OrCAD PSpice User's Guide.pdf

OrCAD PSpice ® A/D

User’s Guide

Trademarks

OrCAD, OrCAD Layout, OrCAD Express, OrCAD Capture, OrCAD PSpice, and

OrCAD PSpice A/D are registered trademarks of OrCAD, Inc. OrCAD Capture CIS,

and OrCAD Express CIS are trademarks of OrCAD, Inc.

Microsoft, Visual Basic, Windows, Windows NT, and other names of Microsoft

products referenced herein are trademarks or registered trademarks of Microsoft

Corporation.

All other brand and product names mentioned herein are used for identification

purposes only, and are trademarks or registered trademarks of their respective

holders.

Part Number 60-30-632

First edition 30 November 1998

Technical Support (503) 671-9400

Corporate offices (503) 671-9500

OrCAD Japan K.K. 81-45-621-1911

OrCAD UK Ltd. 44-1256-381-400

Fax (503) 671-9501

General email info@orcad.com

Technical Support email techsupport@orcad.com

World Wide Web http://www.orcad.com

OrCAD Design Network (ODN) http://www.orcad.com/odn

9300 SW Nimbus Ave.

Beaverton, OR 97008 USA

Contents

Before you begin xxvii

Welcome to OrCAD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . xxvii

OrCAD PSpice A/D overview . . . . . . . . . . . . . . . . . . . . . . . xxviii

How to use this guide . . . . . . . . . . . . . . . . . . . . . . . . . . . . . xxix

Typographical conventions . . . . . . . . . . . . . . . . . . . . . . . xxix

Related documentation . . . . . . . . . . . . . . . . . . . . . . . . . . . . xxx

Online Help . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . xxxi

If you don’t have the standard PSpice A/D package . . . . . . . . . . xxxii

If you have PSpice A/D Basics . . . . . . . . . . . . . . . . . . . . . xxxii

If you have the demo CD-ROM . . . . . . . . . . . . . . . . . . . . xxxv

OrCAD demo CD-ROM . . . . . . . . . . . . . . . . . . . . . . xxxv

What’s New . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . xxxvi

Part one

Simulation primer

Chapter 1

Things you need to know 41

Chapter overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41

What is PSpice A/D? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42

Analyses you can run with PSpice A/D . . . . . . . . . . . . . . . . . . . 43

Basic analyses . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43

DC sweep & other DC calculations . . . . . . . . . . . . . . . . . . 43

AC sweep and noise . . . . . . . . . . . . . . . . . . . . . . . . . . 44

Transient and Fourier . . . . . . . . . . . . . . . . . . . . . . . . . . 45

Advanced multi-run analyses . . . . . . . . . . . . . . . . . . . . . . . 46

Parametric and temperature . . . . . . . . . . . . . . . . . . . . . . 46

Monte Carlo and sensitivity/worst-case . . . . . . . . . . . . . . . 47

Analyzing waveforms with PSpice A/D . . . . . . . . . . . . . . . . . . . 48

What is waveform analysis? . . . . . . . . . . . . . . . . . . . . . . . . 48

Using PSpice A/D with other OrCAD programs . . . . . . . . . . . . . . 49

Using Capture to prepare for simulation . . . . . . . . . . . . . . . . 49

Contents

What is the Stimulus Editor? . . . . . . . . . . . . . . . . . . . . . . . 49

What is the Model Editor? . . . . . . . . . . . . . . . . . . . . . . . . 50

Files needed for simulation . . . . . . . . . . . . . . . . . . . . . . . . . . 50

Files that Capture generates . . . . . . . . . . . . . . . . . . . . . . . 50

Netlist file . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51

Circuit file . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51

Other files that you can configure for simulation . . . . . . . . . . . 51

Model library . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52

Stimulus file . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53

Include file . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53

Configuring model library, stimulus, and

include files . . . . . . . . . . . . . . . . . . . . . . . . . . 53

Files that PSpice A/D generates . . . . . . . . . . . . . . . . . . . . . . . 54

Waveform data file . . . . . . . . . . . . . . . . . . . . . . . . . . 54

PSpice output file . . . . . . . . . . . . . . . . . . . . . . . . . . . 54

Chapter 2

Simulation examples 55

Chapter overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55

Example circuit creation . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56

