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KLE Society's

KLE Society's KLE Technological University

DEPARTMENT OF SCHOOL OF ELECTRONICS ENGINEERING

FMTH0301/Rev.5.2

Course Plan

Semester: 4 - Semester Year:2016-17

Course Title: Linear Integrated Circuits Course Code: 15EECC205

Total Contact Credits: 50 Duration of SEE: 3 Hours

SEE Marks: 50 CIA Marks: 50

Lesson Plan Author: Nalini C IyerSujataS.Kotabagi R V HangalSujata NJyotiPatilShraddha H

Date: 08-12-2016

Checked By: Dr.Nalini C Iyer Date: 15-12-2016

Course Outcomes (COs):

At the end of the course the student should be able to:

i. Describe the operation of current mirror, differential Amplifier using MOSFET and analyze the respective performance parameters.

ii. Design and analyze the operations of linear applications using Op-amp for the given specifications.

iii. Design and analyze the operations of non-linear applications using Op-amp for the given specification.

iv. Realize the functional block for a given application and specifications using op-amp and linear ICs and verify its functionality using simulator tool.

Powered by www.ioncudos.com of 37.

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Course Articulation Matrix: Mapping of Course Outcomes (COs) with Program Outcomes (POs)

Course Title: Linear Integrated Circuits Semester: 4 - Semester

Course Code: 15EECC205 Year:2016-17

Course Outcomes (COs) / Program Outcomes (POs)

PO1

PO2

PO3

PO4

PO5

PO6

PO7

PO8

PO9

PO10

PO11

PO12

PO13

PO14

PO15

Describe the operation of current mirror, differential Amplifier using MOSFET and analyze the respective performance parameters.

M

Design and analyze the operations of linear applications using Op-amp for the given specifications.

M M

Design and analyze the operations of non-linear applications

M L


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using Op-amp for the given specification.

Realize the functional block for a given application and specifications using op-amp and linear ICs and verify its functionality using simulator tool

M M M M

Degree of compliance L: Low M: Medium H: High


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Competency addressed in the Course and corresponding Performance Indicators

Competency Performance Indicators

PO1.3 - Demonstrate competence in engineering fundamentals

PO1.3.1 - Apply fundamentals of Electrical engineering principles and laws

PO1.4 - Demonstrate competence in electronics and communication engineering knowledge

PO1.4.1 - Apply principles of electronic device

PO1.4.2 - Ability to understand electronic circuits

PO2.1 - Demonstrate an ability to identify and characterize an engineering problem

PO2.1.2 - Identify engineering systems, variables, and parameters to solve the problems

PO2.1.4 - Identify the mathematical, engineering and other relevant knowledge that applies to a given problem

PO5.2 - Demonstrate an ability to select and apply discipline specific tools, techniques and resources

PO5.2.2 - Demonstrate proficiency in using EDA tools

PO9.2 - Demonstrate effective individual and team operations-- communication, problem solving, conflict resolution and leadership skills

PO9.2.1 - Demonstrate effective communication, problem solving, conflict resolution and leadership skills

PO10.1 - Demonstrate an ability to comprehend technical literature and document project work.

PO10.1.2 - Produce clear, well-constructed, and well-supported written engineering documents

PO10.3 - Demonstrate the ability to integrate different modes of communication.

PO10.3.2 - Use a variety of media effectively to convey a message in a document or a presentation

Eg: 1.2.3: Represents Program Outcome ‘1’, Competency ‘2’ and Performance Indicators ‘3’.


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Course Content

Course Code: 15EECC205 Course Title: Linear Integrated Circuits

L-T-P-SS: 4-0-0-0 Credits: 4 Contact Hrs: 50

CIE Marks: 50 SEE Marks: 50 Total Marks: 100

Teaching Hrs: 50 Exam Duration: 3 hrs

Content Hrs

Unit - 1

Chapter No 1. OPAMP characteristics Ideal and non-ideal OPAMP terminal characteristics, Input and output impedance, output Offset voltage, Small signal and Large signal bandwidth.

