Our website provides solved previous year question paper for Digital Electronics from 2012 to 2013. Doing preparation from the previous year question paper helps you to get good marks in exams. From our DE question paper bank, students can download solved previous year question paper. The solutions to these previous year question paper are very easy to understand.
1. Introduction To Digital Techniques 10 hrs
Digital circuit., Digital signal, Use of digital circuit and digital signal,
Advantages and Disadvantages of Digital circuits, Number System - Introduction to
Binary, Octal, Decimal, Hexadecimal number system. Conversion of number
systems, 1’s complement and 2’s complement, Binary arithmetic (addition,
subtraction). BCD code, BCD arithmetic (addition, subtraction).
Introduction to A/D and D/A Converters.
2. Logic Gates And Boolean Algebra 09 hrs
Logical symbol, logical expression and truth table of AND, OR, NOT, NAND,
NOR, EX- OR and EX-NOR gates, Universal gates – NAND and NOR gate,
Logical circuits of basic gates using universal gates, Basic laws of Boolean
algebra, Duality theorem, De Morgan’s theorems.
3. Combinational Logic Design / Circuits 16 hrs
Simplification of Boolean expression using Boolean algebra. Construction of
logical circuits forms Boolean expressions. Boolean expressions using Sum of
products and product of sums forms. K-map representation of logical functions.
Minimization of logical expressions using K-map ( 2, 3, 4 variables).
Standardization of SOP & POS equations. Concept of Adders / Subtractors. Truth
table, K-map, Simplified logical expression and logical circuit using basic gates and
universal gates of:
(a) Half adder and full adder.
(b) Half subtractor and full subtractor.
Block diagram, Truth table, Logical expression and logic diagram of Multiplexers
(4:1 and 8:1), Multiplexer IC. Block diagram and Truth table of Demultiplexer (1:4;
1:8; 1:16), Demultiplexer IC..
Block diagram, Truth table, working principle of Encoders & Decoders
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4. Flip Flops And Sequential Logic Design 24 hrs
One-bit memory cell, clock signal, Symbol and Logic diagram using NAND
gates, working and truth table of R S flip- flop. Symbol and Logic diagram using
NAND gates, working, truth table and timing diagram of Clocked R S flip flop.
Triggering: edge triggering and level triggering, Symbol and Logic diagram
using NAND gates, working, truth table and timing diagram of J-K flip flop.Block
diagram and truth table of Master slave J-K flip flop. Symbol, working and truth
table of D- flip flop and T-flip flop. Applications of flip flops, Concept, Modulus,
Working, truth table, timing diagram of a counter. Asynchronous counter (3 bit, 4
bit); Design of mod N-counter: working, truth table and timing diagram, 3-bit
Synchronous counter: working, truth table and timing diagram, Block diagram,
Working, Truth Table and waveforms of Shift register: SISO, SIPO, PISO, PIPO
(4-bit) and Universal Shift register (4-bit). Applications of Counters and Registers.
5. Memories 05 hrs
Classification of memories RAM, ROM, PROM, EPROM, E2PROM.Circuit
diagram and working of Static and dynamic RAM