Finding out more about setting up your design . . . . . . . . . . . . 61

Running PSpice A/D . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 62

Performing a bias point analysis . . . . . . . . . . . . . . . . . . . . . 62

Using the simulation output file . . . . . . . . . . . . . . . . . . . . . 64

Finding out more about bias point calculations . . . . . . . . . . . . 65

DC sweep analysis . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 66

Setting up and running a DC sweep analysis . . . . . . . . . . . . . . 66

Displaying DC analysis results . . . . . . . . . . . . . . . . . . . . . . 68

Finding out more about DC sweep analysis . . . . . . . . . . . . . . 71

Transient analysis . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 72

Finding out more about transient analysis . . . . . . . . . . . . . . . 76

AC sweep analysis . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 77

Setting up and running an AC sweep analysis . . . . . . . . . . . . . 77

AC sweep analysis results . . . . . . . . . . . . . . . . . . . . . . . . 79

Finding out more about AC sweep and noise analysis . . . . . . . . 81

Parametric analysis . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 82

Setting up and running the parametric analysis . . . . . . . . . . . . 83

Analyzing waveform families . . . . . . . . . . . . . . . . . . . . . . 85

Finding out more about parametric analysis . . . . . . . . . . . . . . 88

Performance analysis . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 89

Finding out more about performance analysis . . . . . . . . . . . . . 91

Contents

Part two

Design entry

Chapter 3

Preparing a design for simulation 95

Chapter overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 95

Checklist for simulation setup . . . . . . . . . . . . . . . . . . . . . . . . . 96

Typical simulation setup steps . . . . . . . . . . . . . . . . . . . . . . . 96

Advanced design entry and simulation setup steps . . . . . . . . . . . 97

When netlisting fails or the simulation

does not start . . . . . . . . . . . . . . . . . . . . . . . . . . . . 98

Things to check in your design . . . . . . . . . . . . . . . . . . . . 98

Things to check in your system configuration . . . . . . . . . . . . 99

Using parts that you can simulate . . . . . . . . . . . . . . . . . . . . . . 100

Vendor-supplied parts . . . . . . . . . . . . . . . . . . . . . . . . . . 101

Part naming conventions . . . . . . . . . . . . . . . . . . . . . . . 101

Finding the part that you want . . . . . . . . . . . . . . . . . . . 102

Passive parts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 104

Breakout parts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 105

Behavioral parts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 106

Using global parameters and expressions for values . . . . . . . . . . . 107

Global parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 107

Declaring and using a global parameter . . . . . . . . . . . . . . 107

Expressions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 109

Specifying expressions . . . . . . . . . . . . . . . . . . . . . . . . 109

Defining power supplies . . . . . . . . . . . . . . . . . . . . . . . . . . . 114

For the analog portion of your circuit . . . . . . . . . . . . . . . . . . 114

For A/D interfaces in mixed-signal circuits . . . . . . . . . . . . . . 114

Default digital power supplies . . . . . . . . . . . . . . . . . . . 114

Custom digital power supplies . . . . . . . . . . . . . . . . . . . 114

Defining stimuli . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 116

Analog stimuli . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 116

Using VSTIM and ISTIM . . . . . . . . . . . . . . . . . . . . . . . 117

If you want to specify multiple stimulus types . . . . . . . . . . 118

Digital stimuli . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 119

Things to watch for . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 120

Unmodeled parts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 120

Do this if the part in question is from the OrCAD libraries . . . 120

Check for this if the part in question is custom-built . . . . . . . 122

Unconfigured model, stimulus, or include files . . . . . . . . . . . . 122

Check for this . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 123

Unmodeled pins . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 123

Check for this . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 124

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