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Analog Design and Simulation using OrCAD and Pspice
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Analog Design and Simulation using OrCAD and Pspice
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Analog Design and
Simulation using OrCAD
Capture and PSpice
Dennis Fitzpatrick
AMSTERDAM BOSTON HEIDELBERG LONDON NEW YORK OXFORD
PARIS SAN DIEGO SAN FRANCISCO SINGAPORE SYDNEY TOKYO
Newnes is an imprint of Elsevier
Newnes is an imprint of Elsevier
The Boulevard, Langford Lane, Kidlington, Oxford, OX5 1GB, UK
225 Wyman Street, Waltham, MA 02451, USA
First published 2012
Copyright Ó 2012 Elsevier Ltd. All rights reserved.
No part of this publication may be reproduced or transmitted in any form or by any means, electronic or
mechanical, including photocopying, recording, or any information storage and retrieval system, without
permission in writing from the publisher. Details on how to seek permission, further information about the
Publisher’s permissions policies and our arrangement with organizations such as the Copyright Clearance Center
and the Copyright Licensing Agency, can be found at our website: www.elsevier.com/permissions
This book and the individual contributions contained in it are protected under copyright by the Publisher
(other than as may be noted herein).
Notices
Knowledge and best practice in this field are constantly changing. As new research and experience broaden
our understanding, changes in research methods, professional practices, or medical treatment may become
necessary.
Practitioners and researchers must always rely on their own experience and knowledge in evaluating and
using any information, methods, compounds, or experiments described herein. In using such information or
methods they should be mindful of their own safety and the safety of others, including parties for whom they
have a professional responsibility.
To the fullest extent of the law, neither the Publisher nor the authors, contributors, or editors, assume any
liability for any injury and/or damage to persons or property as a matter of products liability, negligence or
otherwise, or from any use or operation of any methods, products, instructions, or ideas contained in the
material herein.
British Library Cataloguing in Publication Data
A catalogue record for this book is available from the British Library
Library of Congress Control Number: 2011933640
ISBN: 978-0-08-097095-0
For information on all Newnes publications
visit
our
website at www.elsevierdirect.com
Printed and bound in the United Kingdom
12
13141510987654321
Preface
The Cadence/OrCAD family of Electronic Design Automation (EDA) software
provides a complete design flow from schematic entry to circuit simulati on
through to PCB layout. The circuit is drawn using the Capture or Capture CIS
schematic editor and circuit simulations are performed using PSpice. The
schematic diagram is translated into a printed circuit board design using
Cadence Allegro or PCB Editor which has replaced OrCAD Layout. The book has
been written using the latest 16.5 software release and can be used with previous
software releases and the evaluation demo CD.
This book will benefit anybody with an interest in using the Cadence/OrCAD
professional simulation software for the design and analysis of electronic
circuits. The book provides a practical hands on approach to using the software
and at the end of each chapter there are exercises with step by step instructions to
complete.
Thanks are due to the technical staff at the University of West London, Keith
Pamment and Seth Thomas for reviewing the simulation exercises, Taranjit
Kukal and Alok Tripathi from Cadence for reviewing the technical aspects of the
book and Parallel-Systems UK for their support.
ix
Instructions
Throughout the book, bold type will indicate tool specific keywords and also
which menus to select, for example, the menu selection to create a new project is
shown below.
The instruction sequence will be, File > New > Project. The words in bold
indicate which successive menus to select from the top toolbar, as shown above.
A right mouse button click will be written as rmb. For example, select the part in
the schematic and rmb > rotate.
Bold type is also used to name any dialog box and windows that may appear. For
example, the Create PSpice Project window is shown below.
LIMITS OF ORCAD DEMO CD
The OrCAD demo CD, which is free to download or order from
www.Cadence.com, is not time limited, it is only limited in functionality and
size of the schematic. You can use the demo CD for most of the exercises in this
book. However, the number of limits from 16.5 onwards has changed.
PRE-16.5
For PSpice simulation, you are limited to 64 nodes, 20 transistors, two sub-
circuits or 65 digital primitives and 10 transmission lines (ideal or non-ideal)
with not more than four pairwise coupled lines. The maximum number of Tlines
is limited to four.
xi
The internal subcircuit nodes for opamps count towards the total node count. So
use the uA741 from the eval library on the dem o CD, which has 19 internal
nodes. For digital circuits, the maximum number of nodes is limited to 250.
In Capture you can create and view designs but cannot save designs that have
more than 64 nets or 60 parts. The Capture CIS demo database is limited to 10
parts. You cann ot create parts with more than 14 pins and you cannot save part
libraries with more than 15 parts.
The Model Editor is limited to diode models and the Model Import Wizard only
supports two pin parts and models.
The Stimulus Editor is limited to sine waves and digita l clocks.
Only simulation data creat ed in the demo version can be displayed.
The Magnetic Parts Editor can only be used to design power transformers. The
Magnetic Parts Editor supplied database cannot be edited and only contains
a single magnetic core.
POST-16.5
From 16.5 onwards, for PSpice simulation, the number of nod es has incr eased
to 75 nodes and there is no subcircuit limit.
There is no limit to stimulus generation using the Stimulus Editor.
In Capture you can create and view designs but cannot save designs that have
more than 75 nets or 60 parts.
You cannot have more than 1000 parts in the CIS database.
You cannot create parts with more than 100 pins.
Instructions
xii
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