[SI-LIST] DC converter iEMI simulation with PSpice
- From: jean-pierre bouthemy <jean-pierre.bouthemy@xxxxxxxxxxxxxxxxxx>
- To: si list <si-list@xxxxxxxxxxxxx>
- Date: Fri, 15 May 2009 18:13:58 +0200
Hi,
I am trying to simulate the EMI noise of a DC-DC Forward converter with
Orcad Pspice FFT.
I introduced LISN model between the power source and the converter input
and measure the following voltages with Pspice probe :
* Vlisn+ - Vlisn- : differential noise
* (Vlisn+ + Vlisn-)/2 : common mode noise (due to 100pF stray
capacitance between Mosfet drain and earth ground)
Then I perform FFT on these voltages and change units to Log for both X
and Y.
I can thus look nice differential and common mode noise EMI spectrum,
but I can not get dBµV on my FFT window.
Does anyone of you know how to do so (if possible)?
And is it correct to calculate as follows: Noise (dBµV) = 20*Log(V/1µV) ?
And more genreral question : does it make sense to simulate EMI with a
tool like Spice?
Thank you.
Regards.
Jean-Pierre Bouthemy
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