Hi, All,
I am trying to use the method introduced by "Ken Kundert" to simulate the noise of switch-capacitor using SpectreRF. I noticed that the ideal sample-and-hold is written in verilogA. Based on my understanding, this ideal sample-and-hold serves two purpose: a) provide negative feedback to the integrator input to achieve steady-state operating condition during pss simulation, b) serves as an open circuit during pnoise simulation such that this feedback don't affect the overall noise analysis? ( it is very analogous to the way we put large inductor in the feedback path to bias and opamp during ac/noise analysis).
Can anybody told me whether my understanding is correct or not?
If my understanding is right, can I use some components in the "analogLib" to build an ideal sample-and-hold to achieve the same purpose? I found it is very hard to find an "open" for the pnoise analysis.
Thanks a lot.
link to the paper i am referring to:
http://www.designers-guide.org/analysis/delta-sigma.pdfAlso I found there are several points in this paper I couldn't understand. If anybody is also studying this paper and want to have some discussion, please feel free to contact me.
Thanks and cheers ;D.