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Nexxim Simulator > S Frequency Dependent Data ModelThe S model provides frequency-dependent data in the TouchstoneÒ format. Touchstone is a registered trademark of Agilent Technologies. Refer to the Touchstone File Format Specification for information on this format. The S model has the following netlist syntax. .MODEL modelname S TSTONEFILE=”[pathname]filename” [INTERPOLATION=LINEAR|STEP] [INTDATTYP=MA|RI|DBA] [HIGHPASS=val] [LOWPASS=val] [CONVOLUTION=0|1|2] [RELTOL=val] [MOR=val] [MAX_STATES=val] [CACHE_STATE_SPACE=val] [BY_ENTRY=val] [G_TO_GND=val] [Q_LIMIT=val] [DELAYHANDLE=0|1] The file_reference specifies the directory and filename for the Touchstone file.
A W-element can be described by S-parameter data from a Touchstone file. Additional S-model parameters for W-elements are listed below. When Nexxim encounters one of these parameters in an S-Model definition, it looks in the circuit for the corresponding W-element. If the W-element is found, the S-model calculates the W model. If no W-element is found, these parameters are ignored. XLINELENGTH=val [ER=val] [MAX_ER=val] The XLINELENGTH parameter on the S-Model specifies a unit length (default 1 meter). Nexxim computes the equivalent RLGC or TABLE model for that unit length from the S-parameter data. The parameter L on the W-Element specifies the actual length of transmission line to simulate using the calculated model. The parameter ER is the dielectric constant of the substrate for the W-element. If ER is not known, or if there are multiple substrates, use MAX_ER to provide an estimate that is greater than the probable maximum value. If both ER and MAX_ER are given, the larger of the two values is used. If neither parameter is supplied, a dielectric constant of 15 is used. An accurate RLGC or TABLE model will always be produced as long as no actual dielectric constant is larger than the one used in the calculation.
S Model Netlist ExamplesHere is an example of an S model netlist statement: .MODEL S_2port S TSTONEFILE=”C:/fdata/tsdata.s2p” Here is an example of a two-port S-parameter file with three frequency points, in real-imaginary format, adapted from the Touchstone File Format Specification: !2-port S-parameter file, three frequency points # GHZ S RI R 50.0 !freq ReS11 ImS11 ReS21 ImS21 ReS12 ImS12 ReS22 ImS22 1.000 0.393 -0.121 -0.001 -0.002 -0.001 -0.002 0.393 -0.121 2.000 0.352 -0.305 -0.010 -0.030 -0.010 -0.030 0.352 -0.305 10.000 0.342 -0.334 -0.013 -0.038 -0.013 -0.038 0.342 -0.334 Here is an example of a four-port S-parameter file with three frequency points, in magnitude-angle format, adapted from the Touchstone File Format Specification: ! 4-port S-parameter data, three frequency points # GHZ S MA R 50 !freq MS11 AS11 MS12 AS12 MS13 AS13
MS14 AS14 5.000 0.60 161.24 0.40 -42.20 0.42 -66.58
0.53 -79.34 6.000 0.57 150.37 0.40 -44.34 0.41 -81.24
0.57 -95.77 7.000 0.50 136.69 0.45 -46.41 0.37 -99.09
0.62 -114.19
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