User`s guide

vi Contents

Missing Ground . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-32

Check for this . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-32

Missing DC Path to Ground . . . . . . . . . . . . . . . . . . . . . . . . 3-33

Check for this . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-33

Creatin

and Editin

ModelsChapter 4

Chapter Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-1

What Are Models? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-3

Models defined as model parameter sets . . . . . . . . . . . . . . . . 4-3

Models defined as subcircuit netlists . . . . . . . . . . . . . . . . . . 4-3

How Are Models Organized? . . . . . . . . . . . . . . . . . . . . . . . . . . 4-4

Model Libraries . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-4

Model Library Configuration . . . . . . . . . . . . . . . . . . . . . . . . 4-5

Global vs. Local Models and Libraries . . . . . . . . . . . . . . . . . . . 4-5

Nested Model Libraries . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-6

MicroSim-Provided Models . . . . . . . . . . . . . . . . . . . . . . . . . 4-6

Tools to Create and Edit Models . . . . . . . . . . . . . . . . . . . . . . . . . 4-7

Ways to Create and Edit Models . . . . . . . . . . . . . . . . . . . . . . . . . 4-8

Using the Parts Utility to

Edit Models . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-10

Ways to Use the Parts Utility . . . . . . . . . . . . . . . . . . . . . . . 4-11

Parts-Supported Device Types . . . . . . . . . . . . . . . . . . . . . . . 4-12

Ways To Characterize Models . . . . . . . . . . . . . . . . . . . . . . . 4-13

Creating models from data sheet information . . . . . . . . . . . . . 4-13

Analyzing the effect of model parameters on device characteristics . 4-14

How to Fit Models . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-14

Running the Parts Utility Alone . . . . . . . . . . . . . . . . . . . . . . 4-16

Starting the Parts utility . . . . . . . . . . . . . . . . . . . . . . . . 4-16

Enabling and disabling automatic symbol creation . . . . . . . . . . 4-16

Saving global models (and symbols) . . . . . . . . . . . . . . . . . 4-17

Running the Parts Utility from the Symbol Editor . . . . . . . . . . . . 4-18

Starting the Parts utility . . . . . . . . . . . . . . . . . . . . . . . . 4-18

Saving global models . . . . . . . . . . . . . . . . . . . . . . . . . 4-19

Running the Parts Utility from the Schematic Editor . . . . . . . . . . . 4-20

What is an instance model? . . . . . . . . . . . . . . . . . . . . . . 4-20

Starting the Parts utility . . . . . . . . . . . . . . . . . . . . . . . . 4-21

Saving local models . . . . . . . . . . . . . . . . . . . . . . . . . . 4-21

What happens if you don’t save the instance model . . . . . . . . . 4-22

The Parts Utility Tutorial . . . . . . . . . . . . . . . . . . . . . . . . . 4-23

Creating the half-wave rectifier schematic . . . . . . . . . . . . . . 4-23

Starting the Parts utility for the D1 diode . . . . . . . . . . . . . . . 4-24