Cadence Design Systems PSPICE SCHEMATIC User Manual

PSpice Schematics

Schematic Capture Software

User’s Guide

Trademarks

Allegro, Ambit, BuildGates, Cadence, Cadence logo, Concept, Diva, Dracula, Gate Ensemble, NC Verilog, OpenBook online documentation library, Orcad, Orcad Capture, PSpice, SourceLink online customer support, SPECCTRA, Spectre, Vampire, Verifault-XL, Verilog, Verilog-XL, and Virtuoso are registered trademarks of Cadence Design Systems, Inc.

Affirma, Assura, Cierto, Envisia, Mercury Plus, Quickturn, Radium, Silicon Ensemble, and SPECCTRAQuest are trademarks of Cadence Design Systems, Inc.

Alanza is a service mark of Cadence Design Systems, Inc.

All other brand and product names mentioned herein are used for identification purposes only and are registered trademarks, trademarks, or service marks of their respective holders.

First online edition 30 November 1999

Second online edition 31 May 2000

Cadence PCB Systems Division (PSD) offices

PSD main office (Portland) (503) 671-9500 PSD Irvine office (949) 788-6080 PSD Japan office 81-45-682-5770 PSD UK office 44-1256-381-400

PSD customer support (877) 237-4911

PSD web site www.orcad.com PSD customer support web page www.orcad.com/technical/technical.asp PSD customer support email form www.orcad.com/technical/email_support.asp

Cadence PCB Systems Division 13221 SW 68th Parkway, Suite 200 Portland, OR 97223

Before you begin xv

Welcome . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . xv

How to use this guide . . . . . . . . . . . . . . . . . . . . . . . . . . . . . xvii

Symbols and conventions . . . . . . . . . . . . . . . . . . . . . . . . xvii

Related documentation . . . . . . . . . . . . . . . . . . . . . . . . . xviii

Getting Started 1Chapter 1

Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

Using PSpice Schematics . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

Example—Drawing a Schematic . . . . . . . . . . . . . . . . . . . . . . . . 4

Starting a New Design . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

Command Line Options . . . . . . . . . . . . . . . . . . . . . . . . . . 6

Checking Symbol Libraries Configuration . . . . . . . . . . . . . . . . 7

Selecting and Placing Parts . . . . . . . . . . . . . . . . . . . . . . . . . 8

Drawing and Labeling Wires . . . . . . . . . . . . . . . . . . . . . . . 11

Drawing and Labeling Buses . . . . . . . . . . . . . . . . . . . . . . . . 12

Changing Reference Designators and Part Values . . . . . . . . . . . . 14

Moving Parts, Wires, and Text . . . . . . . . . . . . . . . . . . . . . . . 15

Placing Ports . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

Placing Power and Ground Symbols . . . . . . . . . . . . . . . . . . . 17

Saving Your Work . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

Using Design Manager 19Chapter 2

Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

Understanding Design Manager . . . . . . . . . . . . . . . . . . . . . . . . 20

Managing Your Files in the Workspace . . . . . . . . . . . . . . . . . . . . 22

Design Manager Functions . . . . . . . . . . . . . . . . . . . . . . . . . . . 23

Starting the Design Manager . . . . . . . . . . . . . . . . . . . . . . . . . . 25

