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s-params in spice - what's 3D

Discussion in 'Electronic Basics' started by jw, Apr 24, 2004.

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  1. jw

    jw Guest

    Hi,

    I'm just reading an article that says you can include s-parameters in a
    spice model by first converting them to y-parameters, & etc. So I want to
    try this. But I don't understand his equations, so maybe I can get some
    help.

    To convert the parameters it says to do:

    y11=3D((1-s11)*(1+s22) .......
    y12=3D-2*s12 .....

    and so on. So my question is what is "3D"?

    I have searched for this but can't find any info, is this a key symbol or a
    function or what?

    TIA, jw


    I know this is not a beginner question, but I don't have access to
    sci.electronics so I posted here.
     
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