User Guide

iv Contents

Changing the Constraint and Rerunning the PSpice Optimizer . . . . . . 2-16

Using Standard Component Values . . . . . . . . . . . . . . . . . . . . 2-18

Producing Reports . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-18

Saving Results . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-19

Updating the Schematic . . . . . . . . . . . . . . . . . . . . . . . . . . 2-19

Usin

the PSpice OptimizerChapter 3

Chapter Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1

Activating and Loading the PSpice Optimizer . . . . . . . . . . . . . . . . . . 3-2

Activating the PSpice Optimizer . . . . . . . . . . . . . . . . . . . . . . . 3-2

From Schematics . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-2

From the Windows 95 Start Menu . . . . . . . . . . . . . . . . . . . 3-3

Changing Activation Options . . . . . . . . . . . . . . . . . . . . . . . . 3-3

Loading a Different Optimization File . . . . . . . . . . . . . . . . . . . . 3-4

The PSpice Optimizer Window . . . . . . . . . . . . . . . . . . . . . . . . . 3-5

Specifications Area . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-6

Internal specifications . . . . . . . . . . . . . . . . . . . . . . . . . . 3-6

External specifications . . . . . . . . . . . . . . . . . . . . . . . . . . 3-7

Parameters Area . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-8

Error Gauge Area . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-9

Adding and Editing Parameters . . . . . . . . . . . . . . . . . . . . . . . . 3-10

Adding a Parameter . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-10

Selecting a Parameter to Edit . . . . . . . . . . . . . . . . . . . . . . . 3-12

Adding and Editing Specifications . . . . . . . . . . . . . . . . . . . . . . . 3-13

Adding a Specification . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-13

Defining an Evaluation for an External Specification . . . . . . . . . . . 3-17

Selecting a Specification to Edit . . . . . . . . . . . . . . . . . . . . . . 3-18

Measuring and Optimizing Performance . . . . . . . . . . . . . . . . . . . . 3-18

Optimizing Your Design . . . . . . . . . . . . . . . . . . . . . . . . . . 3-18

Graphically Monitoring Progress . . . . . . . . . . . . . . . . . . . . . 3-19

Exploring the Effect of Parameter and Specification Changes . . . . . . . . 3-20

Testing Performance when Changing Current Values . . . . . . . . . . . 3-21

Automatically recalculating performance . . . . . . . . . . . . . . . 3-22

Manually recalculating performance . . . . . . . . . . . . . . . . . 3-23

Ensuring reliable results when tweaking values . . . . . . . . . . . . 3-24

Excluding Parameters and Specifications from Optimization . . . . . . . 3-24

Testing Performance when Adding or Changing Parameters or Specifications .

3-25

Saving Intermediate Values . . . . . . . . . . . . . . . . . . . . . . . . 3-26

Viewing Result Summaries . . . . . . . . . . . . . . . . . . . . . . . . . . 3-26

Producing Optimization Reports . . . . . . . . . . . . . . . . . . . . . . 3-26