Hints and Tips . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25

Design Manager Help . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25

Contents

Using the Schematic Editor 27Chapter 3

Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27

Components of a Design . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29

Parts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29

Symbols . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30

Ports . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30

Attributes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30

Annotations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30

Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31

Main Window . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32

Menus . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32

Toolbars . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33

Status Bar . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39

Refreshing the Screen . . . . . . . . . . . . . . . . . . . . . . . . . . . 39

Keyboard . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39

Configuring PSpice Schematics . . . . . . . . . . . . . . . . . . . . . . . . 41

Configuring Symbol Libraries . . . . . . . . . . . . . . . . . . . . . . 42

Changing Page Size . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49

Changing Page Settings . . . . . . . . . . . . . . . . . . . . . . . . . . 50

Changing Grid and Gravity . . . . . . . . . . . . . . . . . . . . . . . . 55

Setting the Autosave Interval . . . . . . . . . . . . . . . . . . . . . . . 58

Controlling the Display in PSpice Schematics . . . . . . . . . . . . . . . . 60

Changing Fonts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 62

Configuring Colors . . . . . . . . . . . . . . . . . . . . . . . . . . . . 63

Changing Application Settings . . . . . . . . . . . . . . . . . . . . . . 64

Changing the Get Recent Part List Size . . . . . . . . . . . . . . . . . 67

Zooming and Panning in PSpice Schematics . . . . . . . . . . . . . . . . 68

Zooming . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 68

Setting Zoom Parameters . . . . . . . . . . . . . . . . . . . . . . . . . 69

Fitting to a Page . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 70

Panning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 70

Using the Message Viewer . . . . . . . . . . . . . . . . . . . . . . . . . . 73

Online Help . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 74

Locating the Source of a Message . . . . . . . . . . . . . . . . . . . . 74

Indicated Severity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 74

Additional Information . . . . . . . . . . . . . . . . . . . . . . . . . . 76

Closing the Message Viewer . . . . . . . . . . . . . . . . . . . . . . . 76

Creating and Editing Designs 77Chapter 4

Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 77

Starting the Schematic Editor . . . . . . . . . . . . . . . . . . . . . . . . . 79

Contents

Opening a File . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 79

Finding Parts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 80

Getting Parts by Name . . . . . . . . . . . . . . . . . . . . . . . . . . . 81

Searching for Parts in the Libraries . . . . . . . . . . . . . . . . . . . . 82

Placing and Editing Parts . . . . . . . . . . . . . . . . . . . . . . . . . . . . 85

Rotating and Flipping Parts . . . . . . . . . . . . . . . . . . . . . . . . 86

Editing Part Attributes . . . . . . . . . . . . . . . . . . . . . . . . . . . 88

Global Editing of Attributes . . . . . . . . . . . . . . . . . . . . . . . . 93

Editing the Default Attributes of a Symbol . . . . . . . . . . . . . . . . 94

Repeating Part Placements . . . . . . . . . . . . . . . . . . . . . . . . . 95

Automatically Assigning Reference Designators . . . . . . . . . . . . 97

Example—Using Auto-Repeat and Auto Naming . . . . . . . . . . . . 98

Replacing Parts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 100

Placing Power and Ground Symbols . . . . . . . . . . . . . . . . . . . . 102

Placing Power and Ground Symbols . . . . . . . . . . . . . . . . . . 102

Creating Custom Power and Ground Symbols . . . . . . . . . . . . 103

Using Wires and Buses . . . . . . . . . . . . . . . . . . . . . . . . . . . . 104

Drawing and Labeling Wires . . . . . . . . . . . . . . . . . . . . . . 104

Drawing and Labeling Buses . . . . . . . . . . . . . . . . . . . . . . . 106

Automatically Labeling Wires and Buses . . . . . . . . . . . . . . . . 108

Specifying Drawing Options . . . . . . . . . . . . . . . . . . . . . . . 109

Using Ports . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 114

Selecting and Moving Objects and Attributes . . . . . . . . . . . . . . . 116

Selecting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 116

Moving . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 117

Searching for and Selecting Parts . . . . . . . . . . . . . . . . . . . . 117

Cutting, Copying, and Pasting . . . . . . . . . . . . . . . . . . . . . . 119

Creating and Editing Title Blocks . . . . . . . . . . . . . . . . . . . . . . 122

