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Electronic Devices And Circuits Question Paper - Dec 18 - Electronics And Telecomm (Semester 3) - Pune University (PU)
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Electronic Devices And Circuits - Dec 18
Electronics And Telecomm (Semester 3)
Total marks: 80
Total time: 3 Hours
INSTRUCTIONS
(1) Question 1 is compulsory.
(2) Attempt any three from the remaining questions.
(3) Draw neat diagrams wherever necessary.
1.a.
Draw and explain the V-I characteristics of N-channel JFET
(6 marks)
00
1.b.
Explain the following non-ideal characteristics MOSFET :
(6 marks)
00
Finite output resistance.
Body effect
Breakdown effects.
OR
2.a.
For the circuit diagram shown in figure. Calculate $I_{D}$, $V_{DS}$, $R_{S}$:
(6 marks)
00
$I_{DSS} = 8 mA$
$V_{P} = 4 V$
$V_{GS} = -2 V $
2.b.
Write a short notes on constant source Biasing circuit using MOSFET.
(6 marks)
00
3.a.
Write a short note on MOSFET scaling.
(6 marks)
00
3.b.
Explain the MOSFET as switch In VLSL.
(6 marks)
00
OR
4.a.
For the circuit diagram shown in Figure calculate AV, Ri, Ro. The MOSFET parameters are $V_{T} = 1.5 V$, $K_{n} = 0.8 mAV^2$, $ \lambda = 0.01 V^-1$.
(6 marks)
00
4.b.
Explain the MOSFET as current sink and source circuit in VLSI.
(6 marks)
00
OR
5.a.
Draw and explain four basic types of Amplifier.
(8 marks)
00
5.b.
An Amplifier has a midband gain of 100 and a bandwidth of 200 kHz:
(5 marks)
00
If 5% negative feedback is introduced, find the new bandwidth and gain.
If the bandwidth is to be restricted to 1 MHz, find the feedback ratio.
OR
6.a.
Draw and explain Hartely oscillator using FET.
(7 marks)
00
6.b.
In a Colpitt's oscillator using FET $C_{1} = 100 PF$, $C_{2} = 10,000 PF$. If the frequency of oscillator is vary between 950 kHz and 2000 kHz. Determine the range of inductor values.
(6 marks)
00
7.a.
Explain the working of Buck type switching regulator with a neat diagram and necessary waveform. State its advantages.
(8 marks)
00
7.b.
Determine the range over which the output voltage can be varied LM317 voltage regulator if values of $R_{1} = 240 \Omega$ and $R_{2}$ is taken as $5 k \Omega$ potentiometer. Assume $I_{adj} = 100 \mu A$. Draw the typical connection diagram.
(5 marks)
00
OR
8.a.
Draw and explain block diagram of adjustable positive three-terminal voltage regulator.
(8 marks)
00
8.b.
Design an adjustable voltage regulator using LM317 for output voltage 1.25 V to 15 V and draw necessary connection diagram.
$(Assume R_{1} = 240 \Omega , I_{adjustable} = 100 \mu A)$
(5 marks)
00
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