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VNA Measurement Issue on VSS

KK202507285148

Hello, I was trying to get some measurements like OIP3, OP1dB and such as on VSS. I was using a ADL8142 and connected a VNA to it. I also specified the FSTART and FSTOP as 23/31 GHz and I have added the netlist to my AMP_F. But there is a problem.

1- When all the columns and values from the netlist are available (Freq(,MHz) Gain(,dB) NF(,dB) OP1dB(,dBm) OPSAT(,dBm) RISO(,dB) OIP3(,dBm) S11(mag,dB) S11(phs,deg) S22(mag,dB) S22(phs,deg) OIP2(,dBm)), the measurements for Gain, NF and etc. are wrong compared to the datasheet. Also, the netlist data are directly from their website so it shouldn't be a problem.

2- When I delete all the columns except Gain and NF (Freq(,MHz) Gain(,dB) NF(,dB)) and measure again, they become right.

3- When I add a single column of OP1dB (Freq(,MHz) Gain(,dB) NF(,dB) OP1dB(,dBm)), they become wrong again.


Is there an explanation for this which I am missing? I am new to AWR and especially VSS and it is important for my project. Thanks!

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  • CurtisAWR

    Is it possible for you to go to support.cadence.com and open a support ticket?

    This may be the best way for us to proceed, as the troubleshooting we are likely to do may require a more in-depth interchange, and possible exchange of project files or screenshots.

    I did go to Analog's site to try to download the data sheet you are working with, but I am already concerned that we may be looking at different documents and/or using the data sheet in a different way in the project.

  • KK202507285148
    in reply to CurtisAWR

    Hello, 

    Thanks for the reply. I assume support ticket is "create case" in the support page but it wants a premium so I was'nt be able to open a support ticket.

    I can further share the datasheet link as below,
    https://www.analog.com/en/products/adl8142-2.html

    I downloaded the s-parameters file here, there were 3 s2p files and a rfamp file in the excel format where it contains other attributes like OIP3, OP1dB and such as. I corrected their format and I assume my format is right because as I said it works when I delete the columns until NF and they are matched with the datasheet.

    I also want to further add some screenshots to provide better information but system gives an error so I can not upload. Maybe I can mail it to you or any other if you can inform me, I can do it.

    Best regards and thanks for your time.

Reply
  • KK202507285148
    in reply to CurtisAWR

    Hello, 

    Thanks for the reply. I assume support ticket is "create case" in the support page but it wants a premium so I was'nt be able to open a support ticket.

    I can further share the datasheet link as below,
    https://www.analog.com/en/products/adl8142-2.html

    I downloaded the s-parameters file here, there were 3 s2p files and a rfamp file in the excel format where it contains other attributes like OIP3, OP1dB and such as. I corrected their format and I assume my format is right because as I said it works when I delete the columns until NF and they are matched with the datasheet.

    I also want to further add some screenshots to provide better information but system gives an error so I can not upload. Maybe I can mail it to you or any other if you can inform me, I can do it.

    Best regards and thanks for your time.

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