Semester Examination, Dec.20l4l Jan.20l5 Linear lGts and Applications … · 2015-06-14 · l0EE56...
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10E856 USN Fifth Semester B.E. Degree Examination, Dec.20l4l Jan.20l5 Linear lGts and Applications Time: 3 hrs. Max. Marks:100 Note: 7. Answer any FIVE fall questions, selecting atlesst TWO questions from each part. 2. (Jse of resistor and capacitor stsndsrd vslues list are permitted. a. ci o o d ! o. cd E (.) o 3e -o boj .5 i.r d$ gd' ol -O o> ?.a o;; oa) boa 'o Z' 4) o-- e= o.l 2* (ea !O o; >i !F o:i F> =o 5r U< a C'.1 o z c d ir- C! PART _ A I a. Sketch the circuit of a capacitor - coupled high Zinnon- inverting ampliher, explain design and the circuit operation. Obtain the equation for input impedance of the circuit. (08 Marks) b' With a neat circuit diagrarn, explain the design and operation of a capacitor coupled inverting amplifier,using a single polarity supply. (06 Marks) c' Design a capacitor coupled voltage follower using d 741 op-amp. The lower cutoff frequency for the circuit is to be 120 Hz, and load resistance is 8.2kQ. (06 Marks) a. Explain phase lead and phase lag compensation methods and show how it affects operational amplifier frequency response. (08 Marks) b. Consider a74l op-amp with slew rate of 0.6 V/ps is used as a voltage follower. Calculate : i) The slew rate limited cut off frequency if the sine wave output is 6V ii) Calculate the maximum peak value of the sinusoidal output voltage, if the circuit operate with unity gain cut-off frequency of 800 KHz iii) Calculate the maximurn peak value of the output voltage, if the upper cut-off frequency is 8 KHz. (06 Marks) c. List the precautions that should be observed for operational amplifier circuit stability. (06 Marks) 3 a. Show how a dead zone circuit can be combined with a summer circuit to produce precision clipping on the positive half - cycle of the output waveform. Draw the waveforms, explain its operation and design procedure. (08 Marks) b. Design a voltage follower peak detector circuit using BIFET op-amp. The pulse tlpe signal voltage has a peak value of 2.5 V with a rise time of 5ps and the output voltage is to be held at 2.5 V for a time of 100 ps. The maximum output error is to be approximately lo/o. Calculate the required component values and specify the output current and slew rate of the operational amplifiers. (06 Marks) c. With a neat diagram, explain the operation of successive - approximation tlpe of A/D converter. (06 Marks) b. Draw an op-amp inverting Schmitt trigger circuit, explain its operation and design steps sketch typical input output characteristics. (08 Marks) Sketch the circuit of an astable multivibrator. Show the voltage waveform and explain its operation. (06 Marks) Explain the effects of output voltage swing, input voltage range, slew rate and frequency compensation upon op-amp switching circuits. (06 Marks) I of2 c. www.bookspar.com | VTU NOTES | QUESTION PAPERS | NEWS | VTU RESULTS | FORUM | VTU BOOKSPAR APP www.bookspar.com | VTU NOTES | QUESTION PAPERS | NEWS | VTU RESULTS | FORUM | VTU BOOKSPAR APP
Transcript of Semester Examination, Dec.20l4l Jan.20l5 Linear lGts and Applications … · 2015-06-14 · l0EE56...
10E856USN
Fifth Semester B.E. Degree Examination, Dec.20l4l Jan.20l5Linear lGts and Applications
Time: 3 hrs. Max. Marks:100Note: 7. Answer any FIVE fall questions, selecting
atlesst TWO questions from each part.2. (Jse of resistor and capacitor stsndsrd vslues list are permitted.
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PART _ A
I a. Sketch the circuit of a capacitor - coupled high Zinnon- inverting ampliher, explain designand the circuit operation. Obtain the equation for input impedance of the circuit. (08 Marks)
b' With a neat circuit diagrarn, explain the design and operation of a capacitor coupledinverting amplifier,using a single polarity supply. (06 Marks)
c' Design a capacitor coupled voltage follower using d 741 op-amp. The lower cutofffrequency for the circuit is to be 120 Hz, and load resistance is 8.2kQ. (06 Marks)
a. Explain phase lead and phase lag compensation methods and show how it affects operationalamplifier frequency response. (08 Marks)
b. Consider a74l op-amp with slew rate of 0.6 V/ps is used as a voltage follower. Calculate :
i) The slew rate limited cut off frequency if the sine wave output is 6Vii) Calculate the maximum peak value of the sinusoidal output voltage, if the circuit operate
with unity gain cut-off frequency of 800 KHziii) Calculate the maximurn peak value of the output voltage, if the upper cut-off frequency
is 8 KHz. (06 Marks)c. List the precautions that should be observed for operational amplifier circuit stability.
(06 Marks)
3 a. Show how a dead zone circuit can be combined with a summer circuit to produce precisionclipping on the positive half - cycle of the output waveform. Draw the waveforms, explainits operation and design procedure. (08 Marks)
b. Design a voltage follower peak detector circuit using BIFET op-amp. The pulse tlpe signal
voltage has a peak value of 2.5 V with a rise time of 5ps and the output voltage is to be held
at 2.5 V for a time of 100 ps. The maximum output error is to be approximately lo/o.
Calculate the required component values and specify the output current and slew rate of theoperational amplifiers. (06 Marks)
c. With a neat diagram, explain the operation of successive - approximation tlpe of A/Dconverter. (06 Marks)
b.
Draw an op-amp inverting Schmitt trigger circuit, explain its operation and design steps
sketch typical input output characteristics. (08 Marks)Sketch the circuit of an astable multivibrator. Show the voltage waveform and explain itsoperation. (06 Marks)Explain the effects of output voltage swing, input voltage range, slew rate and frequencycompensation upon op-amp switching circuits. (06 Marks)
I of2
c.
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PART _ B
S a. Design a triangularkectangular signal generator to have 5V peak to peak triangular output, afrequency ranging from 200 Hzto 2KHz and a duty cycle adjustable from 20oh to 80%. Use
a bipolar op-amp with a supply of +15V. (08 Marks)
b. With a neat circuit diagram and waveform, explain the operation of Wein bridge oscillator.(06 Marks)
c. Draw the circuit of a phase shift oscillator. Sketch the output and feedback voltage
waveforms and explain the circuit operation. (06 Marks)
6 a. Sketch the gain - frequency response for low pass, high pass, band pass and band stop filters
and explain the function of each type of filter. (08 Marks)
b. With a neat circuit diagram, explain the operation and design of a second-order low pass
filter. (06 Marks)
Using a 74I op-amp,'design a narow-band bandpass filter. The center frequency is to be
lKHz and the passband is to be approximately t33 Hz on each side of 1 KHz. (06 Marks)
Show how a switched - capacitor can be used to simulate a resistor and discuss the
advantages of this process in IC applications. (06 Marks)
What are the functions of FLT ' U2 specialized IC filter and list the important
characteristics of the IC. : (06 Marks)
Explain the operation of PLL with a block dragram. List the applications of PLL. (08 Marks)
Mention the salient features of 123 regulators. Show how a 723 regular can be used as a
positive voltage regulator and explain the circuit operation. (06 Marks)
Sketch the circuit of a voltage follower regulator. Explain its operation, design procedure
and equation for line regulation, load regulation and ripple relecjiolt, (10 Marks)
Sketch a regular that uses a LM340 IC voltage regulator. Briefly discuss the LM340 and itsperformance. (04 Marks)
7a.
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