Adding Matching Elements to DUT in RF View Simulator

Circuit Topology for Input Matching

  Port 1 (50Ω) → [Shunt C₁] → [Series L₁] → [DUT S2P] → Port 2 (50Ω)
  
  This is a standard L-network input matching configuration.
  Shunt C₁: on the 50Ω input side (source impedance side)
  Series L₁: between shunt C₁ and the DUT input port

Step-by-Step in RF View Circuit Simulator

1. Open Circuit Simulator tab
2. Tap "Add Element" → select "S2P" → load DUT .s2p file → DUT block appears
3. Tap the "+" position BEFORE the DUT block
4. Select "Shunt C" → enter value: 6.8 pF → tap OK → shunt C inserted before DUT
5. Tap "+" between shunt C and DUT → "Series L" → 3.5 nH → OK
6. Verify circuit order: [Port1]→[Shunt C 6.8pF]→[Series L 3.5nH]→[DUT S2P]→[Port2]
7. Tap "Simulate" → RF View computes cascaded S-parameters
8. View S11: should show deep dip at matching frequency

Comparing With Auto Match Result

  Auto Match suggests: C=6.8pF, L=3.5nH (same values as manual)
  Circuit Simulator with these values: S11=−18.4 dB at 900 MHz ✓
  
  Try detuning: change L to 3.3 nH → S11=−14.2 dB (acceptable but less optimum)
  Try changing C to 6.2 pF → S11 shifts to 920 MHz (frequency detuning visible)

Adding Output Matching

  For two-port matching (input and output simultaneously):
  [Port1]→[Input C₁]→[Input L₁]→[DUT]→[Output L₂]→[Output C₂]→[Port2]
  
  Simulate: S11 (input match) and S22 (output match) both visible
  Combined circuit provides simultaneous 50Ω match at both ports

Related Topics

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