M.Sc. DEGREE EXAMINATION, NOVEMBER 2017
First Semester
Physics
ADVANCED ELECTRONICS
(CBCS 2014 onwards)
Time 3 Hours Maximum 75 Marks
Part A (10 x 2 20)
Answer all questions.
1. Draw and explain the ideal characteristic curve of a pn
junction diode.
2. Explain the operating point of a Bi-junction transistor.
3. What is meant by slew rate in an op-amp?
4. What are the limitations of an ideal differentiator?
5. What is meant by racing in the operation of a flip-flop?
6. Compare SRAM with DRAM.
7. What is the difference between a comparator and Schmitt
trigger?
8. Explain the term conversion time of an A/D converter.
9. What are the advantages of single-side hand suppressed
carrier modulation over ordinary amplitude modulation?
10. What do you understand by pre-emphasis and
de-emphasis in frequency modulation?
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Part B x 5 25)
Answer all questions, choosing either or
11. Derive an expression for the carrier concentration of
an intrinsic semiconductor.
Or
Discuss in detail the V-I characteristics of SCR.
12. Draw the ideal voltage transfer characteristics of an
op-amp and also explain. Why an op-amp behaves
like this in an open-loop configuration?
Or
Explain how first-order low pass filter can be
constructed using op-amp.
13. Explain in brief the different subfamilies of TTL
circuits.
Or
With suitable diagram, explain the basic CCD
structure and explain the charge transfer and
frequency response in detail.
14. Draw a sample and hold circuit. Explain its
operation and indicate its uses.
Or
What output voltage would be produced by a D/A
converter whose output range is 0 to 10V and whose
input binary number is
10 (for a 2 bit D/A converter)
0110 (for a 4 bit DAC)
10111100 (for a 8 bit DAC).
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15. Describe the generation and demodulation of pulse
width modulation.
Or
Explain with theory the working of an avalanche
transit time device.
Part C x 10 30)
Answer any three questions.
16. Discuss the construction, principle and working of a diode
laser.
17. Explain the working of op-amp as a log amplifier using
input and output waveforms with circuit diagram.
18. Explain the working of serial in parallel out (SIPO) shift
register with logic diagram and wave forms.
19. Draw the circuit of bistable multivibrator using IC 555
Timer. Explain its operation.
20. What is meant by amplitude modulation? Draw the
frequencing spectrum of the AM Wave. Show that the
equation of an amplitude modulated wave contains three
terms.
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