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I don't show a w(1/f3) corner frequency in pnoise (Read 4016 times)

jjun2003

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I don't show a w(1/f3) corner frequency in pnoise
Oct 14^th, 2003, 4:20am

I'm a beginner who design a LC-VCO.

I want to show w(1/f3) corner frequency at VCO.

But, when I simulate a VCO through pss @ pnoise, I see a phase noise( -20dBc/Hz at decade) exept this frequency(-30dBc/Hz).

I am using a BSIM3v3 MOSFET model.

How can I show this frequency?

Is NOT inluded flicker noise model in the BSIM3v3? ???

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Ken Kundert Global Moderator Offline Posts: 2384 Silicon Valley	Re: I don't show a w(1/f3) corner frequency in pno Reply #1 - Oct 14^th, 2003, 5:39pm You have to specify a value for the flicker noise parameter, kf, on your MOS model. -Ken
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jjun2003

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Some more Question.....about KF
Reply #2 - Oct 14^th, 2003, 9:43pm

Thank you for your replying. ^^

I found flicker noise parameter' table in process files after your replying.

But, I don't know how to use this parameter.

It is a part of the table.

*Table of AF, KF for W/L at each bias (Freq.=100Hz)
//*-----------------------------------------------------------------
//* NMOS (W/L) PMOS (W/L)
//*-----------------------------------------------------------------
//*Vbs Vgs Vds Sid AF KF Sid AF KF
//* V V V A^2/Hz - V^2*F A^2/Hz - V^2*F
//*-----------------------------------------------------------------
//*0.0 0.5 0.1 3.35E-19 0.863 3.01E-24 5.20E-22 1.644 4.79E-23

My question is KF parametr's applying method for simulating Phase Noise.

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Ken Kundert

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Re: I don't show a w(1/f3) corner frequency in pno
Reply #3 - Oct 15^th, 2003, 1:42am

Both KF and AF are flicker noise parameters. For this table it appears as if ...
For NMOS: af=0.863 kf=3.01E-24
For PMOS: af=1.644 kf=4.79E-23
I am not familiar with sid, though the size of its value is consistent with it being a noise power.

af and kf have nothing to do with phase noise per see. Rather, they specify the flicker noise. The phase noise results because the devices are used within an oscillator.

-Ken

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