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Fifth Semester B.E. Degree Examination, June/July 2Ol4

Linear lGts and Applications

Time: 3 hrs. Max. Marks:100Note: l. Answer FIVE full questions, selecting

at least TWO questions from each part.2. Data sheets of typical standard resistors,

capacitors and op-amps sre permitted.3. For all the design problems, circuit is must

und the missing data maybe suitably assumed.

PART - Aa. Draw the circuit to show how a capacitor coupled non-inverting amplifier should be

connected to use a single polarity supply. Briefly explain with waveforms. (08 Marks)b. Sketch and develop the eqr.ration for "input impedance" in high input impedance capacitor

coupled voltage follower and also show the design equations. (06 Marks)c. A capacitor coupled difference amplifier is to have two input voltages which each range

liom 200 mV to 2V. The lowest signal frequency is 300 Hz, the load resistance is 3.3 kf)and the voltage gain is to be 5. Design a suitable circuit using 741 op-amp. (06 Marks)

2 a. Discuss operational amplifier circuit stability and show how feedback in inverting amplifiercan produce instability. (08 Marks)

b. Sketch the circuit of a phase lag llequency compensation network and explain its operationto stabilize the op-amp ciicuit. (06 Marks)

USN

c.

3a.

List the precautions that should be observed fbr operational amplifier circuit stability.(06 Marks)

With control and output voltage waveforms, briefly explain the operation of sample and holdcircuit. (06 Marks)

b. With a neat block diagram, explain the operation of successive approximation analog todigital converter. (08 Marks)

c. Design a precision full-wave rectifier consisting of a half wave rectifier and a summer toproduce a 2V peak output from a sine wave input with a peak value of 0.5 V and a frequencyof I MHz. Use bipolar op-amp with a supply of +15V. (06 Marks)

4 a. Using 741 op-amp with +18V supply, design an inverting Schmitt trigger to haveUTP : 1.5 V and LTP : -3V. (05 Ntarks)

b. An op-amp Astable multivibrator is to have 3 kHz output with an amplitude of +11V. UsingBIFET op-amp design a suitable circuit. Also calculate the minimum op-amp slew raterequired for the circuit. (05 Marks)

c. Explain the operation of monostable multivibrator with circuit diagram and relevantwaveforms. Also show the complete design equations.

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(10 Marks)

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10E856

PART - B5 a. State Barkhousen criteria and explain how it is fulfilled in R.C. phase shift oscillator. Alsoexplain how output amplitude can be stabilized using diodes. (10 Marks)

b. Using bipolar op-amps with +12V supply, design a triangular/rectangular waveformgenerator. The triangular wave is to have an output amplitude of t2V. The frequency is to beadjustable from I kHz to 6 kHz and duty cycle range is to be 40o/o to 600/o. Determinesuitable component values. (10 Marks)

6 Explain the operation of frst order active high pass filter with its frequency r"tnonfii Marks)

b. Deygng second order active low pass filter using 741 op-amp to have a cut-off frequency of1 kHz. Draw the frequency response. (06 Marks)

c. What is a band pass filter? Sketch the circuit of a single stage band pass filter. Explain thelow pass and high pass operation of circuit. Discuss the design. (08 Marks)

7 a. Briefly explain the operation of switched capacitor filters. What are its advantages?(08 Marks)(08 Marks)(04 Marks)

8 a. Explain the operation of voltage follower regulator. (06 Marks)b. Design an adjustable voltage regulator to produce an output voltage of 12 V with a

maximum load current of 50 mA. Assrirne a peak ripple voltage of lV in the supply voltage.

(For the Zener diode used. Take Iz = 200 mA) (06 Marks)

c. What are the features of 723 N.,'C. regulator? Explain positive voltage regulator using 723 ICwith its pin diagram '. , (08 Marks)

b. Explain the block diagram'of phase locked loops.c. What is a power booster? Wby it is needed?

*16d<{<{<

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