Osmania University (OU) 2008-1st Sem B.E Information Technology .2/4(IT)suppl/e- MICRO ELECTRONIC - Question Paper

PART - A (25 marks)

1. mention at lowest 4 application of diode.

2. sketch the energy band picture for intrinsic semi conductor and extrinsic semiconductor.

3. describe her of a transistor also provide the typical value of her.

4. mention the advantages of MOSFET ore JFET.

5. describe +VE AND -VE feed back.

6. mention the advantages of class C power amplifier.

7. in which power amplifier a cross over distortion occurs?

8. among RC,LC oscillators which 1 is more stable? and why?

9. what is BW of ideal OP.Anp?

10. describe differential gain of an op.anp?

PART - B (5*10 = 50 MARKS )

11. (A) discuss the construction of pn junction diode and also its working with th help of vi characteristics
b. Draw the full wave circuits using center tapped transformer and discuss its working

12. (A) discuss the working of an transistor in CE configuration with the help if its input and output characteristic
(B) discuss the construction and working of MOSFET.
13. (A) show the +ve feedback always improves the bandwidth.
(B) show the voltages series negative feedback always improves the input.
14. draw the circuits of class A transformer coupled power amplifier and discuss it operation,. also drive the expression for efficiency under ideal conditions.

15. draw the trangular wave form generator using OP.Anp and discuss its operation with neat diagram .

16. (A) discuss bark hausen crition for oscillation to exits in a feedback amplifier.
(B) draw the circuits of collpitts oscillator and discuss its operation also provide the expression for frequency.

17 write a note on :
a. photo diode and its applications
b. biasing
c. clamping circuits

Earning:   Approval pending.