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Electronic Devices And Circuits Question Paper - Jun 17 - Electronics And Telecomm (Semester 3) - Pune University (PU)
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Electronic Devices And Circuits - Jun 17
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 drain and transfer characteristics of N-channel JFET and state various JFET parameters
(6 marks)
00
1.b.
For the circuit diagram shown in figure, the transistor
(6 marks)
00
Parameters are : $I_{DSS} = 5 mA, V_{GS(off)} = -4 V$.
Calculate the values of $R_{D}$, $R_{S}$ for $I_{D} = 2 mA$ and $V_{DS} = 6 V$.
OR
2.a.
Draw and explain the frequency response of JFET Amplifier.
(6 marks)
00
2.b.
For the circuit shown in figure, Calculate $A_{V}$, $R_{D}$, $R_{O}$
(6 marks)
00
3.a.
For NMOS E mode device $V_{TN} = 0.8 V$, $K_{n} = 0.1 mA/V^2$. The device is biased at $V_{GS} = 2.5 V$. Calculate $I_{D}$ when$V_{DS} = 2 V$ and $V_{DS} = 10 V$.
for $(a) \lambda = 0, (b) \lambda = 0.02 V^-1$.Calculate $r_{o}$ for (a) and (b).
(6 marks)
00
3.b.
Draw and explain the CMOS Inverter with Active load.
(6 marks)
00
OR
4.a.
Write short note on MOSFET Scaling.
(6 marks)
00
4.b.
Explain the working of a MOSFET as diode.
(6 marks)
00
5.a.
State the advantages and disadvantages of -ve feedback amplifier.
(4 marks)
00
5.b.
Compare various feedback topologies on the basis of $R_i$ and $R_{o}$
(4 marks)
00
5.c.
Draw the circuit diagram of Hartley oscillator and calculate $f_o$ for Hartely oscillator with $L_1 = L_2 = 100 \mu H$ and $C= 0.05 \mu F$.
(5 marks)
00
OR
6.a.
In single stage voltage amplifier $A_v = -20$, $R_i = 1 M \Omega$, $R_o = 8k$, 20% O/P voltage is feedback in series with i/p. Determine $A_{vf}$, $R_{if}$, $R_{of}$ of -ve feedback amplifier.
(6 marks)
00
6.b.
Write a short note on Colpitts oscillator using FET.
(7 marks)
00
7.a.
Draw and explain the block diagram of LM 317 and also state specification of LM 317.
(8 marks)
00
7.b.
Define line and load regulation in case of voltage regulator. What are the ideal values of the same?
(5 marks)
00
OR
8.a.
For the circuit diagram as shown in the figure. Calculate range of O/P voltage.
$(Assume I_{adj} = 50 \mu A)$
(4 marks)
00
8.b.
Draw and explain the step down switching regulator.
(5 marks)
00
8.c.
Write short note on current boosting regulator.
(4 marks)
00
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