Digital electronics is a field of computer science engineering and especially electronics concerned with the study of analog and digital signals and the devices to produce them, specially built for Polytechnic Computer Science Engineering diploma Sem-3 CSE and Degree standard students. It involves a theoretical foundation of digital electronics. Many of the modern facilities like smartphones, AV systems, computers, kitchen appliances, washing machines etc. are based on digital electronics.
a) Distinction between analog and digital signal
b) Application and advantages of digital signals
a) Binary, octal and hexadecimal number system; conversion from decimal and hexadecimal to binary and vice versa.
b) Binary addition, subtraction, multiplication and division including binary points. Sign magnitude method of representation, 1’s and 2’s complement method of addition, subtraction, floating point representation
a) Concept of code, weighted and non-weighted codes, examples of BCD, excess 3 and Gray Code.
b) Concept of parity, single and double parity & error detection and correction (Hamming code).
c) Alpha numeric codes; ASCII and EBCDIC and Unicode.
a) Concept of negative and positive logic
b) Definition, symbols and truth tables of gates. Construction of NOT, AND, OR gates from NAND and NOR gates (universal gates).
c) Introduction to TTL and C MOS logic families and their sub-classification.
a) Postulates of Boolean algebra, De Morgan’s Theorem, Formulation of truth tables with Boolean equation for simple problems, Implementation of Boolean (logic) equation with gates
b) Karnaugh map (upto 4 variables) and simple application in developing combinational logic gates
a) Half adder and Full Adder circuit, design and implementation
b) Half and full abstracter circuit, design and implementation
c) 4bit adder/subtractor
d) Adder and subtractor IC (7484)
e) 2-bit comparator
a) Basic functions and block diagram of encoders and decoders
b) Basic functions and block diagram of Multiplexers and De-multiplexers. Different types of ICs
c) Four-bit decoder circuits for 7 segment display and decoder/driver ICs
a) Concept and types of latch with their working and applications
b) Operation using waveforms and truth table of RS, T,D JK and Master/Slave JK, Flip flops
c) Difference between a latch and flip flop
d) Flip flop ICs
a) Introduction to Asynchronous and Synchronous counters
b) Binary up/down counters (upto MOD-8)
c) Decade counter
d) Pre settable and programmable counters
e) Ring counter with timing diagram
f) Counter ICs
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
c) Buffer register, Tristate buffer register
d) IC 7495
a) Working principle of A/D and D/A converters
b) Detailed study of:
• Binary weighted D/A converter
• R/2R ladder D/A converter
c) Brief idea about different techniques A/D conversion and study of:
• Stair step Ramp A/D converter
• Dual Slope A/D converter
• Successive Approximation A/D converter
d) Performance characteristics of A/D and D/A converter
e) Applications of A/D and D/A converter
Memory organization, classification of semiconductor memories ( RAM, ROM, PROM, EPROM, EEPROM), static and dynamic RAM, introduction to 74181 ALUIC