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Pnoise is giving me wrong results (Read 24 times)
iVenky
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Silicon Valley
Pnoise is giving me wrong results
Apr 23rd, 2016, 10:24am
 
I am running pnoise for a VCO that I built for 3 different values of resistors. Those resistors are placed after an ideal vcvs so that changing that value shouldn't change anything; bottom line is that I am not expecting to see any change in the pnoise results because of this. Now, I am including the pnoise results with this post.

As you can see, for one case, the pnoise gives me a different result near the minimum frequency that I have specified which is 1 kHz.
I looked at the spectre.out file and found that in that case (first resistor), the estimated line width turned out to be different. Could you please explain me why this change occured, as I am not expecting any change?

Here's the link to spectre.out
https://drive.google.com/file/d/0B7_0oRjalPc5ZXFKa1Eta25wWlk/view?usp=sharing
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pnoise_results_cm_001.JPG
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