EC2254 Linear Integrated Circuits B.E Model Question Paper : aalimec.ac.in
Name of the College : Aalim Muhammed Salegh College of Engineering
University : Anna University
Department : Electronics and Communication Engineering
Subject Code/Name : EC2254 – Linear Integrated Circuits
Degree : B.E
Year : II
Document Type : Model Question Paper
Website : aalimec.ac.in
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AALIMEC Linear Integrated Circuits Model Question Paper
Part A (10 X 2 = 20 Marks) :
May 2010
1. What is an integrated circuit?
2. What is current mirror?
3. Give the schematic of op-arnp based current to voltage converter.
Related : Aalim Muhammed Salegh College of Engineering EC2253 Electromagnetic Fields B.E Model Question Paper : www.pdfquestion.in/1609.html
4. Draw the circuit diagram of differentiator and give its output equation.
5. What is a VCO?
6. Draw the relation between the capture ranges and lock range in a PLL.
7. Define resolution of a data converter.
8. Give the advantages of integrating type ADC.
9. Draw the internal circuit for audio power amplifier.
10. What are the three different wave forms generated by ICL8038?
Part B – (5 X 16 = 80 Marks) :
11. (a) (i) Define CMRR. Draw the circuit of an Op-arnp differential amplifier and give the expression for CMRR. (8)
(ii) Define Slew Rate. Explain the cause of slew rate and derive an expression for Slew rate for an op-arnp voltage follower. (8)
Or
(b) Briefly explain the various processes involved in fabricating monolithic IC which integrates bipolar transistor, diode, capacitor and resistor. (16)
12. (a) (i) Design a first order Low-pass filter for cut-off frequency of 2 KHz and pass-band gain of 2. (8)
(ii) Explain a positive clipper circuit using an Op-amp and a diode with neat diagrams. (8)
Or
(b) (i) Design a circuit to implement Va =O.545V3 +O.273V4 -1.25Vj -2V2. (8)
(ii) Draw and explain a simple Op-amp differentiator. Mention its limitations. Explain with a neat diagram how it can be overcome in a practical differentiator. Design an Op-arnp differentiator that will differentiate an input signal with maximum frequencyfmax =100Hz . (8)
13. (a) (i) With a neat diagram explain the variable transconductance technique in analog multiplier and give its output equation. (8)
(ii) Briefly explain the working of voltage controlled oscillator. (8)
Or
(b) What are important building block of phase locked loop ( PLL) explain its Working? (16)
14. (a) (i) Explain the working of R-2R ladder DAC. (8)
(ii) Explain the working of success approximation ADC. (8)
Or
(b) (i) A dual slope ABC uses a 16-bit counter and a 4 MHz clock rate. The maximum input voltage is +10V. The maximum integrator output voltage should be -8V when the counter has recycled through2n counts. The capacitor used in the integrator is O.l,uF . Find the value ofresistor R of the integrator. (8)
(ii) vVhat is a sample and hold circuit? Briefly explain its construction and application. (8)
15. (a) (i) How is voltage regulators classified? Explain a series voltage regulator. (8)
(ii) What is an optocoupler? Briefly explain its characteristics. (8)
Or
(b) With a neat circuit diagram and internal functional diagram explain the working of 555 timers in astable mode. (16)
December 2010
Ec 2254 – Linear Integrated Circuits
Time: Three Hours
Maximum: 100 Marks
Answer All Questions
PART A – (10 x 2 = 20 Marks)
1. Define slew rate and CMRR.
2. Why are active loads preferred than passive loads in the input stage of an operational amplifier?
3. Compare the performance of inverting and non inverting operational amplifier configurations.
4. Why is frequency compensation required in operational amplifier?
5. Draw and write equation of an integrator using an op-amp.
6. What is lock range and capture range of PLL?
7. Compare and contrast binary ladder and R-2R ladder DAC?
8. Define resolution and conversion time of DAC.
9. Sketch the monostable multivibrator circuit diagram using 1C555.
10. What is meant by thermal shutdown applied to voltage regulators?
PART B : (5 x 16 = 80 Marks)
11. (a) (i) Explain the term epitaxy and describe the epitaxial growth process.
(ii) Describe in detail the processing steps involved in the fabrication of monolithic IC.
Or
(b) Draw the circuit diagram of the output stage of the IC 741 OP AMP and explain its operation with clearly indicating the protection mechanisms indicated.
12. (a) With relevant circuits, explain the following applications of OPAMP
(i) Voltage to current converters
(ii) Multiplier
Or
(b) (i) Explain the steps involved in the design of a band pass filter using OPAMP.
(ii) Write a note on Schmitt trigger.
13. (a) Draw the functional block schematic of a NE565 PLL and explain. the roles of the low pass filter and VCO. Derive the expression for the capture range and lock in range of the PLL.
Or
(b) With suitable block diagram, explain the operation of 566 voltage controlled oscillator. Also derive an expression for the frequency of the output waveform generated.
14.
(a) Describe the operation of dual slope and successive approximation type ADC. What are the advantages of dual slope ADC?
Or
(b) (i) Explain voltage mode and current mode operations of R-2R ladder type DAC.
(ii) Discuss the operation of sample and hold circuit with circuit diagram.
15. (a) (i) How can the current drive capability be increased while using three terminal voltage regulators?
(ii) Design an adjustable voltage regulator circuit using LM317 for the following specifications:
Input dc voltage = 13.5 V
Output DC voltage = 5 to 9 V
Load current (maximum) =1 A
Or
(b) Describe the working of IC723 voltage regulator and explain the importance of current limiting techniques.