De-embed S parameters for 3 Fixtures/ Pads

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Hello everyone,
I am a student and have the following problem:
I would like to use the function “deembedsparams” to de-embed my DUT. Unfortunately, i am not using two fixtures or pads as intended for this function, but three. I would therefore have to de-embed all three. Can someone tell me to what extent I can use the function for my problem and what I have to consider. maybe there is a workaround solution like de-embedding each pad iteratively?
I hope someone can help me with my problem.
Many thanks in advance
Patrick

Accepted Answer

Pratyush
Pratyush on 18 Jun 2024
Hi Patrick,
To de-embed three fixtures or pads from your Device Under Test (DUT) using MATLAB's 'deembedsparams' function, which is originally designed for two-port networks, you can follow an iterative, step-by-step approach. Here’s a possible strategy:
  • Obtain the S-parameters for each of the three fixtures or pads individually.
  • De-embed the first fixture/pad from the DUT combined with all fixtures/pads.
  • De-embed the second fixture/pad from the result of the first step.
  • Finally, de-embed the third fixture/pad.
  • The sequence of de-embedding might affect accuracy; choose it based on the physical and electrical configuration.
  • Ensure high accuracy in the S-parameters of each fixture/pad.
  • Validate your final de-embedded S-parameters against direct measurements or simulations if possible.
This approach relies on the assumption that the effects of the fixtures/pads can be independently and sequentially de-embedded, which may not hold in more complex RF systems. Accuracy and validation are crucial throughout this process.

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