SRM University 2007 B.Tech Electronics and Communications Engineering BANK FOR LINEAR INTEGRATED CIRCUITS - Question Paper

14. Draw the circuit diagram of triangular wave generator and provide the expression for its frequency of oscillation.
15. Distinguish ranging from a triangular waveform and saw tooth waveform.
16. For a phase shift oscillator, justify the name.
17. In an op-amp based RC phase shift oscillator, what is the minimum gain that should be maintained. Why?

PART – B
18. Explain the applications of comparator.
19. Explain the working of regenerative comparator or Schmitt trigger.
20. Draw and discuss the operation of astable multivibrator and derive an expression for its frequency of oscillation.
21. Explain working of monostable multivibrator with necessary waveforms and derive an expression for its pulse width.
22. Draw and discuss the operation of a triangular wave generator and derive an expression for its frequency of oscillation.
23. Explain the working of a saw tooth waveform generator. discuss the methods to find asymmetric square wave. (5 Marks)
24. State the necessary conditions for oscillation? Draw the circuit of Phase shift oscillator and find the expression for its frequency of oscillation and gain.
25. Draw the circuit of a Wien bridge oscillator using Op-Amp and derive an expression for its frequency of oscillation and gain.

UNIT – III ACTIVE FILTERS AND PHASE LOCKED LOOP

PART – A
1. Define a filter. How are they classified?
2. What is pass band and stop band for a filter?
3. What are the advantages of active filters over passive filters?
4. Why do we use higher order filters?
5. What is a Sallen-key filter?
6. Draw the filter response of LPF and HPF.
7. Draw the filter response of BPF and BSF.
8. Define quality factor of a BPF and discuss its significance.
9. A certain BPF has a centre frequency of 15 KHz and bandwidth of 1KHz. Determine Q and classify the filter as narrow band or wideband.
10. How are Q & BW of BPF related? discuss how the selectivity is affected by Q of a filter?
11. Explain how Butterworth, Chebyshev and Bessel response differ.
12. Define damping factor and explain its significance.
13. Name the basic parts of an active filter.
14. Discuss the order of a filter and its effect on the roll-off rate.
15. How many poles does a II order LPF have? How many resistors and how many capacitors are used in the frequency selective circuit?
16. If a three pole HPF and a single pole HPF are cascaded, what is the resulting roll-off?
17. One filter has Q=5 and a different has a Q=25. Which has the narrow bandwidth?

Earning:   Approval pending.