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Nexxim Simulator > N-Element, Frequency-Dependent S-Parameters
N-Element Instance Netlist FormatThe N element is characterized by a set of frequency-dependent scattering (S) parameters, compatible with the N-element from Ansoft Maxwell SpicelinkÔ. The N-element has the netlist format: Nxxx n1+ n1-... nN+ nN- file_reference Each of the N ports is a pair of terminals, positive and negative: n1+ n1- through nN+ nN-. N-Element Instance Netlist ExampleNmain 20 0 21 0 22 0 23 0 freq_data.txt Notes1. The file_reference refers to an external file (usually with a .fws extension) containing the S-parameter data. See File References in the Nexxim Netlist File Format topic for details. 2. The format of the S-parameter data file is: # freqi smag11 sphase 11 smag12 sphase12 ... 3. The Npoints parameter specifies the number of frequency points (including zero frequency) that follow. The Zref parameter specifies the constant, frequency-independent reference impedance that was used for all of the ports, typically 50 Ohms. 4. The frequencies freq1, freq2, ... should be on a regular grid from Freq_min to Freq_max with steps of size (Freq_max - Freq_min)/(Npoints - 1). Freq_min is always zero when the data comes from Maxwell Spicelink. 5. The magnitude is absolute magnitude (not dB) and the phase is in degrees. The S-parameter matrix is specified as a full matrix.
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