BodePlot[(1 + s/10^6)/((1 + s/10^2)*(1 + s/10^12)), PlotRange -> {{0.1, 10^15}, {-100, 0}}]

enter image description here

enter image description here

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BodePlot[(1 + s/10^6)/((1 + s/10^2) (1 + s/10^12)), {10, 10^20}]

The second argument should be the frequency range (horizontal axis). If you use PlotRange, that affects the vertical axis, which is not what you want. Refer to the documentation:

?BodePlot

In response to your follow-up request, try these options:

BodePlot[(1 + s/10^6)/((1 + s/10^2) (1 + s/10^12)), {.1, 10^20},
     PlotRange -> {{-150, 50}, {-180, 90}}, Axes -> True, Frame -> False, 
     AxesOrigin -> {{0, 0.1}, {0, 0.1}}]

The thing to understand about the default output of BodePlot is that it plots two graphs, and the vertical scale on each is different; therefore, when supplying plotting options, they must be given as a list.

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  • $\begingroup$ Thank you very much, it works. However, is there a way to make PlotRange works? I tried to make the vertical axis wider range than what the function value but why does it also not work? $\endgroup$
    – emnha
    Commented Sep 17, 2016 at 18:30

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