Transient Noise Simulation in Spectre

How about:

rms(value(VT("/out") 1.2u))

where 1.2u is the time I want to measure at, and "/out" is the output signal. That does it for me - well, it gives me the RMS of the signal. if you're going to find the RMS of the noise, maybe you want:

rms(value(VT("/out") 1.2u)-average(value(VT("/out") 1.2u)))

This is assuming that the mean of all the runs gives you the signal, and then you're doing the RMS of the variation from the mean.

Regards,

Andrew.

Hello Andrew,

Please, would it be possible to have the same rms as you described just before but not in one time snapshot but across the time. I have also 100 runs of noise transient and I want to see how the rms develops in time.

Thanks a lot - regards - Karel

Hello Andrew,

Please, would it be possible to have the same rms as you described just before but not in one time snapshot but across the time. I have also 100 runs of noise transient and I want to see how the rms develops in time.

Thanks a lot - regards - Karel

Hi Karel,

Unclear what you want - isn't this just rms(VT("/out")) ?

Regards,

Andrew.

Hello Andrew,

Thanks for your reply. No, just rms(VT("/out")) gives different results.

If you take 100 runs of transient noise, you can imagine that as a 2 dimensional array. One axis is time and one axis is an index of each run. Your proposal calculates rms in one direction of the array. It means the rms separately for each run across the time and you get 100 points in the graph. I would like the same but in the second direction of the array. It means the rms separately for each time point across all the runs and to get rms time curve in the graph. In fact we need to transpose the array before the rms calculation.

Thanks,

Karel