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   N-Ports in Designer       


N-Ports in Designer

N-ports are generic components for which characteristics may be defined in the form of user-supplied network-parameter data. They are called black box elements because no information regarding their function is provided except for their network parameters. The network parameters may be supplied as complex scattering parameters (S parameters), complex admittances (Y parameters), complex impedances (Z parameters), complex propagation constants (gamma parameters), or complex terminal characteristic impedances (Z0 parameters). The data may be given in either polar form or in rectangular form.

In System designs, relevant noise parameters may be provided for two-ports. When noise data is not supplied or is not applicable, a thermal noise contribution is extracted from the network parameters of passive networks or is set to zero for active networks. A passive network in this context is defined as a network that attenuates the incoming signal. Generally, the characterizing network parameters are frequency-dependent and would be supplied for several frequency points. A common application of this capability is to introduce measured data into the simulation for comparison or modeling, or to represent a part of a circuit for which modeling is difficult or undesired. User-supplied network-parameter data may be entered in spreadsheet form or called from external files. This data then may be extracted from the data files and used in the simulation. Several data file formats are supported:

• Touchstone/EESof Data — This format uses the .s*p, .y*p, or .z*p filename extension. Only one data set may be present in each .s*p, .y*p, or .z*p data file.

• Planar EM/HFSS V6.0+ (Ansoft Z0-Gamma) — This format uses the .szg file extension, and contains gamma and/or Z0 parameter data.

• Designer (Compact FLP) — This format uses the .flp filename extension, and may contain several data groups, each of which is preceded by a header. The data group header identifies the group by means of a label, which is used as a reference name.

• CITIfile — This format uses the .cit filename extension, and contains S-parameter data in a proprietary format.

• SSS file — This format uses the .sss filename extension, and contains data in a proprietary format.

 

The topics for this section include:

Creating an N-Port Model

Creating a Parametric N-Port Model

Placing an N-Port

Changing the Properties of an N-Port

Interpolation and Extrapolation of N-Port Data

S Parameter Definitions

 



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