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 PSP analysis for calculating capacitance looking into the drain of the nfet_rf 

Last post Tue, Dec 18 2012 10:06 AM by Tawna. 3 replies.
Started by Grad Student 18 Dec 2012 09:34 AM. Topic has 3 replies and 1061 views
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  • Tue, Dec 18 2012 9:34 AM

    • Grad Student
    • Not Ranked
    • Joined on Tue, Dec 18 2012
    • Piscataway, NJ
    • Posts 2
    • Points 40
    PSP analysis for calculating capacitance looking into the drain of the nfet_rf Reply

    Hello All,

    I am trying to calculate the value of the capacitance looking into the drain of the transistor using Y11 parameters( imaginary part).  The problem I am getting is "  I get a resonant peak" .  I do not understand why? Can anyone help me with the explanation?  The circuit that I am using is a nfet_rf transistor with 870um width with an inductor of 10nH at the drain with Vdd=1.5V and at the gate Vpulse from 0 to 1.5V at 2.4Ghz.

    Thank you in advance. 

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    • Post Points: 20
  • Tue, Dec 18 2012 9:37 AM

    • Tawna
    • Top 25 Contributor
    • Joined on Thu, Jul 10 2008
    • Snohomish, WA
    • Posts 212
    • Points 5,625
    RE: PSP analysis for calculating capacitance looking into the drain of the nfet_rf Reply

    H Grad Student,

    Why are you using psp, rather than sp analysis?

    Best regards,
    Tawna 

    Best regards, Tawna Wilsey Staff Support AE, Global Customer Support Cadence Design Systems, Inc.
    • Post Points: 20
  • Tue, Dec 18 2012 10:02 AM

    • Grad Student
    • Not Ranked
    • Joined on Tue, Dec 18 2012
    • Piscataway, NJ
    • Posts 2
    • Points 40
    Re: RE: PSP analysis for calculating capacitance looking into the drain of the nfet_rf Reply

    Because , I want to look at the average capcitance for one period( 0-1.5 V at the input, large signal) at 2.4Ghz. Other thing is that it is quick, I just have to divide the Yii(imaginary ) by 2*pi*f to gett he value for C.

     I should get a linear curve w.r.t frequency but instead I am getting a resonance?  

    • Post Points: 20
  • Tue, Dec 18 2012 10:06 AM

    • Tawna
    • Top 25 Contributor
    • Joined on Thu, Jul 10 2008
    • Snohomish, WA
    • Posts 212
    • Points 5,625
    RE: RE: PSP analysis for calculating capacitance looking into the drain of the nfet_rf Reply

    You may want to file a Service Request with Customer Support.

    It’s difficult to say without having a testcase/more information.


    Best regards,
    Tawna

    Best regards, Tawna Wilsey Staff Support AE, Global Customer Support Cadence Design Systems, Inc.
    • Post Points: 5
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Started by Grad Student at 18 Dec 2012 09:34 AM. Topic has 3 replies.