OXFORD ENGINEERING COLLEGE
(NAAC Accredited With ‘B’ Grade)
Department of ECE
List of Questions
YEAR/SEM: II/IV STAFF NAME: R.RADHALAKSHMI
SUB CODE: EC6404 SUB NAME: LINEAR INTEGRATED CIRCUITS
UNIT-I
BASICS OF OPERATIONAL AMPLIFIERS
PART-A
1. What are the advantages of an IC over discrete components?(Apr-2014)(Apr-2013,Nov-2014)
2. State an Monolitihic ICs.(Apr-2010,Nov-2014)
3. Define input offset current.
4. Define input offset voltage.
5. What are the applications of current source?
6. What is a current mirror & why is it called so?(Apr-2010)
7. What is a current mirror with magnification?(Nov-2011)
8. What is voltage reference circuit?
9. Explain the concept of virtual ground.
10. What is an operational amplifer?
11. Define CMRR. (Apr-2013,Nov-2010,Apr-2011)
12. What are the requirements to be met for a good current source?(May-2012)
13. What are the advantages of Wilson and wildar current sources?(May-2012)
14. Define PSRR.
15. What are the ideal characteristics of op-amp?
16. Draw the equivalent circuit of practical op-amp?
17. Discuss the nature of output in open loop configuration of op-amp?
18. Draw the block diagram of Operational Amplifier.
19. Define unity gain bandwidth of an opamp.
20. Find the maximum frequency for an op-amp with sinewave o/p voltage of 10V peak and
Slewrate is 2V/µs.
21. Define thermal drift.
22. What is the need for frequency compensation?(Nov-2010)
23. Define slew rate. (Apr-2014,Nov-2010,Nov-2011)
24.A differential amplifer has a differential voltage gain of 2000 & a common mode gain of 0.2
Find CMRR in dB.( Nov-2010)
25.Compare the performance of inverting and non inverting operational amplifier
Configurations(Nov-2010)
PART-B
1. With simple schematic of differential amplifer,explain the function of differential amplifer?
2. (i)Explain in detail about the constant current source circuit?
(ii)Explain in detail about the constant current mirror circuit? (Nov 2012)
3. Explain the operation of a Wilson& Widlar current source with a neat diagram.(Nov-2011,Apr-2011)
4. Explain the Internal circuit diagram of IC 741 (Apr-2010)
5. Explain slew rate.What is fill power bandwidth?and also explain the methods to improve slew
rate? .(Nov-2012,Apr-2011,Apr-2010).
6.Explain in detail about the open loop and closed loop gain configurations in op-amp? (May-2017)
PART C
1. Discuss its AC and DC performance characteristics.(Nov-2011, May-2012, Nov 2014, May-2017)
UNIT-II
APPLICATIONS OF OPERATIONAL AMPLIFIERS
PART – A
(First Half)
1. Mention the two linear and two non-linear applications performed by an operational amplifer?
2. What is a sign changer? (Apr-2014)
3. What is unity follower?
4. Draw the schematic diagram of voltage follower?
5. Give the advantages of voltage follower?
6. Draw the circuit diagram of I-V converter?(Apr-2010)
7. Difference between V-I converter &I-V converter?(Apr-2013)
8. What is transconductance amplifer?
9. What is need of for instrumentation amplifier?
10. State the requirements of instrumentation amplifier. (Apr-2013,Apr-2011)
11. State limitations of integrator?
12. List the applications of integrator circuit?
13.Draw the circuit of practical integrator & differentiator.
(Second Half)
14. What is antilog amplifier?
15. Why temperature compensation is required for the log amplifier?
16. What is a zero crossing detector?
17. What is a comparator and give applications of comparator?(May-2012,Nov-2012)
18. What is hysteresis?
19. What is the most important application of a Schmitt trigger circuit?
20. What do you mean by a precision rectifier? Differentiate with conventional rectifier(Nov 2012,
Apr-2011)
21. Draw the circuit diagram of Peak Detector. (Apr-2014)
22.Define clipper &classification of clipper?