4 hrs

Chapter No 2. Basic OPAMP architecture Basic differential amplifier, Common mode and difference mode gain, CMRR, 5-pack differential amplifier with design, 7-pack operational amplifier, Slew rate limitation, Instability and Compensation, Bandwidth and frequency response curve.

8 hrs

Chapter No 3. Current Mirrors Current Mirror circuits and Modeling, Figures of merit (output impedance, voltage swing), Widlar, Cascode and Wilson current Mirrors, Current source and current sink.

8 hrs

Unit - 2

Chapter No 4. OPAMP with Feedback OPAMP under Positive and Negative feedback, Impact Negative feedback on Bandwidth, Input and Output impedances, Offset voltage under negative feedback, Follower property & Inversion Property under linear mode operation

8 hrs

Chapter No 5. Linear applications of OPAMP DC and AC Amplifier, Summing, Scaling and Averaging amplifiers (Inverting, Non-inverting and Differential configuration), Integrator, Differentiator,Voltage sources, current sources and current sinks, Active Filters –First and second order Low pass & High pass filters. V to I and I to V converters.

10 hrs

Unit - 3

Chapter No 6 . Nonlinear applications of OPAMP Crossing detectors (ZCD. Comparator), Inverting Schmitt trigger circuits, Monostable&Astable multivibrator, Triangular/rectangular wave generators, Waveform generator, Voltage controlled Oscillator, Precision rectifier, Limiting circuits. Current amplifier, Instrumentation amplifier, Clamping circuits, Peak detectors, sample and hold circuits, Log and antilog amplifiers, Multiplier and divider, Phase shift oscillator, Wein bridge oscillator,

Data Converters:Digital to Analog Converters: Weighted resistor; R -2R, Current steering DAC, settling time

12 hrs


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of DAC.

Analog to Digital Converters: Flash, Dual slope, SAR; resolution, quantization error of ADC.


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Text Book (List of books as mentioned in the approved syllabus)

1. BehzadRazavi, Fundamentals of microelectronics , 2nd edition. 2. Phillip E. Allen, Douglas R. Holberg, CMOS Analog Circuit Design, 3. Ramakant A. Gayakwad, Op - Amps and Linear Integrated Circuits,

References 1. A.S. Sedra& K.C. Smith, Microelectronic Circuits, 2. Sergio Franco, Design with Operational Amplifiers and Analog Integrated Circuits.3. David A. Bell, Operational Amplifiers and Linear Ics.4. B. Razavi, Design of Analog CMOS Integrated CircuitsMcGraw-Hill, 2001

Evaluation Scheme

CIE Scheme

Assessment Weightage in Marks

Minor exam 1 20

Minor exam 2 20

Assignment/Project 10

Total 50

Date: Head of Department


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Course Unitization for Minor Exams and Semester End Examination

Topics / Chapters Teaching hours

No. of Questions in Minor exam 1

No. of Questions in Minor exam 2

No. of Questions

in Assignment

Unit I

OPAMP characteristics 4 0.5 0 0.5

Basic OPAMP architecture 8 1.5 0 1.5

Current Mirrors 8 1 0 1

Unit II

OPAMP with Feedback 8 0 1 1

Linear applications of OPAMP 10 0 2 2

Unit III

Nonlinear applications of OPAMP 12 0 0 2

Note

1. Each Question carries 20 marks and may consists of sub-questions.2. Mixing of sub-questions from different chapters within a unit (only for Unit I and Unit II) is allowed in Minor I, II and SEE. 3. Answer 5 full questions of 20 marks each (two full questions from Unit I, II and one full questions from Unit III) out of 8 questions in SEE.

Date: Head of Department


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Course Code and Title: 15EECC205 / Linear Integrated Circuits

Chapter Number and Title: 1. OPAMP characteristics Planned Hours: 4 hrs

Learning Outcomes:

At the end of the topic the student should be able to:

TLO's CO's BL CA Code

List the characteristics and compare the performance of an ideal and non ideal Op-Amp.

1 2 1.4

Describe the differential and common mode signals. 1 2 1.4

Discuss the importance of output offset voltage, input and output impedances, small signal and large signal bandwidth of ap-amp.

