Pspice help! non linear current generator

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    mkthom81
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    Hello to everybody!
    i’m designing a little circuit on Pspice with a Mosfet.
    I need help because i need to put a current generator with this equation: (i’m trying to design a floating gate mos with tunneling effect given by Ifn):
    Ifn= +- Atox*Afn*(Etox)^2exp(-Bfn/Etox)
    where Etox=(Vd-Vfg)/dtox
    dtox, Atox,Afn, bfn are known values.
    I dont know how i can crate this current generator and how if its possibile put this equation.
    help me!!!
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