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Simulators >> RF Simulators >> sampled pnoise sim to multi-phase circuit
https://designers-guide.org/forum/YaBB.pl?num=1634514844

Message started by jyan on Oct 17^th, 2021, 4:54pm

Title: sampled pnoise sim to multi-phase circuit
Post by jyan on Oct 17^th, 2021, 4:54pm

hi all,
I have one question about the sampled pnoise simulation:
If I have a switched capacitor sample and hold circuit to sample the noise of resistor R, and now I add another switch sampler just paralleled with the first switch, with same sampling freq (fs) but nonoverlapping. so, the pss fund. freq = fs, but essentially the switch freq is 2fs.
how can simulate the circuit to get the right noise density (4kTR*pi/2*f3db/fs), instead of 4kTR*pi/2*f3db*2/fs?
thanks
Jeff

Title: Re: sampled pnoise sim to multi-phase circuit
Post by jyan on Oct 18^th, 2021, 10:32am

I found there is a pnoise option sampleratio can be used here.
sampleratio is the parameter to define a sample rate ratio to fund. freq