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pnoise and pac contradiction

radiowaves

 Hi,

First I want to know hoe does spectre compute flicker and thermal noise

1) using a current modelbetween drain and source

2) using a voltage model at the gate

I am using BSIM 4.5 models where doc says both are modled as current source.

Second,

I have simulated noise transfer function of thermal & flicker noise of M1 from RF to IF using pss+pnoise and noise separation. (sideband=+1). Why are they different? I believe both thermal and flicker are modeled as current source and hence transfer function should be same. The transistor model is BSIM 4.5 and noise model is holistic. Is it because contribution from noise source modulation is different for them?

I tried modeling the noise using a current source (red) and use PXF analysis. But the gain is around 150 in contrast with 1.2K from pnoise simulation. Why is pxf resulting in such low value? Is this method of modeling noise  not correct?

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