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Simulators >> RF Simulators >> I don't show a w(1/f3) corner frequency in pnoise
https://designers-guide.org/forum/YaBB.pl?num=1066130403

Message started by jjun2003 on Oct 14^th, 2003, 4:20am

Title: I don't show a w(1/f3) corner frequency in pnoise
Post by jjun2003 on 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? ???

Title: Re: I don't show a w(1/f3) corner frequency in pno
Post by Ken Kundert on Oct 14^th, 2003, 5:39pm

You have to specify a value for the flicker noise parameter, kf, on your MOS model.

-Ken

Title: Some more Question.....about KF
Post by jjun2003 on 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.

Title: Re: I don't show a w(1/f3) corner frequency in pno
Post by Ken Kundert on 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