R05221002-linear-ic-applications

Set No. 1

Code No: R05221002

II B.Tech Supplimentary Examinations, Aug/Sep 2008 LINEAR IC APPLICATIONS (Electronics & Instrumentation Engineering) Time: 3 hours Max Marks: 80 Answer any FIVE Questions All Questions carry equal marks ⋆⋆⋆⋆⋆ 1. (a) Explain how large open circuit voltage gain of an op - amp can be obtained by using cascading of differential amplifier stages. (b) Explain ac analysis of differential amplifier. [8+8] 2. (a) Draw the equivalent circuit of an op - amp. (b) List out the ideal characteristics of an op - amp. (c) Explain in detail all the dc and ac characteristics of an ideal op - amp with relevant expressions. [3+3+10] 3. (a) What are the advantages of instrumentation amplifier? Derive an expression for the transfer function of an instrumentation amplifier. (b) Explain the use of reference terminal provided in an integrated circuit instrumentation amplifier. [10+6] 4. (a) Design a logarithmic amplifier for positive input voltages in the range 5mV to 50V. (b) With suitable circuit diagram explain the operation of a triangular wave generator using a comparator and a integrator. [8+8] 5. (a) Derive an expression for the voltage to frequency conversion factor of 566 VCO. (b) What is pass band and stop band for a filter? How are filters are classified. [8+8] 6. Describe any two applications of 555 timer in (a) Astable multivibrator configuration (b) Monostable multivibrator configuration.

[8+8]

7. Write shorts on: (a) Tracking type analog to digital converters. (b) Comparison of conversion times and hardware complexities of various analog to digital converters. [8+8] 8. (a) Give the working principle of Analog multiplexer. Give block diagram of a 16 input analog multiplexer using CMOS gated and explain how it works. (b) Explain the operation of sample and hold circuit using neat sketch. [8+8] ⋆⋆⋆⋆⋆ 1 of 1

Set No. 2

Code No: R05221002

II B.Tech Supplimentary Examinations, Aug/Sep 2008 LINEAR IC APPLICATIONS (Electronics & Instrumentation Engineering) Time: 3 hours Max Marks: 80 Answer any FIVE Questions All Questions carry equal marks ⋆⋆⋆⋆⋆ 1. (a) List out different configurations of differential amplifier. Explain any one of them in detail. (b) Determine the emitter current in transistor Q3 of figure 1. If VBE = 0.7V and β = 100. [10+6]

Figure 1 2. (a) Explain the differences between ac and dc amplifiers. (b) What are the differences between the inverting and non-inverting terminals? What do you mean by the term “virtual ground”? (c) List out different types specifications of practical op - amp.

[4+6+6]

3. (a) How the operational amplifier can be used as a differentiator and integrator. (b) Explain how an operational amplifier can be used as summing amplifier.[8+8] 4. (a) Design a logarithmic amplifier for positive input voltages in the range 5mV to 50V. (b) With suitable circuit diagram explain the operation of a triangular wave generator using a comparator and a integrator. [8+8] 1 of 2

Set No. 2

Code No: R05221002

5. (a) Draw the schematic diagram of Wein bridge oscillator and derive the expression for frequency of oscillation. (b) What are the conditions to be satisfied by a circuit to produce oscillations? [10+6] 6. Draw the functional block diagram of 555 IC timer. Explain the function of each block so also explain hoe it can be used as monostable multivibrator. Draw the circuit and explain its operation with neat relevant waveforms and derive the pulse width. [16] 7. (a) What are the basic blocks preceding an Analog to Digital converter in a typical application like digital audio recording? (b) With the help of a neat circuit diagram and waveforms, explain the operation of a dual slope ADC. What are its special features? [6+10] 8. (a) What are the different types of multiplexers? Explain logic diagram and truth table of Dual 4 to 1 line multiplexer. (b) Explain the operation of balanced modulator using neat sketch. ⋆⋆⋆⋆⋆

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[10+6]

Set No. 3

Code No: R05221002

II B.Tech Supplimentary Examinations, Aug/Sep 2008 LINEAR IC APPLICATIONS (Electronics & Instrumentation Engineering) Time: 3 hours Max Marks: 80 Answer any FIVE Questions All Questions carry equal marks ⋆⋆⋆⋆⋆ 1. (a) Explain how large open circuit voltage gain of an op - amp can be obtained by using cascading of differential amplifier stages. (b) Explain ac analysis of differential amplifier.

