about varactor simulation

Discussion in 'Cadence' started by balakrishna.k @nit calicut, Oct 14, 2008.

  1. balakrishna.k @nit calicut

    balakrishna.k @nit calicut Guest

    can any one help me to simulate varactor in cadence
    i am designig a vco for 880M to 960Mhz ..
    how to choose varactor charactrstics
    and how to see the c-v characterstics .....
    please help me....
     
    balakrishna.k @nit calicut, Oct 14, 2008
    #1
  2. balakrishna.k @nit calicut

    Mobil Guest

    Put a port on the gate of your varactor and run sp simulation, then
    using this equation for capacitance calculation:
    (imag(yp(1 1 ?result "sp")) / real(yp(1 1 ?result "sp"))).
    If you sweep the voltage, you will get the curve you want.
     
    Mobil, Oct 15, 2008
    #2
  3. balakrishna.k @nit calicut

    Mobil Guest

    Sorry, above is the calculation for Q.
    For the cap value, the equation is (imag(yp(1 1 ?result "sp")) / (2 *
    pi * xval(yp(1 1 ?result "sp"))))
     
    Mobil, Oct 16, 2008
    #3
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