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Harmonic Balance (HB) Large-Signal S-Parameter (LSSP) simulation

Alex1354

Dear all,

Hi!

I'm trying to do a Harmonic Balance (HB) Large-Signal S-Parameter (LSSP) simulation to figure out the input impedance of a nonlinear circuit.

Through this simulation, what I want to know is the large-signal S11 only (not S12, S21 and S22).

So, I have simulated with only single port (PORT0) at input, but LSSP simulation is terminated and output log shows following text.

" Analysis `hb' was terminated prematurely due to an error "

The LSSP simulation does not proceed without second port.

Should I use floating second port (which is not necessary for my circuit) to succeed the LSSP simulation?

Does the LSSP simulation really need two ports?

Below figure is my HB LSSP simulation setup.

Additionally, Periodic S-Parameter (PSP) simulation using HB is succeeded with only single port.

What is the difference between PSP and LSSP simulations?

Parents

  • Hi Alex,

    I am afraid that it needs two ports... This is probably due to the way LSSP analysis is implemented. It launches waves from both sides because it needs to calculate S22 and S12 too. You can check Spectre User Guide for more info:

    Spectre Circuit Simulator and Accelerated Parallel Simulator RF Analysis in ADE Explorer User Guide 23.1

    PSP/HBSP and LSSP are used for different things... LSSP (Large-Signal S-Parameters) is true large-signal analysis. It includes nonlinear effects at different signal amplitudes (power levels). PSP/HBSP is a small-signal analysis linearized around the periodic operating point (of a large-signal) calculated by PSS/HB. It is independent of the input power. You also have SP which is also a small-signal analysis linearized around DC operating point. So, which one to use depends on what are you trying to do exactly?

    BR

    /Janko

Reply

  • Hi Alex,

    I am afraid that it needs two ports... This is probably due to the way LSSP analysis is implemented. It launches waves from both sides because it needs to calculate S22 and S12 too. You can check Spectre User Guide for more info:

    Spectre Circuit Simulator and Accelerated Parallel Simulator RF Analysis in ADE Explorer User Guide 23.1

    PSP/HBSP and LSSP are used for different things... LSSP (Large-Signal S-Parameters) is true large-signal analysis. It includes nonlinear effects at different signal amplitudes (power levels). PSP/HBSP is a small-signal analysis linearized around the periodic operating point (of a large-signal) calculated by PSS/HB. It is independent of the input power. You also have SP which is also a small-signal analysis linearized around DC operating point. So, which one to use depends on what are you trying to do exactly?

    BR

    /Janko

Children
  • in reply to JankoK

    Hi, JankoK.

    Thank you for your kind reply. It helped me a lot.

    As I read your comment, It became clear that what I want to do is the true large-signal analysis (LSSP).

    In order to do LSSP simulation, Can I use second port which is not connected to DUT?

    Actually, I've done it and the LSSP simulation result came out... but I'm not sure I can trust this result.

    Sincerely,

    Alex

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