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https://designers-guide.org/forum/YaBB.pl Simulators >> RF Simulators >> pnoise of an oscillator https://designers-guide.org/forum/YaBB.pl?num=1229578439 Message started by yomnat on Dec 17th, 2008, 9:33pm |
Title: pnoise of an oscillator Post by yomnat on Dec 17th, 2008, 9:33pm Hi, I'm trying to find the phase noise of a current-controlled oscillator using spectre. The controlling current comes from a bandgap-reference, but the reference current itself is modulating at a lower frequency (due to chopping). What is the setup/spectre pss@pnoise setting required do this kind of analysis? Freq(cco) = 1.6GHz Freq(chopping) = 4MHz Regards |
Title: Re: pnoise of an oscillator Post by sheldon on Dec 17th, 2008, 11:20pm Yomnat, It sounds like you want to simulate a VCO, an autonomous circuit, with a driven source, the chopping source. As mentioned in a recent append Spectre RF will support this analysis from MMSIM71. from the thread, http://www.designers-guide.org/Forum/YaBB.pl?num=1227668750 Spectre will support the autonomous QPSS ( and corresponding small signal analyses, like PAC, PXF, PNOISE, etc ) in MMSIM7.1. You can specify a guess frequency for the LO in the GUI, it is very much like what you do for the autonomous PSS simulation. Best Regards, Sheldon |
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