Editing Page Title . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 122

Entering Information into the Title Block . . . . . . . . . . . . . . . . 123

Creating a Custom Title Block . . . . . . . . . . . . . . . . . . . . . . 124

Adding Non-Electrical Information . . . . . . . . . . . . . . . . . . . . . 126

Text . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 126

Graphics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 130

Annotation Symbols . . . . . . . . . . . . . . . . . . . . . . . . . . . 134

Moving Non-Electrical Information . . . . . . . . . . . . . . . . . . . 135

Creating and Editing Multi-sheet Designs . . . . . . . . . . . . . . . . . 136

Adding a Page to a Design . . . . . . . . . . . . . . . . . . . . . . . . 136

Creating Connections Between Pages . . . . . . . . . . . . . . . . . . 137

Viewing Multiple Pages . . . . . . . . . . . . . . . . . . . . . . . . . 138

Cutting, Copying and Pasting Between Pages . . . . . . . . . . . . . 138

Deleting a Page . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 139

Contents

Printing Your Design . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 140

Scaling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 141

Closing the Schematic Editor . . . . . . . . . . . . . . . . . . . . . . . . . 146

Using the Symbol Editor 147Chapter 5

Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 147

Components . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 149

Symbols . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 149

Packaging Information . . . . . . . . . . . . . . . . . . . . . . . . . . 149

Footprints . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 150

Simulation Models . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 150

Starting the Symbol Editor . . . . . . . . . . . . . . . . . . . . . . . . . . 151

Loading a Library for Editing . . . . . . . . . . . . . . . . . . . . . . 151

Saving your Changes . . . . . . . . . . . . . . . . . . . . . . . . . . . 152

Returning to the Schematic Editor . . . . . . . . . . . . . . . . . . . . 152

Starting Automatically . . . . . . . . . . . . . . . . . . . . . . . . . . 152

Symbol Editor Window . . . . . . . . . . . . . . . . . . . . . . . . . . . . 153

Refreshing the Screen . . . . . . . . . . . . . . . . . . . . . . . . . . . 153

Menus . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 153

Toolbar . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 154

Title Bar . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 156

Keyboard . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 157

Changing Text Characteristics . . . . . . . . . . . . . . . . . . . . . . . . 158

Attribute Text . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 158

Pin Name and Number . . . . . . . . . . . . . . . . . . . . . . . . . . 160

Free-Standing Text . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 161

Changing Grid and Gravity . . . . . . . . . . . . . . . . . . . . . . . . . . 162

Grid On . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 162

Stay-on-Grid . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 162

Snap-to-Grid . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 163

Grid Spacing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 163

Gravity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 164

Text Grid . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 165

Zooming and Panning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 166

Printing Symbols . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 167

Creating and Editing Symbols 169Chapter 6

Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 169

Creating New Symbols . . . . . . . . . . . . . . . . . . . . . . . . . . . . 171

Using the Symbol Wizard . . . . . . . . . . . . . . . . . . . . . . . . . 171

Creating a Symbol by Copying Another Symbol . . . . . . . . . . . . 173

Contents

Making a Copy of a Symbol . . . . . . . . . . . . . . . . . . . . . . . 173

Importing a symbol definition . . . . . . . . . . . . . . . . . . . . . . 174

Using AKO Symbols . . . . . . . . . . . . . . . . . . . . . . . . . . . 175

Drawing Symbol Graphics . . . . . . . . . . . . . . . . . . . . . . . . . . 178

Elements of a Symbol . . . . . . . . . . . . . . . . . . . . . . . . . . . 178

Selecting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 182

Filling Shapes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 183

Ordering Drawing Objects . . . . . . . . . . . . . . . . . . . . . . . . 184

Rotating and Flipping Elements . . . . . . . . . . . . . . . . . . . . . 185

Moving . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 187

Resizing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 187

Editing Existing Symbols . . . . . . . . . . . . . . . . . . . . . . . . . . . 188

Accessing Symbols . . . . . . . . . . . . . . . . . . . . . . . . . . . . 188

Cutting, Copying, and Pasting . . . . . . . . . . . . . . . . . . . . . . 189

Defining and Editing Pin Types . . . . . . . . . . . . . . . . . . . . . . . 191

Specifying Pin Types . . . . . . . . . . . . . . . . . . . . . . . . . . . 191

Defining and Editing Hidden Power and Ground Pins . . . . . . . . 194

Changing Symbol Origin and Bounding Box . . . . . . . . . . . . . 195

Editing Symbol Attributes . . . . . . . . . . . . . . . . . . . . . . . . . . 197

