Download AKTU B-Tech 4th Sem 2015-16 409 Analog Digital Electronics Question Paper

Download AKTU (Dr. A.P.J. Abdul Kalam Technical University (AKTU), formerly Uttar Pradesh Technical University (UPTU) B-Tech 4th Semester (Fourth Semester) 2015-16 409 Analog Digital Electronics Question Paper

Printed Pages: 4 NEC-409(A)
(Following Paper ID and Roll No. to be ?lled in your
Answer Books)
RonNoJllTlllfll
B.TECH.
Theory Examination (Semester-IV) 2015-16
ANALOG & DIGITAL ELECTRONICS
Time : 3 Hours Max. Marks : 100
Section-A
Q1. Attempt all parts. All parts carry equal marks. Write
answer of each part in short. (2XI0=20)
(a) What are the different materials used for the
manufacturing of LED?
(b) What is the drawback in S-R flip-?op? How it can
be eliminated?
(c) What are the various applications of the Multiplexer?
(d) What are the differences between Combinational and
Sequential logic circuits?
(1) P.T.O.
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(11)
Q2. Attempt any ?ve questions from this section.
(a)
(b)
What is a pn'ority encoder?
What is the Brakhausen criterion for the feedback
ampli?es?
What is the effect of negative feedback on characteris-
tics of an ampli?er?
Mention few properties of series?shunt and shunt series
feedback ampli?ers.
What is the principle of sinusoidal oscillator?
Section-B
(10x5=50)
What is a photodiode? Draw typical I-V characteristic
curves at two illumination levels and explain how does
it work as a photoresistor?
Draw the logic diagram of a two-to-four line
'decoder using NOR gates only.
An RC coupled ampli?er has a voltage gain of 1000,
fl=50Hz and f2=200 KHz and a distortion of 5%
without feedback. Find the ampli?er voltage gain, fl,
f2 and distortion when negative feedback is applied with
feedback ratio of 0.01.
(2)
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(d)
(e)
(f)
(11)
Design a combinational circuit whose input is a
four-bit number and whose output is the 2's compli-
ment of the input number. I
Explain the properties of a quartz crystal which are re-
sponsible for its use in an oscillator.
A Colpitt's oscillator is designed with C 1:100 Pf and
C2=7500 Pf. The inductance is variable. Determine
the range of inductance values, if the frequency of
oscillation is to vaiy between 750 kHz and 2050 kHz.
Findthe characteiistic equations ofall?ip-?opswiththe
help of K-map.
Explain the working of the universal shi? register.
Section-C
Note: Attempt any two questions from this section.
(15x2=3o)
Q3. Discuss the current?voltage and capacitance-voltage charac-
teristics and applications of the following:
a) Vaiactor diode
b) Tunnel diode
(3) P.T.O.
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Q4. Draw the low frequency small signal model of a transistor
in CB and CE con?gurations and explain signi?cance of
each model.
Q5. (a) What is the problem associated with the JK ?ip ?op?
How it can be overcome? Explain with necessary
diagrams.
(b) An 8?bit successive approximation ADC has a
resolution of 20mV. What will be its digital output
for an analog input of 2.17V?
(4)
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