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Nexxim Simulator > SP Frequency Dependent Data ModelThe SP model provides frequency-dependent data in matrix form for S-element or W-element models. The SP model is implemented as the standard frequency response model described below. Frequency Response ModelThe SP frequency response model has the following netlist format. .MODEL modelname SP [SPACING=LINEAR|NONUNIFORM] [N=matrix_dimension] [VALTYPE=CARTESIAN|POLAR|DECIBEL|REAL] [MATRIX=SYMMETRIC|HERMITIAN|NONSYMMETRIC] FSTART=freq0 FSTOP=freqN DATA=[num_freqs matrix_data] | DATAFILE=file_reference Spacing between frequency points is linear or uniform, with a frequency increment of All frequencies are specified in hertz. The frequency response model specifies the frequency-dependent response of the element with a sequence of matrices, one for each frequency. Parameter N is the number of signals or ports, which determines the full dimension of each matrix, N ´ N. The default is N=1. DATA Entry The frequency-dependent data can be provided in a DATA entry that is part of the .MODEL statement, or in a separate file identified in a DATAFILE reference in the .MODEL statement. The use of a separate data file is discussed in the later section Data Files. The structure of the DATA entry depends on the number of frequencies given by the num_freqs entry, the type of the data matrices as specified by the MATRIX parameter, and on the type of the data, real or complex. In the definitions that follow, we shall use the following algebraic conventions: hij(sk) = the response at port i
due to the input at port j, at the kth frequency s, MATRIX=SYMMETRIC is the default. In a symmetric
matrix, hij = hji for all i,j. The DATA
points specify only the lower-triangular portion of each matrix, i.e.,
the portion of the matrix for which The structure of the DATA entry for a linear symmetric matrix of real data is: DATA=[ q + h11(s1) + ... + hN1(s1) ... hNN(s1) ... + h11(sq) + ... + hN1(sq) ... hNN(sq) + ] For example, for a two-port system with symmetric linear real response over two frequencies, the .MODEL statement would have the structure: .MODEL twop1 SP SPACING=LINEAR N=2 MATRIX=SYMMETRIC FSTART=1.0e+3 FSTOP=2.0e+3 DATA=[ 2 + h11(s1) + h21(s1) h22(s1) + h11(s2) + h21(s2) h22(s2) + ] The structure of the DATA entry for a linear symmetric matrix of complex data is: DATA=[ q + h11re(s1) h11im(s1) + ... + hN1re(s1) hN1im(s1) ... hNNre(s1) hNNre(s1) ... + h11re(sq) h11im(sq) + ... + hN1re(sq) hN1im(sq) ... hNNre(sq) hNNre(sq) + ] For example, for a two-port system with symmetric linear complex response over two frequencies, the .MODEL statement would have the structure: .MODEL twop2 SP SPACING=LINEAR N=2 MATRIX=SYMMETRIC FSTART=1.0e+3 FSTOP=2.0e+3 DATA=[ 2 + h11re(s1) h11im(s1) + h21re(s1) h21im(s1) h22re(s1) h22re(s1) + h11re(s2) h11im(s2) + h21re(s2) h21im(s2) h22re(s2) h22re(s2) + ] MATRIX=HERMITIAN. In a hermitian matrix, the
data is complex and hij = hji* for all i,j,
where * denotes the complex conjugate. As with symmetric matrices, the
DATA points for a hermitian matrix specify only the lower-triangular
portion of each matrix, i.e., the portion of the matrix for which MATRIX=NONSYMMETRIC. For nonsymmetric matrices, the DATA must specify the full matrix of real or complex data. The structure of the DATA entry for a nonsymmetric matrix of real linear data is: DATA=[ q + h11(s1) ... h1N(s1) + ... + hN1(s1) ... hNN(s1) ... + h11(sq) ... h1N(sq) + ... + hN1(sq) ... hNN(sq) + ] For example, for a two-port system with nonsymmetric linear real response over two frequencies, the .MODEL statement would have the structure: .MODEL twop3 SP SPACING=LINEAR N=2 MATRIX=NONSYMMETRIC FSTART=1.0e+3 FSTOP=2.0e+3 DATA=[ 2 + h11(s1) h12(s1) + h21(s1) h22(s1) + h11(s2) h12(s2) + h21(s2) h22(s2) + ] The structure of the DATA entry for a nonsymmetric matrix of complex linear data is: DATA=[ q + h11re(s1) h11im(s1) ... h1Nre(s1) h1Nim(s1) + ... + hN1re(s1) hN1im(s1) ... hNNre(s1) hNNre(s1) ... + h11re(sq) h11im(sq) ... h1Nre(sq) h1Nim(sq) + ... + hN1re(sq) hN1im(sq) ... hNNre(sq) hNNre(sq) + ] For example, for a two-port system with nonsymmetric linear complex response over two frequencies, the .MODEL statement would have the structure: .MODEL twop4 SP SPACING=LINEAR N=2 MATRIX=NONSYMMETRIC FSTART=1.0e+3 FSTOP=2.0e+3 DATA=[ 2 + h11re(s1) h11im(s1) h12re(s1) h12im(s1) + h21re(s1) h21im(s1) h22re(s1) h22re(s1) + h11re(s2) h11im(s2) h12re(s2) h12im(s2) + h21re(s2) h21im(s2) h22re(s2) h22re(s2) + ] The structure of the DATA entry for a NONUNIFORM frequency distribution is: DATA=[ q + f1 h11(s1) ... h1N(s1) + ... + hN1(s1) ... hNN(s1) ... + fq h11(sq) ... h1N(sq) + ... + hN1(sq) ... hNN(sq) + ] For example, for a two-port system with nonuniform linear real response over two frequencies, the .MODEL statement would have the structure: .MODEL twop3 SP SPACING=NONUNIFORM N=2 MATRIX=NONSYMMETRIC DATA=[ 2 + 1.0e+3 h11(s1) h12(s1) h21(s1) h22(s1) + 2.0e+3 h11(s2) h12(s2) h21(s2) h22(s2) + ] Data FilesThe frequency response model can reference a separate file containing the response data, instead of using data supplied in-line in the .MODEL statement. Instead of the DATA entry, the netlist syntax contains an entry of the form: DATAFILE=file_reference The file_reference identifies an external file containing the data. See File References for details. The data file must contain only the numeric data, with entries separated by spaces, commas, tabs, or end-of-lines. No comments are allowed. An example of a model statement using a data file reference is: .MODEL fmod SP N=2 SPACING=LINEAR FSTART=0 FSTOP=40 + MATRIX=NONSYMMETRIC + DATAFILE="c:\circuits\s_element.dat" The corresponding data file, for a two-input S-parameter device over two frequency points (0.0 Hz and 40 Hz), in complex Cartesian form, would have data such as the following: 2, 0,0,1,0,1,0,0,0 0,0,2,0,2,0,0,0 This encodes the following data points: f=0: h11=0.0+j0.0, h12=1.0+j0.0, h21=1.0+j0.0, h22=0.0+j0.0 f=40: h11=0.0+j0.0, h12=2.0+j0.0, h21=2.0+j0.0, h22=0.0+j0.0 Imported Data from Touchstone FilesIn a schematic, an N-port element or other element that uses the S-model or W-model can directly import S-parameter data from a Touchstone file. Designer creates an SP model with the data. The Touchstone file can contain noise data. To import the data in the correct format, select the Noise Data tab on the N-Port Data dialog and make sure the Option field has the default setting: Fmin Mag(Gopt) Ang(gopt) Rn Here is an example Touchstone file: !2-port S-parameter file with noise data # 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 !Noise Parameters (Nfreq Fmin MGopt PGopt Rnoise) 4 0.7 0.64 69 0.38 8 2.7 0.46 -33 0.40 Here is the .MODEL statement that Designer creates for this file (some trailing zeros have been deleted for brevity): .model NportData SP N=2 SPACING=NONUNIFORM MATRIX=NONSYMMETRIC + INTERPOLATION=LINEAR INTDATTYP=RI HIGHPASS=10 LOWPASS=10 DATA=( +3 + 1.00E+009 3.93E-001 -1.21E-001 -1.00E-003 -2.00E-003 + -1.00E-003 -2.00E-003 3.93E-001 -1.21E-001 + + 2.00E+009 3.52E-001 -3.05E-001 -1.00E-002 -3.00E-002 + -1.00E-002 -3.00E-002 3.52E-001 -3.05E-001 + + 1.00E+010 3.42E-001 -3.34E-001 -1.30E-002 -3.80E-002 + -1.30E-002 -3.80E-002 3.42E-001 -3.34E-001 + +) + NOISE_FREQUENCY = ( + 4.000000E+009 ,8.000000E+009 ) + NOISE_FIGURE = ( + 7.000000E-001 ,2.700000E+000 ) + GAMMA_MAG = ( + 6.400000E-001 ,4.600000E-001 ) + GAMMA_ANG = ( + 6.900000E+001 ,-3.300000E+001 ) + NOISE_RESISTANCE = ( + 3.800000E-001 ,4.000000E-001 )
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Ansoft Designer / Ansys Designer 在线帮助文档：
and 
, where i is the row number and j is the
column number.
, where i is
the row number and j is the column number. The DATA structure
is the same as the one given above for the symmetric matrix of complex
data.
