eldo_user

Running Parametric Analyses
Temperature Handling
.model foo1 tnom=20 vto=1
.model foo2 vto=1
.model foo3 tmod=30 vto=1
.option tnom=25
DTEMP and TEMPER examples
In this example, the DTEMP parameter sets the temperature of the capacitor 10°C above the
circuit temperature.
c1 1 2 cmodel1 tc1=25e-3 m=2 dtemp=10
.model cmodel1 c cox=1e-12 capsw=1e-12 del=0.01 l=1 w=1
.TEMP 70
The TEMPER variable may be used in conjunction with VALUE={EXPR} in resistors,
capacitors and inductors to specify devices whose values vary with temperature.
The following example specifies a capacitor Cvariable connected between nodes 3 and 7 and its
value defined as the nominal capacitance C0 multiplied by (1+ 0.002 multiplied by the square of
the current simulation temperature TEMPER). The TEMPER variable may also be used in
expressions for model parameters.
Cvariable 3 7 VALUE={C0*(1+0.002*(TEMPER^2))}
The following example shows how the DTEMP parameter is used to specify a difference
between the circuit temperature and the subcircuit instance temperature. In this example Eldo
will assume that the temperature of devices inside X1 will be 40 + 10 = 50 °C:
.subckt r 1 2
r1 1 2 1 tc1=1
.ends
i1 1 0 1
x1 1 0 r dtemp = 10
.TEMP 40
.op
.end
See Also
• Resistor, Capacitor, and Inductor in the Eldo Reference Manual
• Diode Models, BJT Models, MOSFET Models in the Eldo Reference Manual
• Subcircuit Instance in the Eldo Reference Manual
Related Topics
Assigning Parameter Values
Electrothermal Simulation
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Eldo® User's Manual, 15.3