Hi,

I'm using PNoise to simulate charge pump output noise current. As expected, there are 1/f noise and white noise coming out from devices so when charge pump is in its on (for very short time) and off (for most of the time) state, we're effectively sampling the output noise (neglecting off noise). So in PSS, there is "# of harmonics" and in PNoise, there is "Max sideband". If I want the simulation to be accurate, I'd need to set the # of harmonics and Max sideband to very large (since the die-off of sinc function for my short sampling pulse is really slow over freqency and up to 1GHz) and if my sampling frequency is only 1MHz that would be up to 1000 sidebands and harmonics. Am I correct on this?

Here is what I think: since white noise is flat over frequency, the overfold of such noise would be significant even from far away harmonics. Does PNoise smart enough to handle white noise and 1/f noise independently so that I don't need to simulate up to so many harmonics? Would the high harmonics/sidebands slow down PSS and PNoise calculation?

Thanks,
William

Thanks Ken, that's a really good paper on sampled noise and the using of PNoise.

William