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SP-Simulation : GPC Option

bVenu

I have a question about how to interpret the power gain circles plotted using Spectre's SP analysis

For plotting the power gain circles on the Z-smith chart , there are 2 options: Frequency and Gain Level

 Suppose I select sweep  "Gain level"  Start = 5dB , Stop = 20dB , step = 5

In my circuit, input port = 50-ohms , output port = 500-ohms.

  Will this sweep the value of the output port impedance and create circle with all the points where the power gain is the same?Are the values that we read off the smith chart are output reflection coefficients? Are they normalised to the input port or output port resistance?

 Is there any technote/tutorial that explains how to use the different 'Main-Form" options in the SP analysis?

Thanks
Venu

Parents

  •  Hi Venu,

     

    Please check out the appendix D of the SpectreRF User guide.  The appendix is called: Plotting Spectre S-parameter Simulation Data

     http://support.cadence.com/wps/mypoc/cos?uri=deeplinkmin:DocumentViewer;src=pubs;q=/spectreRFvol2/spectreRFvol27.1.1/appD.html

     

    You may also want to check out the example:  LNA Design Using SpectreRF AppNote

    http://support.cadence.com/wps/mypoc/cos?uri=deeplinkmin:DocumentViewer;src=wp;q=ApplicationNotes/Custom_IC_Design/LNA_62_appnote.pdf

     

    Best regards,

    Tawna

     

     

     

     

Reply

  •  Hi Venu,

     

    Please check out the appendix D of the SpectreRF User guide.  The appendix is called: Plotting Spectre S-parameter Simulation Data

     http://support.cadence.com/wps/mypoc/cos?uri=deeplinkmin:DocumentViewer;src=pubs;q=/spectreRFvol2/spectreRFvol27.1.1/appD.html

     

    You may also want to check out the example:  LNA Design Using SpectreRF AppNote

    http://support.cadence.com/wps/mypoc/cos?uri=deeplinkmin:DocumentViewer;src=wp;q=ApplicationNotes/Custom_IC_Design/LNA_62_appnote.pdf

     

    Best regards,

    Tawna

     

     

     

     

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