EE 432

Title: DIGITAL ELECTRONICS

Credits: 3

Catalog Description: Basic waveshapes and fundamentals of digital electronics. Principles of Metaloxide Semiconductor (MOS) transistor, operation of MOS inverters and gate curcuits (NMOS, CMOS). Principles of bipolar junction transistors (BJT), operation of BJT inverters and gate circuits (TTL, ECL, I²L), semiconductor memories.

Prerequisite: EE 334

Coordinator: Yasemin P. Kahya, Associate Professor of Electrical Engineering

Goals: This course is designed to give seniors in electrical engineering an ability to comprehend and analyze the design and operation of digital integrated circuits. The working knowledge of different technologies is presented to give a basis of comparison of different IC structures.

Learning Objectives:

At the end of this course, students will be able to:

1. Explain and design basic inverter circuits using MOSFET, CMOS and BJT technologies.
2. Compare different logic families, their operation characteristics and IC structures.
3. Describe the operation of different load devices in MOS inverters.
4. Describe chargecontrol model of the pn junction diode and calculate diode switching times.
5. Describe Ebers-Moll model and charge-control model of the bipolar junction transistor and calculate BJT inverter switching times.
6. Describe and compare TTL, ECL and I2L logic families.
7. Compare different memory types and array structures.

Textbook: David A. Hodges, Horace G. Jackson, Analysis and Design of Digital Integrated Circuits, 2/e, McGraw-Hill Book Company, 1988

Reference Text: Thomas A. DeMassa, Zack Ciccone, Digital Integrated Circuits, John Wiley & Sons Book Company, 1996

Prerequisites by Topic:

• Basic Electronics
• Frequency-domain analysis techniques
• Multi-stage amplifiers and their frequency response
• Basic skills in PSpice

1. Basic waveshape and digital electronics fundamentals ( 1 Lecture Hour )
2. Metal-Oxide Semiconductor (MOS) Transistor Fundamentals and Operation of MOS Inverters ( 10 Lecture Hours )

1. Static NMOS Inverter Analysis
2. Transistors as Load Devices: Saturated Enhancement Load; Linear Enhancement Load; Depletion Load
3. Circuit Layout and Capacitances
4. Switcing Time Analysis and Power-Delay Product
5. CMOS Inverter Analyis
6. NMOS / CMOS Gate Circuits

3. Semiconductor Diodes, Diode Structures, Diode Switching Transients, Schottky-Barrier Diode ( 2 Lecture Hours )
4. Bipolar Junction Transistor (BJT) Fundamentals, Static and Dynamic Models and Operation of BJT inverters ( 6 Lecture Hours )
5. Bipolar Digital Gate Circuits ( 10 Lecture Hours )

1. TTL: Standard, Schottky-Clamped, Advanced Schottky-Clamped
2. ECL: 10K Series, 100K Series
3. Integrated Injection Logic
4. Interfacing Different Families

6. Semiconductor Memories ( 10 Lecture Hours )

1. Read-Only Memories: MOS and BJT ROM Cell Arrays, Decoders
2. MOS EPROM and E2PROM Cells
3. Static Read-Write Memories
4. Dynamic Read-Write Memories: Three Transistor Dynamic Cell, One Transistor Dynamic Cell
5. Serial Memories

Course Structure: The class meets for three lectures a week, each consisting of  50-minute sessions. 4-5 sets of homework problems are assigned per semester.  There are two in-class mid-term exam and a final exam. There are two PSpice assignments for circuit realization.

Computer Resources: Students are given assignments based on PSpice to realize different logic family circuits.

Laboratory Resources: The PSpice project is carried out in the computer laboratory.

Grading:

1. Two Midterms (20% each)
2. Final (40%)
3. Weekly Homework Assignments and Quizzes (10%)
4. Two homework assignments using SPICE simulation program (10%)

• Apply math, science and engineering knowledge.  This course is about general digital electronic circuit principles and applications using different logic families. Different tools from mathematics (differential equations, complex variables) in frequency domain analysis as well as from sciences (physics) in device modeling and engineering (electronics) in circuit analysis and design are heavily drawn upon during lectures, homework sets, exams and PSpice assignments.

• Design a system, component or process to meet desired needs. Designing digital circuits using different logic families constitute an important component of coursematerial. The design approach is further reinforced in Pspice assignments which involve designing digital circuits using different families.

• Ability to communicate effectively. Students are required to write a laboratory report on their PSpice assignments and part of the grade is based on the writing style, technical content and presentation quality.

• Use of modern engineering tools. Students use PSpice for their homework and project assignments.

Prepared By: Yasemin P. Kahya

Last Revised: May 26, 2003