xaxanitsa
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Hello,
I’m trying to estimate the period jitter of a PLL using the period_jitter function from the waveform calculator (Cadence, Virtuoso 6.1.5) while running a transient noise simulation.
I suppose that:
The result obtained using the "sd" output type and binsize=0 is not correct because the average period is calculated taking into account the initial unlocked state. Could you please confirm that?
The result obtained using the "sd" output type and binsize=500 is again not correct because the average period is calculated taking into account the last 500 periods but the sd is calculated taking into account all the periods. Could you please confirm that?
So probably I have to export the results obtained using "plot" output type and binsize=500 to a .csv file and use MATLAB to calculate the stddev over a sample size of 10,000 periods (as specified by the JEDEC standard). Do you agree?
Finally, is it appropriate to use the eye diagram to estimate the phase jitter using samples obtained once the PLL is in lock state?
Best Regards, xaxanitsa
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