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explain advantages and disadvantages of ic s over discrete components

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					 INSTITUTE OF ENGINEERING AND EMERGING TECHNOLOGIES (IEET)
            MAKHNUMAJRA, BADDI, DISTT. - SOLAN (HP)


                      SHORT ANSWER TYPE QUESTIONS


Department: - ECE     Subject: -Microelec. & Linear Integrated Circuits EC-5003
Semester: - 5th       Session:-2007-2008



   1. Why does a constant current bias circuit replace emitter resistor?
   2. What type of feedback is applied to an opamp when an external component is
       connected nb/w o/p terminal and inverting i/p?
   3. What is level translator circuit? Why is it used with cascaded differential
       amplifier?
   4. What is difference b/w monolithic and hybrid ICs?
   5. Explain why open loop opamp configuration is not used in linear applications?
   6. How does negative feedback affect performance of an inverting amplifier?
   7. What is slew rate? List causes of slew rate.
   8. What is a differential amplifier? What is the advantage of using it?
   9. What is an instrumentation amplifier? List three applications of instrumentation
       amplifier.
   10. Explain difference b/w dc and ac amplifiers.
   11. Explain difference b/w dc and ac voltage followers.
   12. Define a filter. How are filters classified?
   13. List most commonly used filters.
   14. What are advantages of active filters over passive filters?
   15. What are two requirements for oscillation?
   16. What is frequency stability? Explain its significance.
   17. What is the difference b/w basic comparator and Schmitt trigger?
   18. What is a voltage limiter and why is it needed?
   19. What is a window detector?
   20. What is difference b/w A/D & D/A converter? Give one application of each.
   21. What do you mean by sample and hold circuit? Why is it needed?
   22. List important characteristics of a comparator.
   23. What is a phase locked loop? Explain using block diagram.
   24. List basic building blocks of discrete PLL.
   25. What is the major difference b/w digital and analog PLLs?
   26. Explain roles of a low pass filter and VCO in PLLs.
   27. List advantages of a switching regulator.
   28. What are four differential amplifier configurations? Which one is not commonly
       used and why?
   29. What is main advantage of constant current bias over emitter bias?
   30. What is voltage transfer curve of an opamp?
   31. What are three factors that affect the electrical parameters of an opamp?
   32. What is the working principle of oscillator?
                                                                       Prepared by:
                                                                         Jaskeerat Kaur
INSTITUTE OF ENGINEERING AND EMERGING TECHNOLOGIES (IEET)
           MAKHNUMAJRA, BADDI, DISTT. - SOLAN (HP)
 33. What is the working principle of comparator?
 34. What is the function of 555 timer?
 35. What are wave shaping circuits?
 36. What is the circuit difference b/w integrator and differentiator?
 37. Explain summing amplifier.
 38. Explain scaling amplifier.
 39. Explain averaging amplifier.
 40. Explain voltage to current converter.
 41. Explain current to voltage converter,
 42. Explain very high imput impedance circuit.
 43. What are different feedback amplifier configurations?
 44. What type of feedback should be preferred-negative or positive and why?
 45. Draw diagram of voltage series feedback.
 46. Explain diagram of voltage shunt feedback.
 47. What is a high frequency opamp?
 48. What is frequency responses of compensated and non-compensated opamps?
 49. What are current mirrors?
 50. Why do we need a level translator circuit?
