s-parameters

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  1. V

    How is the S-element mapped in a SPICE .subckt?

    Hi everyone, I'm working with Cadence Sigrity for PDN analysis, and I'm trying to understand the underlying SPICE syntax it auto-generates when importing a series-extracted capacitor .s2p file. When I import my series model, Sigrity automatically generates the following subcircuit: *Series...
  2. Kafei42

    Measuring the Loaded Q of My 433 MHz Matching Network with Only a 50 Ω VNA

    Hi everyone, The transmitter output path is RFpin → Choke → DC-Block → Matching Network (PI/T) → 50 Ω antenna. Because the datasheet doesn’t pin down the pin impedance, I probed it directly: Zin (RFpin) ≈ 6.6 – j108.5 Ω (|X|/R ≈ 16.4). I now want to confirm the loaded Q / -3 dB bandwidth of the...
  3. K

    LTspice simulation of SAW Filter (*.s2p)

    I am trying to simulate the Infineon GPS SAW Filter B2618. I have converted the S-Parameters *.s2p file by s2spice.exe B2618_WB.s2p Z1 Z2 to *.lib file and imported it into LTspice with autogenerated symbol. When I run the AC simulation I got error: u1:r2p: Resistance must not be zero What I...
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