Is it possible to add Conducted Emissions Limit Lines directly into the FFT?
I already tried to add them as CSV data but the plot window draws only the first horizontal segment.
FFT is a complex number (same as .ac). In Qspice, complex number is expressed as Re,Im format. For example, to specify a point, it should be written as X,Y for X+jY.
Here is an example for your reference. Just beware that
- The dot are connected with a straight line in linear scale, therefore, it is curved in log scale.
- If you change .csv file, and drag and drop into waveform viewer, you must first remove the previous overlay .csv from File > Overlap Simulations. Or you will not see the curve get update.
Thanks for the reply. Just removing the .csv was not enough. I have to recalculate the FFT at least.
I hacked my way around it and wrote a little Python script that accepts the limit values and does a reverse log interpolation to get straight lines in between. Not the most elegant solution, but it works.
CalcConductedEmissionsLimitLines.py (1.7 KB)
1 Like