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

18. A certain band pass filter has fo=300Hz, fU=1KHz and fL=100Hz. Would this be considered a wideband or narrow band filter?
19. A certain band pass filter has f0=3.6KHz and fL=3KHz. Determine fU and Q for this filter.
20. How a band stop response does differ from a band pass response?
21. Define a state variable filter.
22. How do we get a notch filter from a band pass filter?
23. What is PLL?
24. Draw a basic block diagram of PLL.
25. Define lock range, Capture range and pull-in time in PLL?
26. How does a PLL track the incoming frequency?
27. List the applications of PLL.
PART – B
28. Determine the critical frequency of LPF in the figure shown beneath and set the value of R1 for an approximate Butterworth response. (5 Marks)

29. Determine the centre frequency, maximum gain and bandwidth for the filter shown beneath.
(5 Marks)

30. Find bandwidth, resonant frequency and Q factor of a band pass filter with lower and upper cut-off frequency of 55 and 65Hz. (5 Marks)
31. Design a I order active Butterworth LPF at cut-off frequency of one KHz with a pass band gain of 9. (5 Marks)
32. Design a II order active Butterworth LPF at cut-off frequency of 2KHz. (5 Marks)
33. Design a IV order active Butterworth LPF at cut-off frequency of 2KHz. (Hint : I stage is a two pole filter with a damping factor of 1.848 and II stage is also a two pole filter with a damping factor 0.765) (5 Marks)
34. Design a I order active Butterworth HPF at cut-off frequency of one KHz with a pass band gain of 9. (5 Marks)
35. Design a II order active Butterworth HPF at cut-off frequency of 2KHz. (5 Marks)
36. Design a IV order active Butterworth HPF at cut-off frequency of 2KHz. (Hint : I stage is a two pole filter with a damping factor of 1.848 and II stage is also a two pole filter with a damping factor 0.765) (5 Marks)
37. Design a wide band pass filter with fL=2000Hz and fH = 10 KHz and a pass band gain of 2. compute the Q of the filter. (5 Marks)
38. Design the narrow band pass filter so that fc=10 KHz, Q=13 and AF=5. (5 Marks)
39. Design a wide band reject filter having fH = 2000Hz and fL = 10 KHz and a pass band gain of 2.
(5 Marks)
40. Design a one KHz active notch filter. (5 Marks)
41. With neat sketches, discuss the response of I order active Low Pass Filter. Derive an expression for the critical frequency. (5 Marks)
42. With neat sketches, discuss the response of II order active Low Pass Filter. Derive an expression for the critical frequency.

Earning:   Approval pending.