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https://designers-guide.org/forum/YaBB.pl Simulators >> RF Simulators >> noise simulation of the mixer https://designers-guide.org/forum/YaBB.pl?num=1184111670 Message started by nxing on Jul 10th, 2007, 4:54pm |
Title: noise simulation of the mixer Post by nxing on Jul 10th, 2007, 4:54pm Hi there, I have a question about the noise simulation, from the Cadence tutorial, there are three ways to simulate the mixers NF: PNOISE with a DC input at RF port, the PSP following a PSS and QPNOISE following QPSS. I am wondering which one is more accurate? Even from the tutorial, I can see that the simulation results from the former two are different. Thanks nxing |
Title: Re: noise simulation of the mixer Post by pancho_hideboo on Jul 12th, 2007, 10:47pm Hi. If you simply evaluate NF of mixer in same situation as using actual instruments such as Agilent N8975A NFA Series Noise Figure Analyzer or 8970A, use PSS/Pnoise or PSS/PSP with DC input as RF input where only LO is large signal. In this case both PSS/Pnoise and PSS/PSP give you same results unless you set wrong setting in simulation. If you study an effect of NF degradation due to RF compression or desentitization, use QPSS/QPnoise or QPSS/QPSP with large RF input. |
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