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Different results between PSS and Transient Simulation when using NPORT (EMX)

youckgab

Hi, 

1) Why do I get different results in the PSS and Transient Analysis when using the NPORT of the EMX Simulation. For example, when I use the rational interpolation method for the NPORT I get different result for the PSS and Transient simulation. 

2) For the NPORT, which interpolation method do I need to use? for example when doing simulation for the VCO. What are the differences between each interpolation method?

3) Which simulation the PSS or Transient is more accurate when using NPORT?

  • Andrew Beckett

    First of all, asking this in the Feedback, Suggestions and Questions forum is not where you should be asking technical questions (that's for issues with the forum mechanism itself, not for technical questions). So I moved it into a more appropriate forum. You'll see in the Forum Guidelines that we normally also ask you to provide details of the software versions you're using to help with giving focused answers.

    I'd also suggest you read these articles on the support site:

    which give a good overview of the challenges and accuracy settings you need to successfully simulate s-parameters. For a start, you should be using the bbspice interpolation method and NOT rational. You should not use rational at all - in fact it's been removed in recent versions (it was there for legacy reasons, but has not truly been supported for over 15 years).

    I would not in general expect a difference in behaviour between PSS and Transient, but this may just be a consequence of the version you're using, or using the ancient rational method.

    Andrew.

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