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ASSIGNMENT
|
WINTER
|
2013
|
|
PROGRAM
|
BSc IT
|
|
SEMESTER
|
1
|
|
SUBJECT CODE & NAME
|
BT0064-LOGIC
DESIGN
|
|
CREDIT
|
4
|
|
BK ID
|
B0948
|
|
MAX. MARKS
|
60
|
Note: Answer all questions. Kindly note that answers for 10 marks
questions should be approximately of 400 words. Eachquestion is followed by
evaluation scheme.
Q.1Expand the following Boolean functions into their canonical form:
i. f(X,Y,Z) =XY+YZ+ X Z+ X Y
ii. f(X,Y, Z) =XY+ X Y + X YZ
Answer: Canonical Form: -The word
"canonical" simply means "standard" and it is used
throughout mathematics and science to denote some standard form for equations.
In digital electronics, Boolean equations are considered to be in canonical
form when each of the terms in the equation includes all of the possible inputs
and those terms appear in the same order as in the truth table. The canonical
form is important when simplifying a circuit.
For example, imagine the solution to a given problem generated the
following truth table:
Canonical Example #1 Inputs Output
Q.2 Explain the concepts of Gray code and Excess-3 Code with their respective
properties.
Answer: Gray code:-
The reflected binary code, also
known as Gray code after Frank Gray, is a binary numeral system where two
successive values differ in only one bit. The reflected binary code was originally
designed to prevent spurious output from electromechanical switches. Today,
Gray codes are widely used to facilitate error correction in digital
communications such as digital terrestrial television and some cable TV
systems.
The reflected binary code solves this problem by changing only one
switch at a time, so there is never any ambiguity of position:-
Q.3 Explain the working of JK flip-flop in detail.
Answer: The J-K Flip-Flop IC is used to shift data from one point
to another in a circuit in a timed fashion using a clock/strobe pulse to
control the data flow. The J-K is also used as a binary counter. The number of
bits in the counter byte is determined by the number of J-Ks that are linked
(output-to-input fashion). As a teacher I found the J-K ideal for teaching the
concepts of data shifting (control) and binary counting. My students could
underatand these concepts easily enough. However, they had great difficulty
visualizing the workings of the Flip-Flop action
Q.4 Define shift registers and explain SISO shift registers.
Answer: Shift registers: -In digital circuits, a shift register is
a cascade of flip flops, sharing the same clock, in which the output of each
flip-flop is connected to the "data" input of the next flip-flop in
the chain, resulting in a circuit that shifts by one position the "bit
array" stored in it, shifting in the data present at its input and
shifting out the last bit in the array, at each transition of the clock input.
More generally, a shift register may be multidimensional, such that it’s
"data in" and stage outputs are themselves bit arrays: this is
implemented simply by running several shift registers of the same bit-length in
parallel.
Q.5 Explain how the error correction and compression take place in modems.
Answer: When transferring data over telephone lines using a modem,
accidents can and do happen. Because the telephone network was not originally
designed to transfer data, noise on the line can cause a modem to misinterpret
the signal received from another modem causing data corruption. Under many
circumstances, such corruption can cause severe problems (money lost and data
rendered useless).
To combat such problems, the
modem incorporates two separate methods of error correction, the Microcom
Network Protocol (MNP) and the ITU-
Q.6 Explain any five common types of DAC.
Answer: A digital-to-analog converter (DAC or D-to-A) is a device
for converting a digital (usually binary) code to an analog signal (current,
voltage or charges). A DAC inputs a binary number and outputs an analog voltage
or current signal.
The most common types of electronic DAC’s are:
Dear students get fully solved
assignments
Send your semester &
Specialization name to our mail id :
“ help.mbaassignments@gmail.com ”
or
Call us at : 08263069601
(Prefer mailing. Call in emergency )
