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Verifying PSTB results by using PAC results.

RFStuff

Dear All,

We have successfully verified the STB analysis results by using AC analysis results.   

We have injected voltage and the current sources as given in the document https://kenkundert.com/docs/cd2001-01.pdf.

And for each we have found the AC gains. We then used the equations given in pages 35-36 of the above document. 

However, for PSTB:-  how to use the PAC results to verify the PSTB result is the QUESTION. We are NOT sure which PAC-sideband Spectre is taking ?

Could anybody please tell me how to verify the PSTB results with PAC results.

I have filed a SR Case# 46338720 regarding this. But, it is still hanging over months.

I guess, the AEs may NOT be able to understand the questions or they do NOT find the right person in R&D to clear the doubts.

Kind Regards,

Parents

  • Hi RFStuff,

    You can request to have your Case escalated if the answer isn't getting answered in a timely manner.   In this situation, the AE is following up with R&D.   I'll step in and "help" this along for you.  

    best regards,

    Tawna

  • in reply to Tawna

    Hi Tawna,

    Thanks a lot for your reply.

    As you said, should I request the AE to escalate mentioning your name in the mail.

    Please guide in this regard.

    Kind Regards,

  • in reply to RFStuff

    Hi RFStuff,

    The AE is already working with R&D on this, so escalating will not help.   Sorry for the late reply...I just saw your email - it was buried in my infinite email stack!

  • in reply to Tawna

    Hi Tawna,

    The AE has finally said as :- R&D are not supposed to reveal how PSTB works.

    I wonder, when for STB there is a well published paper/document (https://kenkundert.com/docs/cd2001-01.pdf.) to explain the details of how STB works, but for PSTB  they are saying for not to reveal. 

    Like STB, if we know how PSTB claculation is done from PAC analysis, we can verify the result with our mathematical analysis and ensure that the PSTB simulation result what we are getting is indeed correct.

    So, could you please help us in this regard.

     Kind Regards,

  • in reply to RFStuff

    Have you tried to use the setup from the paper (with pac sources and pac analysis instead of ac) and to take the results from sideband 0 as mentioned in my reply above from 3 months ago? With the equations from the paper, you should then get the same results as with a pstb analysis.

  • in reply to Frank Wiedmann

    Frank. I have tried 3 months back with PAC and SB=0. But it was NOT matching unlike its STB counterpart.  Looks like I am missing something.

  • in reply to RFStuff

    You could verify your setup by starting with the setup for stb verification. Just add a periodic source that is not connected to the rest of the circuit, so that the pss analysis will have no problems. You should get the same results with pstb for this setup as for stb before. When you convert the ac sources to pac sources, you should also get the same results in the pac analysis as in the ac analysis before. Of course, you must use the absolute (not relative) sweep in the pac analysis.

Reply
  • in reply to RFStuff

    You could verify your setup by starting with the setup for stb verification. Just add a periodic source that is not connected to the rest of the circuit, so that the pss analysis will have no problems. You should get the same results with pstb for this setup as for stb before. When you convert the ac sources to pac sources, you should also get the same results in the pac analysis as in the ac analysis before. Of course, you must use the absolute (not relative) sweep in the pac analysis.

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