nonlinear mosfet ads

Hi,

Im currently designig a Switch Mode Power Amplifier in UMC 0,18 tecnology.

I want to determinate the Vt, Cds, Cgd, resistence on and Ft of a Mosfet Transistor. How can i do it with ADS? What type of Analysis? LSSP? How?

I know that for large signals the typical model of Mos isn't apllied, and there are many discordance in non-linear models.

I appreciate all the help! Thanks

Ricardo

hi,
Cgs and Cgd are nonlinear capacitances, values move with the voltage applied.
You can only find the small signal values of these elements by performing LSSP simulation. You can do this by extracting [Y] parameters of the transistor.

Do you need more information or you know how to compute?

Hi,

im extracting [Y] parameters, using the example project ..\examples\MW_Ckts\LargeSigAmp_prj with my transistor model

Im assuming that Cds=Im(Y22)/2Pi, Cgs=Im(Y11)/2Pi and Cgd=-Im(Y12)/2Pi.

So far i have no problem, anything i will send you a message.

Thank you so much for the reply.

Ricardo

FYI I just heard that Agilent is developing an X-Parameter tester which
will test a large signal device and create a Large Signal model to use
in ADS.

Cheers

it's interesting subject, i'm student in RF design but new! pls, i did not understand how can you extract Y paramters from :

using the example project ..\examples\MW_Ckts\LargeSigAmp_prj

furthermore, i have another pb with message error shown below:

tahb_HB1 : unable to load ATHAB of type model extractor

could you help me pls .......

thx in advance

m

Check out the thesis in Annex. In section 5.5 shows how to extract the parameters using ADS.

I hope in the end of the week post my project here!

About the error i think its something about your netlist file, but im not sure.

Hope i can help you,

Ricardo

hi, thnkx a lot for submitting to me a thesis... i hope that i will find the answer...

thx again

M

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