[8+8]

2. (a) What is the major difference between the power supply requirements of linear and digital Ics (b) Explain the Pole - Zero and Dominant pole compensation techniques for an op - amp. [6+10] 3. (a) Calculate the exact closed loop gain inverting amplifier shown in figure3 if AOL = 2,00,000, Ri = 2MΩ and R0 = 75Ω. (b) Explain about any two linear and nonlinear applications of op - amp.

[8+8]

Figure 3 4. (a) With suitable circuit diagram explain the operation of an RC phase shift oscillator. (b) It is possible to obtain any shaped waveform as output for a basic oscillator. [12+4] 5. (a) Explain the operation of Quadrature oscillator with neat diagram. (b) Design a notch filter for fo = 8kHz and Q = 10. Choose C= 500pF.

[8+8]

6. (a) Explain the role of the basic building blocks of PLL. (b) Design an op - amp based relaxation oscillator.

[10+6]

7. (a) What are the basic blocks preceding an Analog to Digital converter in a typical application like digital audio recording? 1 of 2

Set No. 3

Code No: R05221002

(b) With the help of a neat circuit diagram and waveforms, explain the operation of a dual slope ADC. What are its special features? [6+10] 8. (a) Draw the circuit diagram of sample and hold circuit and explain its working. (b) Draw the circuit diagram IC 1496 balanced modulator circuit and explain its operations. Sketch the output waveform for the square wave inputs with a phase difference ‘φ’. [8+8] ⋆⋆⋆⋆⋆

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Set No. 4

Code No: R05221002

II B.Tech Supplimentary Examinations, Aug/Sep 2008 LINEAR IC APPLICATIONS (Electronics & Instrumentation Engineering) Time: 3 hours Max Marks: 80 Answer any FIVE Questions All Questions carry equal marks ⋆⋆⋆⋆⋆ 1. (a) Draw the pin diagram and schematic symbol of a typical op - amp IC 741 and explain the function of each pin. (b) Discuss the three basic types of linear IC packages and briefly explain the characteristics of each. (c) State the two types of integrated circuits classified according to their mode of operation and briefly explain the significance of each. [5+5+6] 2. (a) In the circuit of figure 2b, R1 =100ohms, Rf =4.7kΩ , CMRR=90dB. If the amplitude of the induced 60 Hz noise at the output is 5mv (rms), calculate the amplitude of the common ? mode input voltage Vcm . (b) With neat block diagram explain the function of various building blocks of an op - amp. [8+8]

Figure 2b 3. (a) Design a differentiator to differentiate an input signal that varies in frequency from 10 Hz to about 1KHz. If a sine wave of 1V peak at 1000 Hz is applied to this differentiator draw the output waveforms. (b) Why active differentiator circuits are not used in analog computer to solve differential equations. [10+6] 4. (a) Analyze the behavior of an analog phased detector through necessary circuit diagram, waveforms, mathematical expressions and characteristic curves. (b) Design an op - amp based relaxation oscillator and derive the frequency of oscillation. [8+8]

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Set No. 4

Code No: R05221002

5. (a) Define Bessel, Butterworth and Chebysher filters, and compare their frequency response. (b) Sketch the circuit diagram of band elimination filter and design a wide bandreject having fH =200Hz and fL =1KHz. Assume necessary data. [8+8] 6. (a) Draw the circuit of Schmitt trigger using 555 timer and explain its operation. (b) How is an astable multivibrator using 555 timer connected in to a pulse position modulator. [8+8] 7. (a) Sketch and explain the transfer characteristic of a DAC with necessary equations. (b) LSB of a 9 - bit DAC is represented by 19.6mv. If an input of 9 zero bits is represented by 0 volts. i. Find the output of the DAC for an input 10110 1101 and 01101 1011. ii. What is the Full scale reading (FSR) of this DAC? [8+8] 8. (a) Explain different applications of multiplier circuits. (b) What is analog switch? Explain the different analog switches with suitable diagrams. [8+8] ⋆⋆⋆⋆⋆

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