Using Symbol Aliases . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 200

Specifying Part Packaging Information . . . . . . . . . . . . . . . . . . . 201

Pin Assignment Lists . . . . . . . . . . . . . . . . . . . . . . . . . . . 201

Packaging Definitions . . . . . . . . . . . . . . . . . . . . . . . . . . . 202

Creating a New Package Definition . . . . . . . . . . . . . . . . . . . 202

Copying a Package Definition . . . . . . . . . . . . . . . . . . . . . . 203

Editing a Package Definition . . . . . . . . . . . . . . . . . . . . . . . 204

Deleting a Package Definition . . . . . . . . . . . . . . . . . . . . . . 211

Configuring Package Types . . . . . . . . . . . . . . . . . . . . . . . 212

Configuring Custom Libraries . . . . . . . . . . . . . . . . . . . . . . . . 214

Example—Creating Symbols from Scratch . . . . . . . . . . . . . . . . . 216

Diode Bridge Rectifier . . . . . . . . . . . . . . . . . . . . . . . . . . 216

Creating and Editing Hierarchical Designs 225Chapter 7

Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 225

Hierarchical Design Methods . . . . . . . . . . . . . . . . . . . . . . . . 227

Creating and Editing Hierarchical Blocks . . . . . . . . . . . . . . . . . . 228

Associating an Existing Schematic . . . . . . . . . . . . . . . . . . . . 232

Creating and Editing Hierarchical Symbols . . . . . . . . . . . . . . . . 233

Creating a Hierarchical Symbol . . . . . . . . . . . . . . . . . . . . . 233

Converting Hierarchical Blocks to Symbols . . . . . . . . . . . . . . 235

Using Interface Ports . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 236

vii

Contents

Setting Up Multiple Views . . . . . . . . . . . . . . . . . . . . . . . . . . 237

Translators . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 237

Navigating Through Hierarchical Designs . . . . . . . . . . . . . . . . . 239

Assigning Instance-Specific Part Values . . . . . . . . . . . . . . . . . . . 241