1 2 1.4

Analyse the open loop configurations of Op-Amp for inverting,

Non-inverting and differential amplifier.

1 2 1.4

Lesson Schedule Class No. - Portion covered per hour

1. Ideal and non-ideal OPAMP terminal characteristics

2. Input and output impedance

3. Output Offset voltage.

4. Small signal and Large signal bandwidth.

Review Questions

Sr.No. - Questions TLO BL PI Code

List the ideal characteristics of an OPAMP. Give its symbolical representation and explain the functions of each terminal. Tabulate the ideal Op-amp terminal characteristics.

1 1 1.4.1

Explain the terms input impedance, output impedance, output offset voltage, common mode and difference mode gain.

2 2 1.4.1

List the difference between ideal and non ideal characteristics of OPAMP. 3 2 1.4.1


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Explain the small signal and large signal bandwidth. 3 2 1.4.1

Design the open loop configurations of Op-Amp for differential amplifier with

1) vin1 = 2v and vin3= -3v. 2) vin1 = 3µv and vin3= -4.5µv.

4 2 1.4.1


Chapter Number and Title: 2. Basic OPAMP architecture Planned Hours: 8 hrs

Learning Outcomes:



Describe the working of a basic differential amplifier and Design the differential amplifier for the given specifications.

1 2 2.1

Define common mode gain, difference mode gain and CMRR. 1 2 1.4

Represent the input signals of a differential amplifier in terms of their differential and common mode gain.

1 2 1.4

Describe the architecture of 5-pack and 7-pack differential amplifier.Derive the expression for small signal voltage gain.

1 3 1.4

Analyze the limitations of the slew rate & understand what is instability and compensation

1 2 1.4


1. Basic differential amplifier

2. Common mode and difference mode gain

3. CMRR

4. 5-pack differential amplifier design.


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5. 7-pack operational amplifier

6. Slew rate limitation, Instability Compensation

7. Bandwidth and frequency response curve

8. Revision and Numericals

Review Questions


1. Describe the working principle of a basic differential amplifier , with common mode and differential input voltages.

TLO1 L2 1.4.1

2. Explain small signal operation of the MOS differential pair with differential and common mode gain. Explain CMRR and ICMR.

TLO2 L2 1.4.1

3. For the 5 pack differential amplifier using usingnMOS drive and pMOS loads obtain the expression for small signal differential voltage gain.

TLO4 L2 1.4.1

4. Design the currents and W/L values of the current mirror load differential amplifier to satisfy the following specifications: Vdd= -Vss=2.5V,SR>= 10V/us(Cload=5pf),f-3db>= 100kHz(CL=5pF),a small signal voltage gain of 100 V/V,-1.5<=ICMR<=2V and Pdiss<=1mW. Use model parameters of KN’= 110uA/V2, KP’= 50uA/V2, VTP=-0.7V, VTN=0.7V,λN=0.04V-1 , λP= 0.05V-1.

TLO1 L2 2.1.2

5. Draw the architecture of a two stage operational amplifier and list the different sub circuits in it. Also draw the circuit diagram.

TLO4 L2 1.4.1

6. Why compensation is required? Explain the compensation techniques in an op amp

TLO5 L2 1.4.1

7. For a MOS differential pair with a common mode voltage VCM applied ,let VDD = VSS= 1.5V,kn’(W/L)=4mA/V2,Vt =0.5V ,I=0.4mA and RD =2.5KΩ neglect the channel length modulation. Find VOV and VGS for each MOSFET’s For VCM=-0.2 find vs,iD1,iD2,vD1 and vD2 What is the highest value of vcm for which M1 and M2 remain in saturation.

TLO1 L2 2.1.2


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Chapter-wise Plan

Course Code and Title: 15EECC205/ Linear Integrated Circuits

Chapter Number and Title: 3. Current Mirrors Planned Hours: 8 hrs

Learning Outcomes:



Model and analyze the functionality of the current mirror. 1 2 1.4

Analyze the performance characteristics of the current mirror in terms of figure of merit.

1 2 1.4

Discuss the working principle of a standard cascade, