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Posted By: SajithkumarS Member Level: Diamond Posted Date: 08 Jan 2008
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2005 Guru Gobind Singh Indraprastha University Digital Circuits and Systems Question paper
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Paper Code : ETEC – 206 Subject : Digital Circuits and Systems
Time : 3 Hours Maximum Marks : 75
Note : Attempt any 5 questions in all.
Q1
( a ) Simplify the following Boolean function: z = ( (A+B)' + B' )' [5]
( b ) Explain DeMorgan's laws. [5]
( c ) Show the logic diagram of boolean function of Q.1 a using NAND gates. [5]
Q2
( a ) Give one word answer to the following: [5]
A digital circuit that performs the inverse operation of a decoder.
A combinational circuit that receives binary information from one of 2n input lines and directs it to a single output line.
A combinational circuit that performs the arithmetic addition of two bits.
A code that can support only one bit change.
A sequential circuit that suffers from race around condition.
( b ) Design a 2 to 4 decoder using NAND gates. [5]
( c ) Compare digital signals with Analog signals, clearly stating their merits and demerits. [5]
Q3
( a ) What is the simplified boolean equation for the Karnaugh map of the figure given below: [5]
VX 00 01 11 10
YZ
00 1
01
11 1 1 1
10 1 1 1 1
( b ) Draw the equivalent logic circuit of the simplified equation. [5]
( c ) Implement a 4 to 16 decoder using ROM. [5]
Q4
( a ) Justify the following statements: [10]
Hamming code can be used to detect & correct multiple bit parity errors.
DRAM is faster than SRAM.
Packing density of CMOS logic is higher to bipolar logic.
555 timer is a digital device.
Wire ANDing is possible with TTL devices.
( b ) Explain the functioning of Mod-8 ripple counter. [5]
Q5
( a ) Differentiate between: [5x3]
PAL and PLA devices.
EPROM and EAROM.
NMOS and PMOS logic families.
Astable and Monostable multivibrators.
Synchronous and Asynchronous counters.
Q6
( a ) Find the dual of hte following expressions ( x y' + y z + x y' z) x y z [3]
( b ) What is the cannonical form of logic expression? Explain minterms and maxterms. [4]
( c ) What is a mod-5 counter. How it is designed. How a decade counter can be realized using mod-5 counter. [8]
Q7
( a ) Explain the function of a multiplexer. Give an example of multiplexer IC. [5]
( b ) What is the difference betweeen n-bit register and n-bit latch. [4]
( c ) What is a flip-flop. Explain how an S-R flip flopis realized by employing: [6]
(i) NOR gates (ii) NOR gates
Q8 Write short notes on any three of the following: [5 x 3]
( a ) Memory organization
( b ) Content Addressable Memory
( c ) Code convertors
( d ) Comparators
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