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Varactor Gamma

Discussion in 'Electronic Design' started by redhat, Jul 5, 2005.

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  1. redhat

    redhat Guest

    can gamma ( grading coefficient ) be calculated as it is not available
    in the datasheet of SMV1104-34 varactor
  2. Andrew Holme

    Andrew Holme Guest

    I found this in an old s.e.c post:

    The effective capacitance of a varicap is given by the formula:

    Ct = Cp + C0 / ((1 + Vr/phi)^gamma)

    Where Cp = package capacitance
    C0 = junction capacitance at zero volts
    Vr = reverse bias in volts
    phi = contact potential (approx 0.6V)

    If you have some values for Ct versus Vr, you could calculate gamma.
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