 51. Draw configuration of cascaded differential amplifier.
 52. What is the drawback of cascaded differential amplifier? How can we overcome
     it?
 53. What is a FET differential amplifier?
 54. What are the differences b/w FET diff. amplifier and BJT diff. amplifier?
 55. Draw equivalent circuit of opamp.
 56. What is a practical opamp?
 57. What is the difference b/w practical and ideal opamp?
 58. What are the difference b/w active and passive components?
 59. List two special cases of inverting amplifier.
 60. Draw block diagram of feedback amplifier.
 61. What are integrated circuits? Classify them.
 62. Compare response with first order Butter worth filter and discuss differences.
 63. What are the hybrid devices?
 64. Write a difference b/w compensated and non-compensated opamps.
 65. What is differential amplifier? Draw its circuit and explain its operation.
 66. What is a cascade connection ? What current gain is provided by a darlington
     connection of 2 identical transistors each having a current gain of 190?
 67. What is the difference b/w open loop and closed loop?
 68. What is the advantage of using a negative feedback?
 69. What are the various types of negative feedback used in an opamp?
 70. What is the value of input resistance of a closed loop opamp with feedback and
     how it is related to input resistance without feedback?
 71. Explain ideal voltage transfer curve of an opamp.
 72. List various electrical characteristics of IC 741.
 73. Write expressions for voltage gain, differential resistance, output resistance of a
     single i/p balanced o/p diff. amp?
 74. Write expressions for voltage gain, differential resistance, output resistance of a
                                                                         Prepared by:
                                                                           Jaskeerat Kaur
INSTITUTE OF ENGINEERING AND EMERGING TECHNOLOGIES (IEET)
           MAKHNUMAJRA, BADDI, DISTT. - SOLAN (HP)
 75. Single i/p unbalanced o/p diff amp?
 76. Write expressions for voltage gain, differential resistance, output resistance of a
 77. Dual i/p balanced o/p diff amp?
 78. Write expressions for voltage gain, differential resistance, output resistance of a
 79. Dual i/p unbalanced o/p diff amp?
 80. Why do we use a level translator ckt?
 81. What are the three open loop configurations of an opamp?
 82. What are various types of A /D converter?
 83. Draw the basic circuit of frequency to voltage converter.
 84. What do you understand by ASIC .Explain.
 85. What are various types of present drifts in opamps?
 86. Draw block diagram representation of opamp and explain role of all its elements.
     give typical specifications of 741C and discuss.
 87. What is differential amplifier? Draw its circuit and explain its operation.
 88. Why is it that hybrid IC technology is less favoured compared to monolithic
     technology? Give at least five major advantages of monolithic technology.
 89. What are special saws that are used to slice silicon wafers?
 90. What do you mean by common mode configuration of an opamp?
 91. What does slew rate signifies and what is its value for 741C?
 92. What is input offset voltage and what is its value for 741C?
 93. What is input bias current and what is its value for 741C?
 94. What is channel separation and its value for 741C?
 95. Mention at least 3 engineering applications of clippers ,clampers and voltage
     limiters each.
 96. Obtain an expression for its AC i/p impedance and AC o/p impedance.
 97. Define SVRR and its value for 741C.
 98. Relate unity gain frequency with cut off frequency.
 99. What is voltage follower?
 100.        Why do we use a complementary push pull amplifier in the last stage of an
     opamp?




