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  1. #1
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    FFT algorithm in Pspice

    Hi Guys,


    I'm simulationg a circuit in Pspice and parallel trying to calculate it in Mathcad.

    I have tested the FFT in Pspice and the cfft in Mathcad and there is a difference in the amplitude, so the scaling.

    The one in Mathcad is scaling with 1/n I think. Can you tell me what expression does Pspice use for the FFT?
    or explain why i Have such different results? normally even if the sampling step is different I schould have the same Amplitude in the same Frequency..no?


    Thank you very much

    •   Alt14th June 2012, 15:22

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  2. #2
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    Re: FFT algorithm in Pspice

    PSpice does not use any scaling. i.e. a pure sinusoidal wave for "F" Hz and peak amplitude "A ", would generate FFT with fundamental component at F Hz and peak value of this component "A"
    Hope this helps.
    The road of life twists and turns and no two directions are ever the same. Yet our lessons come from the journey, not the destination. ~ Don Williams, Jr.



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