How can I show two FFTs in common plot?

QSPICE
1

I could show two FFTs in common plot in LTSpice, how do I do it in QSPICE.

2
  1. In waveform viewer, right click → FFT
  2. Add waveforms for FFT, marked in yellow
  3. Click OK

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Best regards

3

Ivan: thanks for the tip, but I don’t get anything in yellow.

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What am I doing wrong

4

I was refering to the picture i attached. You need to click on waveforms that you want to add. Waveforms that you have added you can see in expression tab.

Best regards

5

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6

Thanks. I think I figured it out. I first have to add the waveforms to the time domain display THEN i can view them in the FFT. I switching over from LTSpice and things are a little different.

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