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https://designers-guide.org/forum/YaBB.pl Simulators >> RF Simulators >> Pnoise Simulation Puzzels https://designers-guide.org/forum/YaBB.pl?num=1249583626 Message started by lunren on Aug 6th, 2009, 11:33am |
Title: Pnoise Simulation Puzzels Post by lunren on Aug 6th, 2009, 11:33am Dear All, Today I used Pnoise to simulate the current noise of a PFD+Charge_Pump. The setting for pnoise is: pnoise pnoise sweeptype=absolute start=10 stop=10G + maxsideband=50 oprobe=V1 iprobe=V2 refsideband=0 + annotate=status The results seems resonable. However, if I set start=0 ( I read the paper by key: Simulating Swiched-Capacitor Filterss by SpectreRF, he set start=0), the results seems abnomal. Attached please find the simulation results. The red curve corresponds start=10, the green curve corresponds start=0. Any commends are welcome. |
Title: Re: Pnoise Simulation Puzzels Post by Forum Administrator on Aug 10th, 2009, 10:01am What is M0 and M1? -Ken |
Title: Re: Pnoise Simulation Puzzels Post by lunren on Aug 10th, 2009, 2:34pm M0 and M1 mean nothing. They are just the names of markers (the plots are produced with WaveScan, if I use AWD, they should be "A" and "B"). Ken, I need your feedback about this question. Another quick question is: When I simulate the current noise of PFD+CP, I tie ref_clk and div_fb together (simulate the locked state), does this make sense? The sweep type of PNOISE was set to absolute, is this right? Thanks, Lunren |
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