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How to calculate input equivalent capacitance of 2 ports network.

Duy Hien

Hi everyone,

I am a newbie in Cadence spectre simulator. I have a two ports network and I try to plot the input equivalent capacitance vs. frequency. In ADS I use equation: Cin = imag(Y11)/(2*pi*freq). But I don't know how to insert that equation into Cadence. I only used basic SP analysis. I have read many thread but I think those answers is for who is quite familiar with spectre.

I use Cadence IC6.1.5.

Please give me a detail direction. I really appreciate your instruction. Thank in advanced. 

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  • Andrew Beckett

    Assuming you're using IC615 ISR12 or later, you can do this in the calculator using:

    imag(ypm('sp 1 1))/(2*pi*xval(ypm('sp 1 1)))

    I got the ypm part by using the Direct Plot Main Form, finding the sp results from sp analysis, and then using the "add to outputs" for the YP section of the direct plot form when I hit Y11. Before ISR12 it will probably be a more verbose expression.

    The xval() part gives you the x-axis of the waveform - so assuming you did your sp analysis versus frequency, it will give you the frequency values for each y-parameter.

    Regards,

    Andrew.

Reply
  • Andrew Beckett

    Assuming you're using IC615 ISR12 or later, you can do this in the calculator using:

    imag(ypm('sp 1 1))/(2*pi*xval(ypm('sp 1 1)))

    I got the ypm part by using the Direct Plot Main Form, finding the sp results from sp analysis, and then using the "add to outputs" for the YP section of the direct plot form when I hit Y11. Before ISR12 it will probably be a more verbose expression.

    The xval() part gives you the x-axis of the waveform - so assuming you did your sp analysis versus frequency, it will give you the frequency values for each y-parameter.

    Regards,

    Andrew.

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