Analog Design and Simulation using OrCAD Capture and PSpice

Dennis Fitzpatrick

• Publisher: Newnes
• Year: 2011
• ISBN:
  9780080970967
• Topic: Design
• Subtopic: Industrial Design

Analog Design and Simulation using OrCAD Capture and PSpice provides step-by-step instructions on how to use the Cadence/OrCAD family of Electronic Design Automation software for analog design and simulation. Organized into 22 chapters, each with exercises at the end, it explains how to start Capture and set up the project type and libraries for PSpice simulation. It also covers the use of AC analysis to calculate the frequency and phase response of a circuit and DC analysis to calculate the circuits bias point over a range of values.

The book describes a parametric sweep, which involves sweeping a parameter through a range of values, along with the use of Stimulus Editor to define transient analog and digital sources. It also examines the failure of simulations due to circuit errors and missing or incorrect parameters, and discusses the use of Monte Carlo analysis to estimate the response of a circuit when device model parameters are randomly varied between specified tolerance limits according to a specified statistical distribution. Other chapters focus on the use of worst-case analysis to identify the most critical components that will affect circuit performance, how to add and create PSpice models, and how the frequency-related signal and dispersion losses of transmission lines affect the signal integrity of high-speed signals via the transmission lines.

Practitioners, researchers, and those interested in using the Cadence/OrCAD professional simulation software to design and analyze electronic circuits will find the information, methods, compounds, and experiments described in this book extremely useful.

• Provides both a comprehensive user guide, and a detailed overview of simulation
• Each chapter has worked and ready to try sample designs and provides a wide range of to-do exercises
• Core skills are developed using a running case study circuit
• Covers Capture and PSpice together for the first time

Chapter 1. Getting Started

Chapter Outline

1.1. Starting Capture1

1.2. Creating a PSpice Project2

1.3. Symbols and Parts7

1.3.1. Symbols7

1.3.2. Parts8

1.4. Design Templates10

1.5. Summary12

1.6. Exercises13

Exercise 113

Exercise 215

1.7. Extra Library Work17

Those of you who are familiar with setting up projects and drawing schematics in Capture may want to skip this chapter, as it has been written for those of you who have little or no experience of using Capture. This chapter will describe how to start Capture and how to set up the project type and libraries for PSpice simulation.

At the end of each chapter there are some exercises to do and as you go through the book, each chapter will build upon the exercises from previous chapters.

1.1. Starting Capture

Circuit diagrams for PSpice simulation are drawn in either Capture or Capture CIS schematic editor. The CIS option, which stands for Component Information System, allows you to select and place components from a component database instead of selecting and placing components from a library. For this book, it does not matter whether the circuits are drawn in Capture or Capture CIS.

If you have the OrCAD software installed, launch Capture or Capture CIS, by clicking on:

Start > Program Files > OrCAD xx.x > Capture

or

Start > Program Files > OrCAD xx.x > Capture CIS

where xx.x is the version number, e.g. 10.5, 11.0, 15.5, 15.7, 16.0, 16.2, 16.3 or 16.5.

At the time of writing this book, the current version is 16.5 and is started by:

Start > Program Files > Cadence > Release 16.5

If you have the Cadence software installed, the tools are installed under the Allegro platform name. In this case, only Capture CIS is available and is branded as Design Entry CIS:

Start > Program Files > Allegro SPB xx.x > Design Entry CIS

1.2. Creating a PSpice Project

New designs started in Capture will automatically create a project file (.opj) which will reference associated project files such as the schematics, libraries and output report files.

Before the circuit diagram is drawn, the project type and libraries required for the project need to be set up. First of all a new project is created by selecting from the top toolbar:

File > New > Project

In the New Project window (Figure 1.1), you enter the name of the project and then you have a choice of one of four project types:

FIGURE 1.1 Creating a new project.

• Analog or Mixed A/D is used...