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The usage of the vfreq function in ADE Explorer calculator.

liangqunshan

Hi ,all ！I want to use the vfreq function in ADE Explorer calculator to create a curve similar to the one shown in the image below, but  I encountered some problems.

As shown in the following image，I have already input the function in the buffer area, but when I click the “evaluate the buffer，if scalar ,dsiplay in buffer ,if waveform ,plot” button,  but , there is no corresponding curve generated. Moreover, an error message pops up. Why？

In addition, when using the vfreq function, how should I select the net name? Because after clicking the "Net Name" option and entering the schematic view, I am unable to return to the calculator interface.

What should I do to resolve the above issue?

  • in reply to liangqunshan

    Dear liangqunshan,

    My response to your comments was flagged as spam and hopefully will be released. I also attached a reduced resolution version of the note and a different URL from which you might be able to access the full resolution version.

    Shawn

  • in reply to ShawnLogan

    Dear liangqunshan,

    I do not see my reply yet, so it must have been considered spam. I am attaching the reduced resolution version of the document. Also, with respect to your comment:

    liangqunshan said:
    What I intend to do is to perform a discrete Fourier transform on the waveform of a non-periodic function over a certain period of time to see if it exhibits high magnitude in the high-frequency region. However,I am uncertain about the correctness of such operation and whether there will be significant deviations in the results.

    When you take the discrete Fourier transform of a signal using N samples, you are inherently assuming it is periodic in N. If the N samples do not contain exactly one or more integer periods of the signal (or the signal is not periodic), then you can still take the discrete Fourier transform, but you must understand the implications on the accuracy with which it represents the Fourier components. There are windowing functions you can use to alleviate some of the spectral phenomena that can occur with the results of a discrete Fourier transform of a signal that is not periodic in N samples. As long as you are aware of these and consider them in your analysis, you can perform a relatively accurate analysis of spectral components of a non-periodic signal.

    Shawn0513.fft_summary_liangqunshan_study_100723v1p1.pdf

  • in reply to ShawnLogan

    Dear ShawnLogan !

    Thank you sincerely for your help. I have downloaded the document you provided and I am currently studying it. Once I finish, I will use the DFT function again.

    Thank you again !

    Best regards，

    Qunshan Liang

  • in reply to liangqunshan

    Dear liangqunshan,

    liangqunshan said:
    have downloaded the document

    Great I am happy to read you were finally able to access the note! I hope you find it helpful. Good luck!

    Shawn

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