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Electronics & Communication Engineering  Digital Circuits and Systems
Title: Digital Circuits and Systems
Department: Electronics & Communication Engineering
Author: Prof. S.Srinivasan
University: IIT Madras
Type: WebLink

1. Introduction

Digital Systems; Data representation and coding; Logic circuits, integrated circuits; Analysis, design and implementation of digital systems; CAD tools.

2. Number Systems and Codes

Positional number system; Binary, octal and hexadecimal number systems; Methods of base conversions; Binary, octal and hexadecimal arithmetic; Representation of signed numbers; Fixed and floating point numbers; Binary coded decimal codes; Gray codes; Error detection and correction codes ' parity check codes and Hamming code.

3. Combinatorial Logic Systems

Definition and specification; Truth table; Basic logic operation and logic gates.

4. Boolean Algebra and Switching Functions

Basic postulates and fundamental theorems of Boolean algebra; Standard
representation of logic functions ' SOP and POS forms; Simplification of switching
functions ' K'map and Quine'McCluskey tabular methods; Synthesis of combinational logic circuits.

5. Logic families

Introduction to different logic families; Operational characteristics of BJT in saturation and cut'off regions; Operational characteristics of MOSFET as switch; TTL inverter ' circuit description and operation; CMOS inverter ' circuit description and operation;Structure and operations of TTL and CMOS gates; Electrical characteristics of logic gates logic levels and noise margins, fan'out, propagation delay, transition time, power consumption and power'delay product.

6. Combinational Logic Modules and their applications

Decoders, encoders, multiplexers, demultiplexers and their applications; Parity
circuits and comparators; Arithmetic modules' adders, subtractors and ALU; Design examples.

7. Sequential Logic systems:

Definition of state machines, state machine as a sequential controller; Basic
sequential circuits' latches and flip'flops: SR'latch, D'latch, D flip'flop, JK flip'flop, T flip'flop; Timing hazards and races; Analysis of state machines using D flip'flops and JK flip'flops; Design of state machines ' state table, state assignment,
transition/excitation table, excitation maps and equations, logic realization; Design

8. State machine design approach

Designing state machine using ASM charts; Designing state machine using state
diagram; Design examples

9. Sequential logic modules and their applications

Multi'bit latches and registers, counters, shift register, application examples.

10. Memory

Read'only memory, read/write memory ' SRAM and DRAM

11. Programmable Logic Devices:

PLAs, PALs and their applications; Sequential PLDs and their applications; State'
machine design with sequential PLDs; Introduction to field programmable gate arrays (FPGAs)
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