Passing Information Between Levels of Hierarchy . . . . . . . . . . . . . 242

Example—Creating a Hierarchical Design . . . . . . . . . . . . . . . . . 244

Drawing the Top-Level Schematic . . . . . . . . . . . . . . . . . . . . 244

Drawing the Lower-Level Schematic . . . . . . . . . . . . . . . . . . 248

Preparing Your Design for Simulation 253Chapter 8

Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 253

Creating Designs for Simulation and Board Layout . . . . . . . . . . . . 255

Specifying Part Attributes . . . . . . . . . . . . . . . . . . . . . . . . . 255

Handling Unmodeled Pins . . . . . . . . . . . . . . . . . . . . . . . . 256

Specifying Simulation Model Libraries . . . . . . . . . . . . . . . . . . . 257

Editing Simulation Models from PSpice Schematics . . . . . . . . . . . . 258

Adding and Defining Stimulus . . . . . . . . . . . . . . . . . . . . . . . . 259

Placing Stimulus Sources . . . . . . . . . . . . . . . . . . . . . . . . . 259

Using the Stimulus Editor . . . . . . . . . . . . . . . . . . . . . . . . . 259

Setting Up Analyses . . . . . . . . . . . . . . . . . . . . . . . . . . . . 260

Creating a Simulation Netlist . . . . . . . . . . . . . . . . . . . . . . . 260

Starting the Simulator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 266

Viewing Results . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 267

Viewing Bias Point Results . . . . . . . . . . . . . . . . . . . . . . . . 267

Viewing Results as You Simulate . . . . . . . . . . . . . . . . . . . . 267

Using Markers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 268

Configuring Probe Display of Simulation Results . . . . . . . . . . . 269

viii

Using Design Journal 271Chapter 9

Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 271

Understanding Design Journal . . . . . . . . . . . . . . . . . . . . . . . . 272

Design Journal Help . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 273

Preparing Your Design for Board Layout 275Chapter 10

Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 275

Connectors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 277

Placing Connectors . . . . . . . . . . . . . . . . . . . . . . . . . . . . 277

Creating Single-Pin Connector Symbols . . . . . . . . . . . . . . . . . 279

Packaging the Parts in Your Design . . . . . . . . . . . . . . . . . . . . . 280

Assigning Reference Designators Manually . . . . . . . . . . . . . . 281

Assigning Reference Designators Automatically . . . . . . . . . . . . 283

Contents

Setting Package Class Priorities . . . . . . . . . . . . . . . . . . . . . 284

Generating a Bill of Materials Report . . . . . . . . . . . . . . . . . . . . 286

Printing and Saving the Report . . . . . . . . . . . . . . . . . . . . . 287

Customizing the Format of the Report . . . . . . . . . . . . . . . . . 288

User Defined Component Information . . . . . . . . . . . . . . . . . 289

Exporting to a Spreadsheet or Database Program . . . . . . . . . . . 290

Swapping Pins . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 291

Interfacing to Board Layout Products . . . . . . . . . . . . . . . . . . . . 292

Layout Mapping Files . . . . . . . . . . . . . . . . . . . . . . . . . . . 294

Back Annotation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 298

Exporting DXF Files 301Appendix A

Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 301

Exporting DXF Files . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 302

Exporting from the Schematic Editor . . . . . . . . . . . . . . . . . . . . 303

Exporting in the Symbol Editor . . . . . . . . . . . . . . . . . . . . . . . 304

Library Expansion and Compression Utility 305Appendix B

Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 305

Using the Library Utility . . . . . . . . . . . . . . . . . . . . . . . . . . . 306

Expanding Library Definitions into Text Files . . . . . . . . . . . . . . . 307

Compressing Definition Files into a Library . . . . . . . . . . . . . . . . 307

Salvaging a Corrupted File . . . . . . . . . . . . . . . . . . . . . . . . . . 308

Reorganizing a Library File . . . . . . . . . . . . . . . . . . . . . . . . . . 308

lst File Format . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 308

Running LXCWin Using Command Line Options . . . . . . . . . . . . . 309

Advanced Netlisting Configuration Items 311Appendix C

Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 311

Specifying PSpice Node Name Netlisting Preferences . . . . . . . . . . 312

Specifying Board Layout Node Name Netlisting Preferences . . . . . . 313

Customizing EDIF Netlists . . . . . . . . . . . . . . . . . . . . . . . . . . 314

Attribute List 315Appendix D

Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 315

Symbol Libraries 321Appendix E

Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 321

Using Symbol Libraries . . . . . . . . . . . . . . . . . . . . . . . . . . . . 322

Contents

Glossary 331

Index 337

Figures

Figure 1 Interaction of Sim Software Programs and Files . . . . . . . . . . . . . . . 3

Figure 2 Opto-isolated, Addressable Serial-to-parallel Converter Circuit . . . . . . 5

Figure 3 Border Styles . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50

Figure 4 Placing Resistors with Various Vertical and Horizontal Offsets . . . . . . 96

Figure 5 Auto Naming for Bus Labels . . . . . . . . . . . . . . . . . . . . . . . . . . 98

Figure 6 Orthogonal Wire Drawing . . . . . . . . . . . . . . . . . . . . . . . . . . 109

Figure 7 Rubberbanding with Orthogonal enabled . . . . . . . . . . . . . . . . . 112

Figure 8 Rubberbanding with Orthogonal disabled . . . . . . . . . . . . . . . . . 112

Figure 9 Rubberbanded path showing a potential connection . . . . . . . . . . . 113

Figure 10 Off-page Port . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 114

Figure 11 Global Ports . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 114

Figure 12 Selection rectangle . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 116

Figure 13 Printing with Auto-Fit Enabled . . . . . . . . . . . . . . . . . . . . . . . 142

Figure 14 Zoom Factor Set to 100% with Printer Configured in Portrait Mode . . 142 Figure 15 Zoom Factor Set to 200% with Printer Configured in Portrait Mode . . 143