23.What is meant by clamper?
24.What is meant by low pass filter and high pass filter?
25.Give the applications of clamper?
PART B
(First Half)
1. Explain the detail about V-I converter and I-V converter .(Nov-2010,May-2012))
2. Explain the working of an instrumentation amplifier. Mention the specific advantages of
three op-amp instrumentation amplifier circuit. (Apr-2013,Nov-2011,Nov-2014,May-2017)
3. Draw and explain an ideal active op-amp Diffentiator & Integrator circuit.(Apr-2010, May-2017)
(Second Half)
4. With a neat diagram, explain the operation of Schmitt trigger.(Nov-2010,May-2012,Nov-2011)
5. Explain the detail about clipper and clamper circuits?
6. Explain the low pass butterworth filter? (Nov-2010,Nov-2011,May-2011))
PART C
1. With neat diagram, explain logarithmic amplifier and antilogarithmic
amplifier.(Apr-2014,Nov-2012,May-2011)
UNIT-III
ANALOG MULTIPLIER AND PLL
PART-A
1. State the principle of working of analog multiplier?&List the parameters of multiplier?
2. What is 2-Quadrant Multiplier?(Nov-2012)
3. Mention the applications of analog multiplier.
4. State the various techniques used for multiplier? (May-2017)
5. State the advantages of transconductance technique.(Nov-2011)
6. What are the advantages of emitter coupled transistor pair.(Apr-2011).
7. What is a gilbert cell&give the applications of gilbert cell?
8. Define PLL?
9. Draw a basic block diagram of PLL.
10. Define VCO.
11. Why VCO is called as V-F converter. (May-2012)
12. Define V-F conversion factor Kv(Apr-2011)
13. Give the applications of VCO.
14. Define lock range and capture range of PLL. (May-2017)
15. What is Pull in time.?
16. What is frequency synthesizer?
17. What is companding?
18. Define modulation index.
19. What is the function of phase detector in a PLL? (May-2017)
20. Mention the applications of PLL.
21. Draw the circuit of AM detector using PLL.
22. Give the relation between lock range and capture range of PLL.
23. What is the need for frequency synthesizer? (Apr-2014)
24. List the features of IC 566 VCO.
25. State why phase detector o/p in a PLL should be followed by a low pass filter?
PART-B
1. Explain in the detail about variable transconductance amplifer? (Apr-2013,Nov-2012,May-2017))
2. Explain the applications of analog multiplier(Apr-2011)
i)Squaring
(ii)Square rooting
(iii)Frequency doubler
(iv)Phase angle detector
3.Draw the block diagram and connection diagram of IC 566 VCO and explain. Obtain an expression
for frequency of oscillation.(Nov-2010,Apr-2010,May-2017)
4.Explain the functional block diagram of PLL IC565.
5. Calculate free running frequency ,lock range &capture range in IC565 PLL in following various
parameters are R1=10KΩ;C1=0.01µF&C2=10 µF if supply voltages are changes as follows 10V to -10V.
6. (i) A PLL has a free running frequency of 400KHZ and the bandwidth of the low pass filter is 8KHZ.
Will the loop tend to acquire lock for an input signal of 550KHZ? In this case,assume that the
phase detector produes sum and difference frequency components? (May-2017)
(ii)Explain the basic operation of PLL?
