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Difference between some dc parameters on spectre user manual

wgtkan

Hello,

I am looking at the spectre user manual for IC6.1 and I see the following parameters:

u: transistor gain no unit given

self-gain: transistor gain with no unit given

fug: unity gain frequency at actual bias in Hz

ft: unity gain frequency at actual bias in Hz

These are given on page 2106 for PSP103 model which I am using. 

I know that in some literature ft which stands for the transit or transition frequency is ten times the fug (unity-gain frequency). How about they and self-gain? Do they mean the same thing?

My Virtuoso version is:

Version IC6.1.8-64b.500.9

Spectre191

Thank you very much in advance.

Parents
  • Andrew Beckett

    It's generally a good idea to reference the name of the manual you're referring to - I guessed you were talking about the Spectre Circuit Simulator Components and Device Models Reference. It's also best to get the version of the manual in the Spectre stream, because the IC stream just contains a snapshot of some of the spectre manuals. Anyway, there's a bit more context in the NXP/CEA Leti documentation for PSP103 - here's one:

    http://www.cea.fr/cea-tech/leti/pspsupport/Documents/psp103p5_summary.pdf

    See Chapter 8 on DC Operating Point output. I believe ft and self_gain may be added by us, but I'm afraid I don't know the details. You should contact customer support if you need to know this. My guess is that they are just aliases for the original parameters, which you could probably confirm with a little experimentation.

    Regards,

    Andrew.

Reply
  • Andrew Beckett

    It's generally a good idea to reference the name of the manual you're referring to - I guessed you were talking about the Spectre Circuit Simulator Components and Device Models Reference. It's also best to get the version of the manual in the Spectre stream, because the IC stream just contains a snapshot of some of the spectre manuals. Anyway, there's a bit more context in the NXP/CEA Leti documentation for PSP103 - here's one:

    http://www.cea.fr/cea-tech/leti/pspsupport/Documents/psp103p5_summary.pdf

    See Chapter 8 on DC Operating Point output. I believe ft and self_gain may be added by us, but I'm afraid I don't know the details. You should contact customer support if you need to know this. My guess is that they are just aliases for the original parameters, which you could probably confirm with a little experimentation.

    Regards,

    Andrew.

Children
  • wgtkan
    in reply to Andrew Beckett

    Hello Andrew,

    Thank you for your response. 

    The manual is "Spectre Circuit Simulator Components and  Device Models Reference Product Version 19.1 November 2019"

    I did some experiment and self_gain and u happen to refer to the same thing but I have to ve very sure. I will contact customer support.

    Thanks so much indeed.

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