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K Stability factor

I use SP analysis in ADE L and draw the KF (stability factor).

The result is different compared to the K factor derived from any known equations (I got the equations from Pozar's book). i.e. I use for example, the Yij parameters and use my own equations for K.

How I can get more information about how KF in SP analysis is calculated in ADE L ?

Thanks,

Hamid

Tawna over 11 years ago

Hi Hamid,
The equations used for K are the standard equations in any well known microwave book.
Let me see if I can figure out how to upload the image. You can also see the information in the SpectreRF User Guide.
Here's the direct link:
http://support.cadence.com/wps/mypoc/cos?uri=deeplinkmin:DocumentViewer;src=pubs;q=/spectreRF/spectreRF13.1/Chap8.html#1065083
best regards,
Tawna
- Kf.jpg
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Tawna over 11 years ago

The reference book: Microwave Transistor Amplifiers - Analysis and Design
author: Guillermo Gonzalez
ISBN-10: 0132543354
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HamidKhatibi over 11 years ago

Hi Tawna Thank you for your response. I actually have used the same equations. Since the results were not the same I used the equations written versus Sij and also versus Yij. Both my results are exactly the same, where as KF given by Sp is not equal to those of mine.
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HamidKhatibi over 11 years ago

More specifically, the point that Gma/Gms switched from one equation to the othe one, is not where KF becomes equal to 1. That was the reason I tried to draw it myself from the equations.
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Tawna over 11 years ago

Hi Hamid,
I suggest contacting Cadence Customer Support for your issue. http://support.cadence.com . The y-axis labels for some of the sp direct plot functions are incorrect (CCR 1083236) but the actual data should be correct from Spectre. I don't believe it's changed in years.
best regards,
Tawna
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Tawna over 11 years ago

One more thing, Hamid...
I doubt there is a bug in the code - but that is always a possibility (which is why I referred you to Customer Support http://support.cadence.com ).
At any rate, it's difficult to speculate without a testcase. And something like this is going to take some time. It's best to get a dedicated AE to look at it. Feeel free to put me on the Case cc list.
best regards,
Tawna
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HamidKhatibi over 11 years ago

Thanks a lot. Unfortunately at Cornell we do not have access to Cadence support :-(
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Tawna over 11 years ago

Hi Hamid,
If you are accessing Cadence software through Cornell, then you are in the University Program. Your dept. chair should know whom the official contact is at your University to get access to Cadence Online Support.
http://www.cadence.com/support/university/Pages/default.aspx

best regards,
Tawna
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