Figure 16 User-definable Zoom Enabled in Portrait Mode . . . . . . . . . . . . . . 144

Figure 17 User-definable Zoom Enabled in Landscape Mode . . . . . . . . . . . . 145

Figure 18 Pin Types . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 191

Figure 19 Example of Diode Bridge Rectifier Symbol . . . . . . . . . . . . . . . . . 217

Figure 20 Top-level Schematic Drawing for CMOS Inverter . . . . . . . . . . . . . 244

Figure 21 Schematic of CMOS Inverter . . . . . . . . . . . . . . . . . . . . . . . . . 248

Figure 22 A Working Schematic and Two Checkpoint Schematics . . . . . . . . . 273

Figure 23 Entire Connector Symbol . . . . . . . . . . . . . . . . . . . . . . . . . . . 278

Figure 24 Single Pin Symbol . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 278

Figure 25 Bill of Materials Report . . . . . . . . . . . . . . . . . . . . . . . . . . . . 286

Figures

xii

Tables

Table 1 Remaining Parts to be Placed . . . . . . . . . . . . . . . . . . . . . . . . . . 10

Table 2 Standard Schematics Toolbar . . . . . . . . . . . . . . . . . . . . . . . . . . 33

Table 3 Drawing Toolbar . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35

Table 4 Simulation Toolbar . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36

Table 5 Annotation Graphics Toolbar . . . . . . . . . . . . . . . . . . . . . . . . . 38

Table 6 Schematic Editor Function Keys . . . . . . . . . . . . . . . . . . . . . . . . 40

Table 7 Zoned Border Default Decimal Parameters . . . . . . . . . . . . . . . . . . 51

Table 8 Zoned Border Default Metric Parameters . . . . . . . . . . . . . . . . . . . 51

Table 9 Attribute Text Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . 92

Table 10 Symbol Editor Toolbar Buttons . . . . . . . . . . . . . . . . . . . . . . . 154

Table 11 Symbol Editor Function Keys . . . . . . . . . . . . . . . . . . . . . . . . 157

Table 12 Display Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . 159

Table 13 Content Options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 168

Table 14 Distinctions Between Connectors and Ports . . . . . . . . . . . . . . . . 277

Table 15 Supported Layout Packages and File Formats . . . . . . . . . . . . . . . 292

Table 16 .

lst File Format . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 308

Before you begin

Welcome

Orcad family products offer a total solution for your core design tasks: schematic- and VHDL-based design entry; FPGA and CPLD design synthesis; digital, analog, and mixed-signal simulation; and printed circuit board layout. What's more, Orcad family products are a suite of applications built around an engineer's design flow—not just a collection of independently developed point tools. PSpice Schematics is just one element in our total solution design flow.

PSpice Schematics is a schematic capture front-end program with a direct interface to PSpice.

In one environment, you can do all of the following using PSpice Schematics:

• design and draw circuits

• simulate circuits using PSpice

• analyze simulation results using Probe

Chapter Before you begin

• graphically characterize simulation stimuli using the

fully integrated PSpice Stimulus Editor, so stimulus definitions are automatically associated with the appropriate symbols

• graphically characterize simulation models using the

fully integrated PSpice Model Editor utility, so model definitions are automatically associated with the appropriate symbols

• interface to PSpice Optimizer for analog circuit

performance optimization

• interface to PCB programs for printed circuit board

layout

PSpice Schematics is fully integrated with PSpice, giving you the flexibility to work through your circuit design in a consistent environment.

How to use this guide

This guide is designed so you can quickly find the information you need to use PSpice Schematics. To help you learn and use PSpice Schematics efficiently, this manual is separated into the following sections:

• Chapter 1 - Getting started

• Chapter 2 - Using Design Manager

• Chapter 3 - Using the schematic editor

• Chapter 4 - Creating and editing designs

• Chapter 5 - Using the Symbol Editor

• Chapter 6 - Creating and editing Symbols

• Chapter 7 - Creating and editing hierarchical designs

• Chapter 8 - Preparing your design for simulation

• Chapter 9 - Using Design Journal

How to use this guide

• Chapter 10 - Preparing your design for board layout

Symbols and conventions

Our printed documentation uses a few special symbols and conventions.