                                                                       Prepared by:
                                                                         Jaskeerat Kaur
 INSTITUTE OF ENGINEERING AND EMERGING TECHNOLOGIES (IEET)
            MAKHNUMAJRA, BADDI, DISTT. - SOLAN (HP)


                         SUBJECTIVE TYPE QUESTIONS


Department: - ECE         Subject: - Microelec. & Linear Integrated Circuits EC-5003
Semester: - 5th          Session:-2007-2008


   1.  Explain advantages and disadvantages of IC s over discrete components.
   2.  Describe monolithic diodes and their features.
   3.  Draw the basic circuit of frequency to voltage converter and explain its working.
   4.  Sketch frequency response of second order Butterworth filter.Compare response
       with first order Butterworth filter and discuss differences.
   5. What are various types of A /D converter? Sketch ckt diagram and explain
       working of any two.
   6. Explain working of voltage control oscillator.
   7. Explain opamp in following applications (a) Averaging amplifier (b)Anti-
       logarithmic amplifier
   8. Describe construction and features of MOS techniques.
   9. Explain process of silicon growth, slicing and polishing.
   10. Discuss the formation and technique of VLSI bipolar components.
   11. Describe various deposition techniques.
   12. What do you understand by ASIC .Explain.
   13. Describe the diffusion profile. What are the laws of diffusion? Explain diffusion
       system.
   14. Explain charge coupled devices.
   15. What are the hybrid devices? Explain their features.
   16. Describe thick film process.
   17. Write short notes on (a) Photo-lithography (b) Isolation technique
   18. Explain basic comparator and its characteristics.
   19. Write short notes on (a )Use of opamp as clipper and clamper (b) Phase shift
       oscillator Use of ,(c ) opamp as logarithmic amplifier.
   20. Explain working of integrator circuit.
   21. Explain sample and hold circuit.
   22. The cut off frequency of a certain first order low pass filter is 2 KHz. Convert this
       LPF to have a cutoff freq. Of 3 KHz by using freq. scaling technique. Draw
       frequency response curve for LPF.
   23. Discuss characteristics of band-pass filter.
   24. Discuss characteristics of band-stop filter.
   25. Explain difference b/w compensated and non-compensated opamps.
   26. Explain need of compensating n/w s in opamps.
   27. Discuss the following opamp applications (a) Integrator (b) Differentiator
       (c) I-V converter ,(d) Differential amplifier
   28. What are various types of present drifts in opamps? How can their effect be
       minimized?
                                                                           Prepared by:
                                                                             Jaskeerat Kaur
INSTITUTE OF ENGINEERING AND EMERGING TECHNOLOGIES (IEET)
           MAKHNUMAJRA, BADDI, DISTT. - SOLAN (HP)
 29. Discuss frequency response of an opamp.
 30. Draw block diagram representation of opamp and explain role of all its elements.
     give typical specifications of 741C and discuss it.
 31. What is differential amplifier? Draw its circuit and explain its operation . Derive
     expression for voltage gain and differential input resistance for single i/p,
     balanced o/p diff. amplifier.
 32. Derive expression for voltage gain and differential input resistance for single i/p,
     unbalanced o/p diff. amplifier.
 33. Derive expression for voltage gain and differential input resistance for dual i/p,
     balanced o/p diff. amplifier.
 34. Derive expression for voltage gain and differential input resistance for dual
     i/p,unbalanced o/p diff. amplifier.
 35. Define CMRR of a differential amplifier and explain how this can be improved.
 36. Compare and contrast merits and demerits of IC over discrete circuits. In which
     level of integration does IC 741 opamp fall?
 37. Why is it that hybrid IC technology is less favoured compared to monolithic
     technology? Give at least five major advantages of monolithic technology.
 38. Write process of wafer slicing and polishing of wafers from a growth ingot of
     silicon. What are special saws that are used to slice silicon wafers.?
 39. Sketch and explain working of a AC ckt of differential amplifier in common
     mode configuration . Derive an expression for common mode gain.
 40. Obtain a ckt for double stage RC coupled cascaded BJT amplifier. What are its
     advantages? What is a cascade connection ? What current gain is provided by a
     darlington connection of 2 identical transistors each having a current gain of 190.
 41. Explain phenomenon of o/p offset voltage due to i/p offset current in an opamp.
     Make suitable derivations.
 42. How frequency response of internally compensated opamps is different from freq.
     response of non-compensated?
 43. Explain opamp in following configurations: (a) Logarithmic amplifier (b)
     Differentiator
 44. Sketch dB response plot of second order high pass active filter and band pass
     filter. Differentiate b/w working and engineering applications of butterworth and
     chebyshev filters.
 45. Explain ladder n/w conversion for D/A conversion. Mention at least 3 engineering
     applications of clippers ,clampers and voltage limiters each.
 46. Mention 3 engineering applications of sample and hold ckt. Sketch ckt diagram of
     an absolute value detector and explain its working.
 47. Obtain AC equivalent ckt of Darlington emitter follower . Obtain an expression
     for its AC i/p impedance and AC o/p impedance.
 48. What is slew rate of an opamp? List various electrical characteristics of IC 741
     and make short notes.
 49. Explain gain v/s freq. plot of an opamp. Relate unity gain frequency with cut off
     frequency.
 50. Explain SVRR .Mention its implications of an opamp based practical ckts.



                                                                        Prepared by:
                                                                          Jaskeerat Kaur

				
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