SRM University 2007 B.Tech Electronics and Communications Engineering BANK FOR ELECTRONIC CIRCITS -II - Question Paper

6. Draw the circuit diagram of Class-AB complementary / symmetry power amplifier with its load line and discuss its operation. provide the expression for dc power input, ac power output and efficiency?
7. (a) discuss the working of Class-C power amplifier with the help of a neat circuit diagram. What is its drawback? Where can you use Class-C amplifiers?
(b) In Class-C circuit the output current flows for a period less than 180o of the input
signal. How the signal is reconstructed at the output?
8. Write a short note on Class-D amplifier.
9. (a) What is harmonic distortion? How the output signal gets distorted due to the harmonic distortion?
(b) What is the meaning of % harmonic distortion? How the total harmonic distortion is calculated?


UNIT – IV TUNED AND WIDE BAND AMPLIFIERS
PART – A
1. What is a parallel tuned circuit? When resonance does occur in tuned circuit?
2. Define resonant frequency of a tuning circuit. Write down the expression for resonant frequency.
3. Define quality factor of a parallel tuned circuit. What is the effect of Q on the resonance curve?
4. What are tuned amplifiers and where are they used?
5. Discuss the advantages of tuned amplifiers.
6. Why are tuned circuits not used for low frequency applications?
7. Why is tuned amplifier operated in class-C operation?
8. List the differences ranging from tuned amplifiers and other amplifiers.
9. Discuss briefly the frequency response of a tuned amplifier.
10. What is the relationship ranging from Q and BW of a tuned amplifier? discuss the effect of Q on the resonance curve.
11. Write a short note on coil losses in a tuned circuit.
12. Classify tuned amplifiers.
13. Briefly explain the need for parallel resonant circuits in tuned amplifiers?
14. Differentiate small signal and large signal tuned amplifiers.
15. Classify small signal tuned amplifiers.
16. Identify the differences among single tuned, double tuned and stagger tuned amplifiers.
17. The bandwidth of a single tuned amplifier is 10KHz. compute the bandwidth if three such stages are cascaded. Also compute bandwidth for 4 stages.
18. Determine the bandwidth of a three stage cascaded single tuned amplifier if the resonant frequency is 455 KHz and loaded Q of every stage is 10.
19. A tuned amplifier is designed to have a resonant frequency of 100 KHz and a bandwidth of 40 KHz. What is the Q of this amplifier?
20. The Q of a tuned amplifier is 25. If the resonant frequency of the circuit is 1400 KHz, what is its bandwidth?

Earning:   Approval pending.