SIMPLORER User Manual V6.0 - FER-a

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114 Modeling with Circuit Components
Equivalent Line (BJTEQUL):
The BJT characteristic is defined by an Equivalent line.
You have to enter a value for the Forward voltage, Bulk
resistance and Reverse resistance.
Vlimit stands for the intersection of the forward and reverse
characteristic and is calculated by the program itself.
Exponential Function (BJTEXP):
The BJT characteristic is defined by an Exponential
function. You have to enter values for the Saturation
current, Thermal voltage and Reverse resistance.
XY Data Pairs (BJTXY)
The BJT characteristic is defined by a data table. You can define the table within the characteristic
dialog directly or load an existing file. The data pairs are displayed in the lookup table
and used for the characteristic. You can modify the data when necessary. See also “Separate
Component Characteristic” on page 297.
� «Element Name»
The characteristic of the BJT is defined by a characteristic component. Characteristic parameter
type. Enter the name in the text box (e.g. XY1.VAL, EXP.VAL) or use the pin to connect
the characteristic component. The internal used type is BJT.
� � «Use pin»
If the box is checked, the name is defined by the quantity connected to the pin, otherwise the
name in the text box is used.
«Control Signal»
Defines the BJT control signal. Control parameter type. Enter a numerical value, a variable,
or an expression in the text box or use the pin to connect a quantity.
� � «Use pin»
If the box is checked, the name is defined by the quantity connected to the pin, otherwise the
name in the text box is used.
Component Parameters
I =
vt () – Vf --------------------- for v() t ≥ V
R limit
b
I =
vt ()
--------- for v() t < Vlimit Description [Unit] Parameter Name Data Type
Characteristic; BJT CH real
Control Signal; All components CTRL real
Forward Voltage [V]; BJTEQUL VF real
Bulk Resistance [Ω]; BJTEQUL RB real
Reverse Resistance [Ω]; BJTEQUL/BJTEXP RR real
Saturation Current [A]; BJTEXP ISAT real
Thermal Voltage [V]; BJTEXP VT real
Characteristic; BJTXY FILE file
R r
vt ()
---------
⎛ Vt ⎞
it () = Is ⋅ ⎜e– 1⎟
for v() t ≥ 0
⎝ ⎠
it ()
vt ()
=
--------- for v() t < 0
R r