PART –C
1. Explain the applications of IC 565 PLL. (Apr-2014,Apr-2011, May-2017))
UNIT-IV
ANALOG TO DIGITAL AND DIGITAL TO ANALOG CONVERTERS
PART-A
1. What is the function of DAC and ADC?
2. Classify DACs.
3. Classify ADCs.
4. Name the essential parts of a DAC.
5. Why is an inverted R-2R ladder network DAC better than R-2R ladder DAC?
6. Which is the fastest ADC and why?(Nov-2011)
7. Draw the symbol of n bit D/A converter.
8. Define resolution of a DAC.(Nov-2011,Nov-2014))
9. Discuss the disadvantages of integrating type ADC.(Apr-2010)
10. Draw the symbol for an n-bit A/D converter.
11. Write down the drawback of weighted D/A converter.
12. Draw the transfer characteristics of an ideal 4 bit A/D converter and explain.
13. Define Accuracy of DAC converters.(Apr-2011)
14. What are the specifications of D/A converter.
15. What is a sample/hold circuit? (Apr-2014,Nov-2014)
16. Give two advantages of SA type ADC.
17. Mention any two specifications of a D/A converter. (Apr-2013)
18. For an n-bit flash type A/D converter, how many comparators are required? State the disadvantage of that
type of converter(Apr-2013)
19. Compare and contrast binary ladder and R-2R ladder DAC?(Nov-2010)
20. Define conversion time of DAC.(Nov-2010,Apr-2010)
21. what output would be produced by a D/A converter whose output is 0 to 10V and whose input binary is 0110
for a 4bit DAC. .(Nov-2012)
22.What is the drawback of Dual slope ADC?(Nov-2012,May-2012)
23. Define Settling time of DAC.(May-2012)
24. Define over sampling of A/D converter.
25. Define Voltage to time conversion.
PART-B
1. With a neat sketch, explain Flash type ADC(Nov-2011).
2. With a neat block diagram, explain oversampling ADC(Nov-2012,Apr-2011) .
3. Draw the block diagram and explain the working of Voltage to Time Converter. (Apr-2013)
4. Explain weighted resistor type and R-2R ladder type DAC. (Apr-2014,Nov-2012,May-2012, May-2017)
5. With a neat sketch, explain successive approximation ADC.(Nov-2012,Apr-2011,Apr-2010,May-2017)
6. Explain the high speed and hold circuits? (Apr-2014,May-2012)
PART C
1.Explain the details about types of ADC .
UNIT-V
WAVEFORM GENERATORS AND SPECIAL FUNCTION ICS
PART-A
1. List the types of multivibrators?
2. Give the formula for period of oscillations in an op-amp astable circuit. (Apr-2013)
3. State the advantages and disadvantages of RC phase shift oscillator?
4. Draw the neat circuit diagram of weinbridge oscillator using op-amp.
5. What is meant by monostable multivibrator circuit?
6. Sketch the basic circuit and write limitation of a 723 IC regulator.(Nov-2012)
7. What is meant by astable multivibrator circuit?What are the three terminals of a fixed voltage regulator
and an adjustable voltage regulator?
8. Which are the basic elements of IC555 timer?
9. Draw the block diagram of IC 555 timer.
10. List two application each in which the 555 Timer can be used as a astable and monostable multivibrator?
11. What is voltage regulator?
12. List the various voltage regulator characteristics.
13. Define load regulation.
14. Define line regulation.
15. Define ripple rejection in voltage regulators?
16. Define ripple rejection in voltage regulators?
17. Define duty cycle of a periodic pulse waveform. (Apr-2013)
18. What is switching regulator?
19. Define SMPS&State the applications of SMPS.
20. What are the limitations of 3 terminal IC regulators?
21. What is a switched capacitor filter and its advantages?(May-2012,Nov-2011)
22. State the expressions for dutycycle and the frequency of oscillations for astable circuit using IC555.
23. Define VFC and FVC.
24. What is isolation amplifier?
25. What is an optocouplers?state types of opto coupler. (Apr-2014,Apr-2011)
PART-B
1.Draw and explain the operation of astable multivibrator using opamp and derive an expression
for its frequency of oscillation.(Nov-2014)
2.With neat sketches of circuit diagram and waveforms, explain the operation of 555 Timer wired as a
monostable multivibrator. (May-2017)
3. Draw and explain the circuit of Schmitt trigger using 555 timers
4. Explain in detail about the three terminal fixed voltage regulators?
5. Explain in detail about thevoltage to frequency converters(VFC) and frequency to voltage
converters(FVC).
6. Explain in detail about the audio power amplifier and video amplifier?(May-2017)
PART-C
1. With a neat diagram, explain IC723 general purpose regulator. (Apr-2014,May-2012)
