eldo_user

Running Parametric Analyses
Temperature Handling
containing the TEMPER variable will be automatically reevaluated in the case of a
change in this temperature.
Note
The TEMP variable is synonymous with the TEMPER variable. Both refer to the
temperature of the circuit.
If TNOM is not specified on a model, the global TNOM is used. If TEMP is not specified on a
model, the global .TEMP is used (or global TNOM if global .TEMP not specified).
To dynamically change temperature you can define a temperature source as a voltage source
and specify option VARTEMP to vary simulation temperature by following the source
variation. See option “VARTEMP” in the Eldo Reference Manual.
Temperature can be dynamic as well as static, and can be specified through a PWL source.
Examples
Differences between TNOM and TEMP
The difference between TNOM (model reference temperature) and TEMP (simulation
temperature) is shown in the examples below:
The following example assumes that devices using model foo1 will use model parameters
updated for a temperature of 30°C. Knowing that the parameters specified in the .MODEL
statement are given for a temperature of 25°C (through the TNOM option) the model
parameters will be updated accordingly. Devices using model foo2 will use model parameters
for the nominal temperature of 25°C. The rest of the circuit will be simulated at 10°C.
.model foo1 temp=30 vto=1
.model foo2 vto=1
.option tnom=25
.temp 10
The following example assumes that devices using model foo will use model parameters
updated for a temperature of 30°C. Knowing that the parameters specified in the .MODEL
statement are given for a temperature of 25°C (through the TNOM option) the model
parameters will be updated accordingly. The rest of the circuit will be simulated at 25°C
through the TNOM option.
.model foo temp=30 vto=1
.option tnom=25
In the following example, a nominal temperature of 20°C is used for model foo1, a nominal
temperature of 25°C is used for model foo2, and a nominal temperature of 30°C is used for
foo3.
Eldo® User's Manual, 15.3 289