Notation Examples Description

C+r Press C+r. Means to hold down the C key while

pressing r.

A, f, o From the File menu, choose Open (A, f,

o).

Monospace font

In the Part Name text box, type PARAM. Text that you type is shown in

Means that you have two options. You can use the mouse to choose the Open command from the File menu, or you can press each of the keys in parentheses in order: first A, then f, then o.

monospace font. In the example, you type the characters P, A, R, A, and M.

Chapter Before you begin

UPPERCASE In Capture, open CLIPPERA.DSN. Path and filenames are shown in

uppercase. In the example, you open the design file named CLIPPERA.DSN.

Italics In Capture, save design_name.DSN. Information that you are to provide is

shown in italics. In the example, you save the design with a name of your choice, but it must have an extension of .DSN.

Getting Started

Overview

This chapter describes Schematics: what it is, what it can do, and how you can use it.

This chapter has the following sections:

Using Schematics

and describes various functions.

Example—Drawing a Schematic

step-by-step example of creating a schematic.

on page 1-2 provides a broad overview

on page 1-4 provides a

Chapter 1 Getting Started

Using Schematics

Schematics is a schematic capture front-end program that provides a convenient system for:

• creating and managing circuit drawings.

• setting up and running simulations.

• evaluating simulation results using MicroSim Probe.

• creating netlists for external PCB layout packages.

An important prerequisite to building a schematic is availability of proper symbols for assembly. Schematics has extensive symbol libraries and a fully integrated symbol editor for creating your own symbols or modifying existing symbols.

The main functions of Schematics are:

• creating and editing designs

• creating and editing symbols

• creating and editing hierarchical designs

• preparing a design for simulation

• preparing a design for board layout

These primary functions are described in the following chapters.

Using Schematics

packages

symbols

models

package definitions

symbol definitions

circuit

file

netlist & simulation directives

layout netlist file

PSpice Schematics

component description file

PCB Layout

netlist & packaging information

footprints

layout ECO file

back annotation

Probe

Probe markers

Bill of

Figure 1 Interaction of Sim Software Programs and Files

Materials reports

PSpice A/D

simulation results

simulation

audit

simulation output file

Probe data file

Chapter 1 Getting Started

Example—Drawing a Schematic

The following example demonstrates the basic drawing features for drawing a schematic. It shows you how to:

• start the schematic editor and begin a new design.

• find out which libraries are configured for Schematics.

• place parts on a schematic.

• connect the part using wires and buses.

• label wires and buses.

• change reference designators and part values.

• move parts, wires and text.

• use ports on a schematic.

• place power and ground symbols on a schematic.

• save your design.

Follow this example to create the circuit shown in Figure 2.

Example—Drawing a Schematic

Figure 2 Opto-isolated, Addressable Serial-to-parallel Converter Circuit

Chapter 1 Getting Started

Starting a New Design

Start the schematic editor by double-clicking on the Schematics icon in the Orcad program group. An empty schematic page displays.

If you already have Schematics running with another schematic displayed, click the New File icon to start a new schematic.

Command Line Options

PSpice Schematics supports a number of command line options that enable you to customize the start-up mode. You can add one or more of these options to the Command Line text box of the Program Item Properties dialog box (File/Properties from within the Program Manager) for the Windows Schematics program icon.

The command line options are:

Option Description

-i <filename.ini> activates Schematics using a specific file

(specified by <filename.ini>) for configuration settings, rather than the default: pspice.ini

-sym activates Schematics with a new Symbol Editor document window

<filename> activates Schematics and loads the

schematic file specified by <filename.sch>

Checking Symbol Libraries Configuration

When you installed Schematics, you selected a set of libraries to be installed. These are global libraries, which means the symbols contained in them are available to be used in any new or existing schematic.

