eldo_user

Working with S, Y, Z Parameters
Instantiating a Block Defined by S, Y, Z Parameters
• PIN: IP1 IN1 ... IPN INN
Required. The 2×N pins of the N-port model will be connected to nodes IP1 IN1 ... IPN
INN. Any number of ports can be specified.
Description
Any model may be instantiated as many times as required with the same or different input data
file.
Any FBLOCK instance will contribute to the global noise results of .NOISE and .SSTNOISE. If
the Touchstone format file contains noise parameters then they will be used to compute the
noise contribution, otherwise the simulator will use the Twiss formula.
Twiss Formula
Where:
C y = Noise Correlation Matrix
k = Boltzmann Constant
t = Temperature
Y = Y Parameter Matrix
H = Hermitian Matrix (complex conjugate transpose)
The FBLOCK file parameter is searched with the same methodology as searching library files,
see “Search Path Priorities” on page 133. This means that if the FBLOCK file is not found in the
current directory, the library where the corresponding FBLOCK instance was found is searched
first if FBLOCK was actually read from a library. If not found, the directories are searched in
the order specified by the option SEARCH.
Examples
In this example, a block ytline is defined. By default, the CPF method runs. Delay extraction is
allowed (if feasible), fit is set to individual, the model is assumed symmetric, passivity
enforcement is set for pre-fit stage; refit, extrapolation to DC, and high precision flags are
disabled, and the parameters MAXCOL, MAXROW are set to their default values, 1500 and
40,000 respectively. The file name is given in conventional form, by using the keyword
“string:”.
Eldo® User's Manual, 15.3 703