youchen
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Posts: 22
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Frank, thanks for your continued help.
I have used the method your introduced in that thread for jitter computation. So, set noise type in 'pnoise' to 'timedomain', then complete the simulation. From Direct Plot, I select 'tdnoise', 'integ output noise', 'total noise' and 'magnitude', and was able to get the RMS noise power at the jitter event time. Dividing that by slew rate, I obtained the jitter amount, which seems very reasonable. However, one thing confuses me is the units of measure for 'magnitude' shown in Direct Plot. I thought it should be 'V', not 'V/sqrt(Hz)', because the slew rate is by default 'V/s' so that the division would give 's' for jitter amount. Why is it shown as 'V/sqrt(Hz)'?
Then, to confirm my jitter amout, I set noise type in 'pnoise' as 'jitter'. And I suppose that I should get the same jitter amount as before. Afer simulation, in Direct Plot, I select 'pnoise jitter', 'Jee' and it gives the jitter spectral density after clicking Plot. However, it did not give me the 'Jee' amount, as claimed in page 30 of the application note you gave me in last reply. Also I checked 'Jc' or 'Jcc', clicking Plot did not give any value either. What may be the problem? Thanks.
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