User Guide

Measurin

and Optimizin

Performance 3

-19

To optimize

our desi

From the Tune menu, select Update Performance.

The PSpice Optimizer measures the design’s performance

using both the initial and current values for each of the

parameters. The optimizer updates the initial and current

fields, respectively, for each specification, and sets the

progress indicators showing how closely these initial

measures match each of the target values.

From the Tune menu, select Auto and click Start.

The PSpice Optimizer computes the derivatives for each

specification with respect to each parameter, and uses this

information to determine the direction in which to vary the

parameters. With each iteration, the optimizer tries

parameter changes along the chosen direction and measures

performance until it achieves a reduction in the overall

error. The optimizer then updates the parameters, calculates

new derivatives, and repeats the process until one of the

following occurs:

• Specifications are met (success).

• No more progress can be made (failure).

• You manually interrupt the process.

To abort the optimization run

From the Tune menu, select Auto and click Terminate.

Graphicall

Monitorin

Pro

ress

To see how well specifications are approaching the optimization

requirements, use Probe to monitor the simulation results from

each of the iterations.

To monitor optimization pro

ress

In Schematics, from the Analysis menu, select Simulate to

simulate the circuit.

Tune menu

See Viewing the Optimization

Log on page 3-28 for information

on the audit trail the PSpice

Optimizer

enerates when

runnin

an optimization.