How to Use a .s2p File as a DUT in RF View Simulator

What Is a DUT Block?

A DUT (Device Under Test) block in RF View's circuit simulator loads a measured or simulated .s2p Touchstone file and treats it as a two-port element in the simulation chain. This is powerful because you use real measured data (not ideal component models) for the core device, combined with ideal or real matching elements.

Step-by-Step: Load .s2p as DUT

1. Open RF View → Circuit Simulator tab
2. Tap "Add Element" → scroll down → select "S2P" or "DUT" from element list
3. A file picker opens → navigate to your .s2p file → tap to select
4. The S2P block appears in the circuit chain with the filename shown
5. The block's frequency range is automatically set to match the .s2p file's data

Build a Complete Matching Circuit

  Example: PA + output matching network

  Circuit chain (left to right = Port 1 to Port 2):
  [Port 1: 50Ω] → [Shunt C: 4.7 pF] → [Series L: 2.2 nH] → [S2P: PA.s2p] → [Port 2: 50Ω]

  1. Tap + before S2P block → Add Shunt C (4.7 pF)
  2. Tap + (between shunt C and S2P) → Add Series L (2.2 nH)
  3. S2P block already loaded = the PA device
  4. Tap "Simulate" → RF View computes S11 and S21 of the complete circuit
  5. S11: shows matched input reflection (should be <−10 dB)
  6. S21: shows gain through matching + PA

Multiple S2P Blocks in Series

You can cascade multiple S2P blocks to simulate a receive chain:

  [50Ω] → [S2P: LNA.s2p] → [Series L: 1nH] → [S2P: Filter.s2p] → [50Ω]

  Simulates the combined response of LNA + matching trace + filter.
  S11 = system input match, S21 = total gain+loss through chain.
  No manual ABCD multiplication needed — RF View does it automatically.

Modifying DUT S2P File

To swap between different device options:

1. Tap the S2P block → shows current filename
2. Tap "Change File" → select new .s2p → circuit updates automatically
3. Compare PA_version1.s2p vs PA_version2.s2p with the same matching network

Related Topics

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