Davidf

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  • in reply to: Downloading content #16484

    Davidf
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    There is no download button. Is this a ‘java’ issue?

    in reply to: CMOS in Pspice #16483

    Davidf
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    In practice there is little match of empirical parameters in modern models (level 3 was the last one).
    The best bet is to edit the model name in the transistor symbol and provide the model in the .lib later inluded in the spice command file. Hopefully the vendor can provide this model file. For a simple empirical model some basic parameters can be extracted. I believe Baker’s book has some pointers on doing this. Vt can be defined as the Vgs where you get 1uA of current, or 0.1uA, as you prefer, under the particular conditions of Vdd, Temp, etc. gm is roughly the derivative of the id curves when the transistor is operating in saturation, as Vgs is changed. Lambda can be derived from the x-axis intercept (as the Early voltage for a bjt). Gamma is a bit more difficult to derive, but it’s effect is inverse quadratic anyway.

    in reply to: Downloading content #16481

    Davidf
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    Where is the ‘download’ button?

    in reply to: Give your feedback #16344

    Davidf
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    Hi YouSpice, congratulations for the idea, looks very interesting to me and I’m glad to finally have a resource where to find electronic circuits ready for simulation. I hope it will soon grow with more circuits.

    I have a question though: I see there are many designers ranked in home page, what does that mean exactly ? How do they get ranked ?
    Thanks
    Cheers
    Luca
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