EE2254 LINEAR INTEGRATED CIRCUITS UNIT-I IC FABRICATION
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1 DEPARTMENT OF ELECTRICAL AND ELECTRONICS ENGINEERING Question bank EE2254 LINEAR INTEGRATED CIRCUITS UNIT-I IC FABRICATION 1. Mention the advantages of integrated circuits. 2. Write down the various processes used to fabricate IC stechnology. 3. What is the purpose of etching? 4. Why aluminum is preferred for metallization? 5. What are the popular IC packages available? 6. Name the parameters which govern the thickness of the film in the oxidation process in fabrication of IC. 7. What do you mean by monolithic process? 8. List the advantages of integrated circuits over discrete component circuit 9. What are various steps involved in basic IC fabrication. 10. What are the limitations of integrated circuits? 11. What is the advantage of using dry etching process? 12. What is meant by epitaxial growth? 13. What are the advantages of etchingand masking technique? 14. Why aluminium is preferred for metallization? 15. What is masking? 16. Name the different types of IC packages. 17. Classify IC s based on the fabrication. 18. Give reason for selecting SiO 2 for diffusion process in IC fabrication.
2 19. What is meant fabrication of diodes 20. How resistors are fabricated using silicon 8 marks: 1.Explain in detail the fabrication of ICs 2.Explain the process of epitaxial growth IC fabrication with neat diagram? 3.with a neat diagram explain the process of monolithic IC technology 4.Explain the process of photolithography 5.How the IC classified into different types? 6.What is meant by etching and masking? 7.How the diodes are fabricated using silicon substrate 8.What is meant by resistor fabrication in IC technology 9.With different types of diodes explain its fabrication 10.How the capacitor is fabricated using silicon 16 marks 1. Explain the process of epitaxial growth IC fabrication with neat diagram? 2. Explain the fundamental of monolithic IC technology using suitable circuit? 3. Explain the process of photolithography. 4. With its diagram explain the diffusion of impurities. 5. What are the different ways by which the diode structure can be realized in IC?
3 UNIT-II CHARACTERISTICS OF OPAMP 2 marks questions 1. Define an operational amplifier. 2. Mention the characteristics of an ideal op-amp. 3. What happens when the common terminal of V+ and V- sources is not grounded? 4. Define input offset voltage. 5. Define input offset current. State the reasons for the offset currents at the input of the op-amp. 6. What is the need for frequency compensation in practical op-amps? 7. Mention the frequency compensation methods. 8. What are the merits and demerits of Dominant-pole compensation? 9. Define slew rate. 10. Why IC 741 is not used for high frequency applications? 11. What causes slew rate? 12. Why voltage series circuit used in IC or op-amp 13. What are the types of AC characterstics 14. Define input bias current 15. How the DC characterstics used in the OP-Amp 16. What are the applications of OP-Amp 17. Compare voltage series circuit and voltage shunt circuit 18. What is meant by frequency of op-amp 19. Draw the circuit diagram of voltage series and shunt circuit using IC 741.
4 20. Draw the circuit of summer, differentiator,integrator 8 Marks: 1. Write a brief note on frequency compensation in op-amp. 2. Explain various stability criteria of op-amp circuit. 3. What are the methods used to improve the slew rate? Briefly explain. 4. Discuss the various DC characteristic of op-amp. 5. Explain the operation of differential amplifier 6. With circuit and waveforms explain the working operation of voltage shunt Feedback amplifier. 7. Discuss the frequency response of op-amp 8. With circuit and waveforms explain the working operation of voltage series feedback amplifier. 9.Obtain the frequency response of an open-loop op-amp and discuss about the methods of frequency compensation 10. Discuss about the methods of Ac characterstics 16 marks: 1.Explain the working operation of voltage series and Voltage shunt feedback amplifier. 2.Dicuss in detail about the Dc characterstics 3. Discuss the frequency compensation methods in Ac characterstics 4.With the neat diagram explain the basic applications of op-amp 5.Discuss in detail about ideal op-amp characterstics
5 UNIT III : APPLICATION OF OP AMPS 2 Marks Questions: 1. Mention some of the linear applications of op amps : 2. Mention some of the non linear applications of op-amps:- 3. What is the need for an instrumentation amplifier? 4. List the features of instrumentation amplifier: 5. What are the limitations of the basic differentiator circuit? 6. What is a comparator? 7. What are the applications of comparator? 8. What is a Schmitt trigger? 9. What is a multivibrator? 10. What do you mean by monostable multivibrator?. 11. What is an astable multivibrator? 12. What is a bistable multivibrator? 13. What are the requirements for producing sustained oscillations in feedback circuits? 14. Mention any two audio frequency oscillators 15. What are the characteristics of a comparator? 16. What is a filter? 17. What are the demerits of passive filters? 18. What are the advantages of active filters? 19. Mention some commonly used active filters 20. List the broad classification of ADCs.
