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3 B.E./B.Tech. DEGREE EXAMINATION, NOVEMBER/DECEMBER 2010 Fourth Semester Electrical and Electronics Engineering EE 2254 LINEAR INTEGRATED CIRCUITS AND APPLICATIONS (Common to Instrumentation and Control Engineering and Electronics and PART A (10 2 = 20 Marks) Instrumentation Engineering) (Regulation 2008) Time : Three hours Maximum : 100 Marks Answer ALL questions 1. Give the difference between monolithic and hybrid ICs. 2. What is lithography? 3. Give the ideal characteristics of operational amplifier and give its equivalent circuit. 4. Draw the circuit diagram of an integrator and give its output equation. 5. Draw the circuit diagram of an op-amp based positive clipper. 6. Which is the fastest ADC and why? 7. List the applications of NE Draw the relation between the capture range and lock range relationship in a PLL. 9. How will you increase the output of a general purpose op-amp? 10. Using LM380 draw the circuit for audio power amplifier. PART B (5 16 = 80 Marks) 11. (a) (i) Briefly explain the various types of IC packages. Mention the criteria for selecting an IC package. (8) (ii) Write short notes on classification of Integrated circuits. (8) (b) With respect to the BJT based circuit given below, explain the various
4 steps to implement the circuit into a monolithic IC. (16) 12. (a) (i) With neat diagrams explain the types of feedback configurations available. (8) (ii) Briefly explain summing amplifier. Draw an adder circuit for the given expression ) ( V V V V o + + =. (8) (b) Briefly explain the frequency response of op-amp. Give the frequency compensation techniques adopted in operational amplifiers. (16) 13. (a) (i) Explain the first order lowpass Butterworth filter with a neat circuit diagram. Derive its frequency response and plot the same. (8) (ii) Design a lowpass filter with a cutoff frequency of 1 khz and with a passband gain of 2. (8) (b) What is an instrumentation amplifier? Give the important features of an instrumentation amplifier. Explain the working of three op-amp instrumentation amplifier. Give its application. (16) 14. (a) (i) Explain the Voltage Controlled Oscillator with a neat block diagram. Give its typical connection diagram and its output waveforms. (8) (ii) Derive the expression for capture range for PLL where a simple RC network is used as a LPF. (8) (b) Draw the functional diagram of IC 555 Timer. Explain with a circuit diagram how it can be connected for monostable operation. (16) 15. (a) (i) Explain the working of series voltage regulator. (8)
5 (ii) Write a note on optocouplers. (8) (b) What is a switching regulator? With a neat block diagram explain the internals of A µ (16)
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12 B.E./B.Tech. DEGREE EXAMINATION, APRIL/MAY 2010 Fourth Semester Electrical and Electronics Engineering EE2254 LINEAR INTEGRATED CIRCUITS AND APPLICATIONS (Regulation 2008) (Common to Instrumentation and Control Engineering and Electronics and Instrumentation Engineering) Time: Three hours Maximum: 100 Marks Answer ALL Questions PART A (10 2 = 20 Marks) 1. What is the purpose of oxidation process in IC fabrication? 2. What is parasitic capacitance? 3. List any four characteristics of an ideal OP-Amp. 4. Design an amplifier with a gain of 10 and input resistance of 10 k. 5. Define slew rate and state its significance. 6. An 8 bit DAC has a resolution of 20mV/bit. What is the analog output voltage for the digital input code (the MSB is the left most bit)? 7. Draw the pin diagram of IC 555 timer. 8. Mention any two application of multiplier IC. 9. List the important parts of regulated power supply. 10. What are the advantages of switch mode power supplies? PART B (5 16 = 80 Marks) 11. (a) Explain the basic processes used in silicon planar technology with neat diagram. (b) Discuss the various methods used for fabricating IC resistors and compare their performance. 12. (a) (i) Explain the functions of all the basic building blocks of an Op-Amp. (8) (ii) Explain the application of OPAMP as (1) integrator (2) differentiator. (8)
13 (b) Find 0V of the following circuit. 13. (a) Design and explain triangular wave generator using Schmitt trigger and integrator circuit. (b) (i) Explain the operation of dual slope ADC. (8) (ii) Explain the following characteristics of ADC resolution, accuracy, settling time, linearity. (8) 14. (a) With neat block diagram, explain IC566 VCO operation and discuss any two applications. (b) What are the modes of operation of IC555? Derive the expression of time delay of a monostable multivibrator. 15. (a) With a neat diagram, explain working principle of switch mode lower supply. (b) Write brief notes on: (i) IC MA (ii) Optocoupler.
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