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https://designers-guide.org/forum/YaBB.pl Measurements >> Phase Noise and Jitter Measurements >> pss/pnoise vs transient https://designers-guide.org/forum/YaBB.pl?num=1380047988 Message started by Frank99 on Sep 24th, 2013, 11:39am |
Title: pss/pnoise vs transient Post by Frank99 on Sep 24th, 2013, 11:39am hi, I am running simulations on a crystal oscaillator to verify the period jitter using a few different approach. A. running pss and pnoise td gives Jc[1k] rms=50fs, peak2peak_BER=10e-3]=300fs B. running long transient simulation and using the built-in period_jitter function gives 300fs C. using the same transient data and plot eye diagram. use crosshair to measure the width of the rising(or falling) edge gives 30fs. i initially thought result from A and B and C should all agree but now i have doubt. question 1. result A and B matched, but I was told pss/pnoise uses device noise where as transient (default) does not have device noise in the model. is this true? if so how do i get the device noise into a transient simulation? 2. B and C uses the same data, and i expected the result to match. Any idea as to why? 3. is there any other way to verify the period jitter again pss/pnoise other then transient 4. (unrelated) in the noise summary, the strobe noise sim provides noise at a particular threshold. however in the noise summary from a pnoise type=source, it only provide a single number. user guide says this noise summary is an average noise over the cycle. any idea on what the formula is? thank you very much for your help. Frank |
Title: Re: pss/pnoise vs transient Post by specialest on Dec 1st, 2014, 5:23pm have the same question here. I simulate crystal oscillator and squaring buffer together. Lots of questions in different simulation approaches. |
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