6 21. List out some integrating type converters. 22. What is integrating type converter? 23. Explain in brief the principle of operation of successive Approximation ADC. 24. What are the main advantages of integrating type ADCs? 25. Where is the successive approximation type ADC s used? 26. What is the main drawback of a dual-slope ADC? 27. State the advantages of dual slope ADC 28. Define conversion time. 29. What is a sample and hold circuit? Where it is used? 30. Define sample period and hold period. 31. What is meant by delta modulation? 8 marks: 1. Discuss the need for an instrumentation amplifier? Give a detailed analysis for the same. 2. Explain the operation of the Schmitt trigger. 3. Discuss in detail the operation of Astable multivibrator. 4. Discuss in detail the operation of Monostable multivibrator. 5. What are the requirements for producing sustained oscillations in feedback circuits? Discuss any two audio frequency oscillators. 6. What is integrating type converter? Explain the operation of dual slope ADC: 7. Explain the principle of operation of successive Approximation ADC. 8. Explain the operation of sample and hold circuit. 9. Explain the various types of digital to analog converters: 10. Explain the operation of FLASH type ADC.
7 11. How the clipper and clamper circuit used in op-amp 16 marks: 1. with a neat diagram explain about the instrumentation amplifier 2. Discuss the need for an filter? Give a detailed analysis for active filter. 3. How the A/D converter and D/A converter operating in different applications 4. Explain the detailed operation of Astable and monostable multivibrator 5. Explain the some of the applications of op-amp
8 2 marks questions UNIT IV 555 TIMER ANALOG MULTIPLIER AND PLL 1. Mention some areas where PLL is widely used: 2. Mention some applications of 555 timer: 3. List the applications of 555 timer in monostable mode of operation: 4. List the applications of 555 timer in Astable mode of operation: 5. List the basic building blocks of PLL: 6. What are the three stages through which PLL operates? 7. Define lock-in range of a PLL. 8. Define capture range of PLL. 9. Define Pull-in time. 10. Give the classification of phase detector: 11. What are the problems associated with switch type phase detector? 12. What is a voltage controlled oscillator? 13. On what parameters does the free running frequency of VCO depend on? 14. Give the expression for the VCO free running frequency. 15. Define Voltage to Frequency conversion factor. 16. What is the purpose of having a low pass filter in PLL? 17. Discuss the effect of having large capture range. 18. Mention some typical applications of PLL: 19. What is a Analog IC? Give some examples. 20. What are the merits of analog multiplier?
9 8 marks: 1. Briefly explain the block diagram of PLL and derive the expression for Lock range and capture range. 2. With a neat functional diagram, explain the operation of VCO. Also derive an expression for fo. 3. Analyze the analog multiplier IC with a neat circuit diagram. Discuss its applications. 4. Discuss the applications of PLL. 5. What is 555 timer? What are the features of 555 timer? Explain the monostable mode in detail? 6. Explain the Astable mode of operation. 7. Discuss the applications of 555 monostable timer 8. Discuss in detail about the 566 Ic 9. Explain the characterstics of 565-timer 10. Explain functional block of marks: 1. With a neat diagram explain the operation of 555 timer and its applications. 2. Dicuss in detail about the PLL functional block and its characterstics. 3. How the vco circuit operates and analyse its characterstics 4. What is meant by analog multiplier Ic?Explain its operation 5. Explain the applications special IC s
10 UNIT V SPECIAL FUNCTION ICs 2 mark questions 1. What is a voltage regulator? 2. Give the classification of voltage regulators: 3. What is a linear voltage regulator? 4. What is a switching regulator? 5. What are the advantages of IC voltage regulators? 6. Give some examples of monolithic IC voltage regulators: 7. What is the purpose of having input and output capacitors in three terminal IC regulators? 8. Define line regulation. 9. Define load regulation. 10. What is meant by current limiting? 11. Give the drawbacks of linear regulators. 12. What is the advantage of switching regulators? 13. What is an opto-coupler IC? Give examples. 14. Mention the advantages of opto-couplers: 15. What is an isolation amplifier? 16. Why opto electronic Ic operates 17. Mention types of voltage regulator? 18. How function generator operates with respect to op-amp 19. How power amplifier amplifies the circuit 20. What is meant by switching regulator
11 8 marks: 1. In detail dicuss the 723 IC general purpose voltage regulator. 2. Explain the operation of switching regulators.give its advantages. 3. With the functional diagram explain the LM 380 power amplifier. 4. Explain any one isolation amplifier IC 5. With the help of block diagram and state application of isolation amplifier IC. 6. Dicuss in detail about the operation of ICL 8038 function generator. Give its advantages. 7. Explain the operation of opto electronic ICs 8. How the opto coupler operate in IC 9. Analyse the different applications of IC with its operation 10. What is meant by MA 7840? Explain its operation 16 marks: 1. Detailed about the operation of ICL 8038 function generator and its block diagram. 2. Explain the operation LM-317 voltage regulator 3. What is meant by LM 380 power amplifier? Explain the operation of LM 380 power amplifier 4.Dicuss in detail about the optocoupler and optoelectronic IC 5.With its functional block of Functional generator
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