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**Anna University**

**Question Paper Code : 5.1397**

**B.E/B.Tech. DEGREE EXAMINATION, MAY/JUNE 2014.**

**Third Semester**

**Electronics and Communication Engineering**

**EC 2205/EC 36/080290011— ELECTRONIC CIRCUITS**

**(Common to Medical Electronics Engineering)**

**(Regulation 2008)**

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**PART-A — (10 x 2 = 20 marks)**

1. What do you mean by punch through?

2. What is thermal runaway?

3. What is Darling-ton connection?

4. Write about the characteristics of common emitter amplifier

5: What do you mean by rise time?

6. State miller's theorem.

7. What do you mean by harmonics?

8. What is conversion efficiency?

9. Draw the basic building block of linear mode power supply.

10. What is CLC filter?

**PART B — (5 x 16= 80 marks)**

11. (a) (i) Briefly describe about any two bia's compensation techniques of BJT (6)

(ii) With neat circuit diagram and needed expressions, explain, the working principle of self bias of Transistor.(10)

Or

(b) (i) What is stability? What is the need for load line and quiescent point calculation? . . (6)

(ii) Calculate the operating point of the self biased JFET haying the supply Voltage VDD =' 20V, maximum value of drain current IDSS = 10mA and VGS = –3V at ID= 4mA. Also. determine the values of resistors RD and Rs to obtain-the bias condition. (10)

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