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Kf parameter testing in spectre under non standart conditions

robert 21

Hello, i need to test the  parameter Kf under some conditions in subthreshold.i cannot just plot the OP param,becasue i need to derive it under certain conditions.

Spectre(of Cadence) like BSIM(of Berkley) has developed a method for deriving each parameter in their model.

Is there a way to help me with such manual where i can test in cadence virtuoso the Kf parameter shown in the formula bellow?

Thanks.

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  • Andrew Beckett

    I do love it how you've posted an equation with absolutely no context. It would probably increase the likelihood of an answer if you can ask a decent question in the first place with sufficient information that somebody can stand a chance of answering it.

    Luckily I recognised it as likely to be related to flicker noise modeling, and it corresponds to equation 21-142 in the BSIM4 chapter of the Spectre Circuit Simulator Components and Device Models Reference assuming that AF=2 (the default value is 1), and EF=1 (that's the default). The parameters AF, EF, and KF are model parameters for various device models (including BSIM4). From "spectre -h bsim4" you'll see:

    438 af=1.0 Flicker noise exponent.
    439 ef=1.0 Flicker noise frequency exponent.
    440 kf=0.0 A^(2-EF)*s^(1-EF)*F   Flicker noise coefficient.

    Spectre will output any model parameters into the models database - or you can just look in the model definition to see the parameters - they are not computed. So it's nothing to do with the region the device is operating in.

    Andrew

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  • Andrew Beckett

    I do love it how you've posted an equation with absolutely no context. It would probably increase the likelihood of an answer if you can ask a decent question in the first place with sufficient information that somebody can stand a chance of answering it.

    Luckily I recognised it as likely to be related to flicker noise modeling, and it corresponds to equation 21-142 in the BSIM4 chapter of the Spectre Circuit Simulator Components and Device Models Reference assuming that AF=2 (the default value is 1), and EF=1 (that's the default). The parameters AF, EF, and KF are model parameters for various device models (including BSIM4). From "spectre -h bsim4" you'll see:

    438 af=1.0 Flicker noise exponent.
    439 ef=1.0 Flicker noise frequency exponent.
    440 kf=0.0 A^(2-EF)*s^(1-EF)*F   Flicker noise coefficient.

    Spectre will output any model parameters into the models database - or you can just look in the model definition to see the parameters - they are not computed. So it's nothing to do with the region the device is operating in.

    Andrew

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