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

10. Define resolution of a DAC.
11. Define Full-Scale output in DAC.
12. Draw the transfer curve of a 4-bit DAC and discuss.
13. Define settling time of D/A converter.
14. Discuss the disadvantages of weighted resistor DAC.
15. Draw the symbol for an n-bit A/D converter.
16. Define FSR of A/D converter.
17. Draw the transfer characteristics of an ideal four bit A/D converter and discuss.
18. Define conversion time of A/D converters.

PART – B
19. With a neat sketch, discuss the operation of weighted resistor DAC. (5 Marks)
20. A 4-bit DAC has VFS = 10V. Determine Vo, provided the subsequent binary inputs. (5 Marks)
a. 00012 b. 01002 c. 10002 d. 11112
2. For the 4-bit weighted resistor DAC shown below, R=80 KO and RF=8 KO. Assuming that VREF = -5V, determine the LSB size, VO(max) and VFS. (5 Marks)

21. With a neat sketch, discuss the operation of R-2R ladder DAC.
22. The R-2R ladder DAC shown beneath consists of 10K & 20KO resistors, VREF = 2V and R1 = 10KO. Determine the values needed for RF such that VFS = 10V. (5 Marks)

23. With a neat sketch, discuss the operation of inverted R-2R ladder DAC.
24. With a neat sketch, discuss flash kind ADC.
25. With a neat sketch, discuss counter kind ADC.
26. With a neat sketch, discuss successive approximation ADC.
27. With a neat sketch, discuss dual slope ADC.

UNIT-V VOLTAGE REGULATOR & TIMER
PART - A
1. What is the function of regulator?
2. What are the two kinds of regulators & how they differ in their operation?
3. What is meant by line regulation & load regulation of a voltage regulator?
4. The input of a certain regulator increases by 3.5V. As a result, the output voltage increases by 0.42V. The nominal output is 20V. Determine the line regulation in %V.
5. A regulator has a no-load output voltage of 18V and a full-load output voltage of 17.8V at a load current of 50mA. Determine voltage regulation.
6. Why series regulators are called linear voltage regulators?
7. What are the basic components in a series regulator?
8. How does the control element in shunt regulator differ from that in series regulator?
9. What is the function of series pass transistor in series op-amp regulator?
10. What are the limitations of linear voltage regulator?
11. What are three terminal regulators? List its characteristics.
12. Sketch the basic circuit of a 723 IC regulator.
13. What are the 3 terminals of a fixed voltage regulator and an adjustable voltage regulator?
14. What is the output of every of the subsequent IC regulators?
a. 7806 b. 7905.2 c. 7818 d. 7924
15. What are the external components needed for a basic LM317 configuration?
16. What are the limitations of three terminal IC regulators?
17. What is the purpose of using an external pass transistor with an IC voltage regulator?
18. What is meant by “drop-out” voltage of IC voltage regulator?
19. What are the built – in protection arrangement current in an IC 723 voltage regulator?
20. What is the advantage of current limiting in a voltage regulator?
21. How can a 3-terminal voltage regulator IC circuit replaced to give variable voltage o/p?
22. What is switching regulator? What is the primary advantage of switching regulator over linear regulator?
23. Mention the major functional blocks of switching regulator.
24. Discuss the advantages and disadvantages of switching regulators.
25. Difference ranging from general purpose & precision kind voltage regulator.
26. Define power supply ripple rejection ratio.
27. Name the five basic elements in 555 Timer IC.
28. List the important features of 555 Timer.
29. What are the 2 basic modes of operation of 555 Timer? Write the differences ranging from them.
30. What must the relationship be ranging from the pulse width tp and the period T of the input trigger signal if 555 Timer is to be used as a divide-by-4 network?
31. List 2 application every in which the 555 Timer can be used as a astable and monostable multivibrator.
32. What is the free-running frequency of oscillation of the 555 timer wired as an astable multivibrator?
33. Define duty cycle of a periodic pulse waveform. When 555 Timer is configured as an astable multivibrator, how is the duty cycle determined?
PART - B
1.
2. Explain series op-amp regulator with diagram.
3. Explain fixed voltage series regulator with its characteristics.
4. Explain functional diagram of 723 general purpose regulators.
5. Explain the current limit protection of 723 general purpose regulators.
6. Explain switching regulator in detail.
7. Draw & discuss the functional diagram of 555 timers.
8. With neat sketches of circuit diagram and waveforms, discuss the operation of 555 Timer wired as an astable multivibrator.
9. With neat sketches of circuit diagram and waveforms, discuss the operation of 555 Timer wired as a monostable multivibrator.
10. With neat sketches of circuit diagram and waveforms, discuss the operation of 555 Timer wired as a Schmitt trigger.
11. Draw the circuit of one-shot using a 555 Timer to give 1 time period of 20?s. If RA = 7.5KO, what value of C needed? (5 Marks)
12. Sketch the circuit of a 555 Timer connected as an astable multivibrator for operation at 350KHz.Dtermine the value of capacitance C needed using RA=RB=7.5KO. (5 Marks)
13. Discuss any two applications of monostable multivibrator using 555 Timer in detail.
14. Draw & discuss the functional diagram of 555 timers for astable operation.
15. Discuss any two applications of astable multivibrator using 555 Timer in detail.
16. Discuss any two applications of monostable multivibrator using 555 Timer in detail.
17. Draw and discuss the circuit of Schmitt trigger using 555 timers.

Earning:   Approval pending.