User Guide

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16 Primer: How to Optimize a Desi
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n
progress indicator has a tick mark 1/4 of the way up.
The vertical bar within the indicator is below the tick
mark; this means that the constraint is currently
satisfied.
5
From the Tune menu, select Auto and click Start to start
optimization.
After a number of iterations, the optimization ends without
satisfying the goal.
Fi
g
ure 2-7
Results after Adding the Power Constraint
Note that the power dissipated in R1 is exactly equal to the
target value of the constraint (4 mW). In this example there
is no feasible solution to the problem. However, the PSpice
Optimizer found the lowest value for Id1 which does not
violate the constraint.
Chan
g
in
g
the Constraint and
Rerunnin
g
the PSpice Optimizer
You can examine the effect the Pc constraint has on
performance by changing its constraint type so the power
dissipation in the resistor must be greater than or equal to
4mW.