M
Mike
Guest
I'm trying to design a switch mode power supply of about 1200W. And I'd like
to simulate the noise I should expect to get from this circuit. So I want to
use OrCad Probe to plot out the spectrum in dBuV and compare it with the
requirements of FCC.
I know how to do the FFT. But I'm not sure what signal to FFT. Do I need to
simulate a LISN that is done in actual FCC compliance testing? Or do I
simply do an FFT on the line voltage assuming a small resistance in the
line?
Also, I'd like to plot on the same graph the maximum acceptable FCC noise in
dBuV, one for commercial, one for residential, for comparison purposes. How
do I do that on a plot of dBxx verses frequency?
Thanks.
to simulate the noise I should expect to get from this circuit. So I want to
use OrCad Probe to plot out the spectrum in dBuV and compare it with the
requirements of FCC.
I know how to do the FFT. But I'm not sure what signal to FFT. Do I need to
simulate a LISN that is done in actual FCC compliance testing? Or do I
simply do an FFT on the line voltage assuming a small resistance in the
line?
Also, I'd like to plot on the same graph the maximum acceptable FCC noise in
dBuV, one for commercial, one for residential, for comparison purposes. How
do I do that on a plot of dBxx verses frequency?
Thanks.