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Multi frequency AC analysis, how ?

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kavea

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Hi,
I'm wondering how to simulate a circuit at different frequencies with different amplitudes, for example at 1MHz with 1V, at 2MHz with 3V source etc. Since there are a lot of frequencies i can't change amplitude and frequency of a single tone voltage source manually. I need some kind of frequency dependent voltage source.. Does anyone know how to proceed in this case ? I use LTSpice and Ansoft Designer simulators
 

erikl

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  • You can superimpose (i.e. put in series) several ac voltage sources with different frequencies and voltages
  • Or you can use an FM ac source and modulate it with a (lower) frequency spectrum
  • You can sweep the frequency of an ac voltage source during an ac analysis (but only with constant voltage, and only analysing the current frequency)
 

crutschow

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You can use the .step function to step the param F.
Then replace the numerical frequency value in the sine Voltage Source with "{F}".
Look at the help for for .step to see how it works.
 

kavea

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And what about Harmonic Balance analysis ?
 

Borber

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Single frequency and constant amplitude are parameters from time domain analysis.
 

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