SIMPLORER User Manual V6.0 - FER-a

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5
164 Modeling with Circuit Components
Dialog Settings
� «Value»
Click the «Value» field of the corresponding parameter to define a value. Common parameter
types. Enter a numerical value, a variable, or an expression. The parameters can be set only
at the beginning of a simulation.
Look the parameter meaning up in the info lines of the parameter table (online help).
«Name»«Default»«Unit»«Description»
Displays the parameter names and their corresponding unit, default value, and description.
You cannot make changes in these fields. If you want to add user-specific information to a
parameter, use the «Info» field in the component output dialog.
4.6.5 Line Models
The line components are implemented as C models. The models use the MaxwellSpice.dll file.
The simulation parameter HMIN (minimum time step) should be 0.1ns for the first simulation
run. Then you can adjust the value for optimal simulation performance. For simulations of
power electronics circuits, HMIN can be up to 100ns. Large values of HMIN can be used for long
lines.
Lossy Transmission Line
>>Basics>Circuit>Spice-Compatible Models>Line Models
The Spice-compatible lossy transmission line model simulates the electrical behavior of a
lossy transmission line using SPICE3 LTRA parameters and equations. Line electrical characteristics
are calculated according to user-defined line parameters.
The example shows all four supported modes of the LTRA model. The line is 0.2m long, and
it has a characteristic impedance given by sqrt (L/C) = 50 Ω. The wave velocity is given by 1/
sqrt (LC)=2e8 m/s, and the line's travel time is 1ns. With a series resistance of 100 Ω/m, the
total series resistance is 20 Ω, or 40% of the characteristic impedance, so the line is very lossy.
Pulse
RG curve
LTRA model in RLC, RG, LC, and RG mode
RCL curve
LC curve
RC curve