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noise simulation of the mixer (Read 955 times)

nxing

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noise simulation of the mixer
Jul 10^th, 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

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pancho_hideboo

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Re: noise simulation of the mixer
Reply #1 - Jul 12^th, 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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