Thursday, November 19, 2009

Modeling Temperature in LTSpice - Part I

We can model temperature behavior in LTSpice using the built in step function.

To model a list of temps, insert the spice directive ".step temp list "
example: .step temp list -25 -10 10 20 25 50 75

To model a sweep, insert the spice directive ".step temp "
example: .step temp -55 125 25

The following example models a simple transistor amplifier from -55C to 125C in 25C steps.

The transient analysis below shows the source current over temperature.

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