#1 महा REVISION | Digital Electronics | Polytechnic 3rd Semester | All India Polytechnic

#1 महा REVISION | Digital Electronics | Polytechnic 3rd Semester | All India Polytechnic #astechnic #3rdsemester #polytechnic #astechnic

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DIGITAL ELECTRONICS

1. Introduction
1.1 Distinction between analog and digital signal.
1.2 Applications and advantages of digital signals.

2. Number System
2.1 Binary, octal and hexadecimal number system: conversion from decimal and
hexadecimal to binary and vice-versa.
2.2 Binary addition and subtraction including binary points. 1’s and 2’s
complement method of addition/subtraction.

3. Codes and Parity
3.1 Concept of code, weighted and non-weighted codes, examples of 8421, BCD,
excess-3 and Gray code.
3.2 Concept of parity, single and double parity and error detection

4. Logic Gates and Families
4.1 Concept of negative and positive logic
4.2 Definition, symbols and truth tables of NOT, AND, OR, NAND, NOR, EXOR
Gates, NAND and NOR as universal gates.
4.3 SSI, MSI, LSI, VLSI
4.4 Propagation delay, Noise Margin, Fan in, Fan out, Power dissipation.
4.5 Comparison between TTL, CMOS, ECL, MOS on basis of diff parameter.
4.6 Introduction to Bipolar logic, MOS, ECL, TTL and CMOS logic families
4.7 Basic logic gate using NMOS, PMOS, CMOS

5. Logic Simplification
5.1 Postulates of Boolean algebra, De Morgan’s Theorems. Implementation of
Boolean (logic) equation with gates
5.2 Karnaugh map (upto 4 variables) and simple application in developing
combinational logic circuits

6. Arithmetic circuits
6.1 Half adder and Full adder circuit, design and implementation.
6.2 Half subtractor and Full subtractor or Circuit, design and implementation.

7. Combinational Circuit
7.1 Introduction to combinational circuit
7.2 Multiplexer, De-multiplexer, Encoder, Decoder block diagram and Circuit.
7.3 7 segment decoder
7.4 BCD Encoder Circuit

8. Introduction to Sequential circuit
8.1 Introduction to Sequential
8.2 Copmparison between combinational and sequential circuit
8.3 Concept and types of latch with their working and applications
8.4 Operation using waveforms and truth tables of RS, T, D, Master/Slave JK flip
flops.
8.5 Difference between a latch and a flip flop

9. Counters
9.1 Introduction to Asynchronous and Synchronous counters
9.2 Binary counters
9.3 Divide by N ripple counters, Decade counter, Ring counter and twisted Ring
counter.

10. Shift Register
10.1 Introduction and basic concepts including shift left and shift right.
a) Serial in parallel out, serial in serial out, parallel in serial out, parallel in
parallel out.
b) Universal shift register

11. A/D and D/A Converters
11.1 Working principle of A/D and D/A converters
11.2 Brief idea about different techniques of A/D conversion and study of :
• Simultaneous or flash type A/D converter
• Successive Approximation A/D Converter
• Single Slope A/D converter
• Dual Slope A/D converter
11.3 Brief idea of :
• Binary Weighted D/A converter
• R/2R ladder D/A converter
11.4 Applications of A/D and D/A converter.

12. Semiconductor Memories
Memory organization, classification of semiconductor memories (RAM, ROM, PROM,
EPROM, EEPROM), static and dynamic RAM.

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