State Space N-Port Data Options Tab

The Options tab is used to select the behavior of the selected NPort.

The following controls are available:

• Nexxim/HSPICE — Sets the NPort type. The selections for Interpolation, Extrapolation, DC Behavior, Method, and Passivity Enforcement depend on the NPort type selected.
• Interpolation — Specifies the interpolation method for data points in the frequency range of the Touchstone data.
• Extrapolation – Specifies the extrapolation method for data points outside the frequency range of the Touchstone data.
• DC Behavior — Specifies behavior of the N-Port at DC (zero frequency).
• Method – Specifies the method used to convert frequency domain data to the time domain. Choice of methods is available only for Nexxim Nports.
• Passivity Enforcement — Performs a passivity check on the S-parameter data and attempts to correct non-passive data. The options are None, IFPV, IFPVLF, Convex Optimization, and Passivity by Perturbation.

  Passive devices may dissipate or temporarily store energy, but never generate energy. Use the drop-down menu to select the method for enforcing passivity. Passivity enforcement is available only for Nexxim NPorts. See Passivity Checking and Enforcement. For details on passivity checking and enforcement, see S-Parameter Technical Notes.

  When applying IFPVLF, the passive DC fit to Scattering Parameter Data (S-data) can deteriorate to the point the inaccuracies of the (passive) fit to the corresponding Impedance Data (Z-data) at zero frequency (DC) and low-frequency may cause inaccurate time-domain steady state simulations. If preserving an accurate passive DC fit to S-data is important, like it is in power electronics applications, e.g., with DC-DC converters and power supply Voltage Regulator Module (VRM)), then click the Advanced Passivity Correction for DC beta option to enhance the passive DC fit to S-data using IFPVLF. The Advanced Passivity Correction for DC is located in the Beta Options in the Global Options.

  

• Use reciprocal – Computes the inverse, or reciprocal, at each frequency so the N-port can be used for de-embedding. See Deembedding S-Matrices.
• Noise Model – Specifies noise model for DC and frequency-domain analyses:
  • None – No noise analysis
  • Internal – Use internal noise model
  • External – Use noise data from Touchstone file if present, else use internal noise model
• Additional Options — Allows you to add model-level options for Nexxim or HSPICE.

When the N-port Options have been entered, click OK or select another tab.

• Network Data Explorer – Allows you to view solution data by opening the Network Data Explorer.

When the N-port Options have been entered, click OK or select another tab.