Check to see that you have the correct symbol libraries configured for this example:

1 From the Options menu, select Editor Configuration.

Example—Drawing a Schematic

2 Check that the following libraries are included in the

Libraries list box:

7400 [.slb,.plb] analog [.slb,.plb] opto [.slb,.plb] port [.slb] 1_SHOT [.slb]

Note If you are using the evaluation

version of Schematics, you will be using “eval.slb”.

Chapter 1 Getting Started

One of two Part Browser dialog boxes may appear: the Part Browser Advanced or the Part Browser Basic. If in the Part Browser Advanced dialog appears, click <<Basic to display the Part Browser Basic.

e Full List in the Part Browser dialog box represents all the parts in the configured symbol libraries that are available for your use.

Selecting and Placing Parts

1 From the Draw menu, select Get New Part to display

the Part Browser dialog box.

Another method of selecting a part is to use the Get Recent Part list box on the toolbar. You can scroll and select a previously placed part, or you can type the name of the part you want to place.

2 There are several ways to select a part in the Part

Browser dialog box:

• If you know the name of the part, type the name in

the Part Name text box.

• Select the part name from the Full List of part

names.

• Click Libraries to view the Library Browser dialog

box, select a library, and select the part name from that library’s list of parts.

3 Click Place to place the part (with the browser

remaining open) or click Place & Close (to place the part and close the browser). If you leave the browser open, click the title bar of the dialog box and drag it to a new location.

Placing resistors R1 and R2

1 From the Draw menu, select Get New Part to display

the Part Browser dialog box (shown on 1-8

Example—Drawing a Schematic

2 Type

R in the Part Name text box.

3 Click Place & Close.

The outline of the resistor becomes attached to the pointer.

Note that as you move the pointer, the X and Y coordinates at the left of the Status Bar (bottom of the window) change. These coordinates show the location of the pointer from origin 0,0 (upper left corner) to the closest 0.01 inch (or closest mm if you are using a metric page size).

4 Press C+R to rotate the resistor before placing it.

5 Move the pointer to the 2.40, 1.80 coordinates (within

a few hundredths of the inch is close enough) and click to place the resistor on the schematic. If the Stay-on-Grid option is enabled, parts are automatically placed on the nearest grid point.

6 Move the pointer to 2.40, 3.90 and click again to place

the second resistor on the schematic.

7 Right-click to stop placing the part.

Placing resistors R3 through R6

You can quickly place resistors R3 through R6 using the Auto-Repeat function.

1 From the Options menu, select Auto-Repeat to display

the Auto-Repeat dialog box.

a Set Horizontal Offset to 00.00 and Vertical Offset

to -00.20.

b Select the Enable Auto-Repeat check box.

c Click OK.

2 From the Get Recent Part list box on the toolbar, select

As you place parts, the numerical portion of the reference designator is automatically assigned. For instance, if you place resistor R2, the next resistor you place will be designated R3.

Chapter 1 Getting Started

Tabl

e 1 Remaining Parts to be

Placed

3 Place the pointer in the approximate position for the

placement of R3 and click to place the part.

4 Press M three times to place three more resistors

above the first.

Placing resistors R7 through R10

1 From the Get Recent Part list box on the toolbar, select

2 Press C+R to rotate the resistor before placing it.

Reference Designator

U2 A4N25

U3 74164

U4 74164

U5 74174

U6 74174

U7 7485

Part Name

A4N25

3 Place four resistors in the approximate locations of R7,

R8, R9, and R10.

4 Right-click to stop placing resistors.

Placing the remaining parts on the schematic

1 Click the Get New Part button.

2 In the Part Browser dialog box, select each part listed

in Table 1 from the Part list box.

3 Place the part on the schematic in the approximate

location shown in Figure 2.

+ 342 hidden pages

Cadence Design Systems PSPICE SCHEMATIC User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual

Contents

Figures

Tables

Before you begin

Welcome

How to use this guide

Symbols and conventions

Related documentation

Getting Started

Overview

Using Schematics

Example—Drawing a Schematic

Starting a New Design

Command Line Options

Checking Symbol Libraries Configuration

Selecting and Placing Parts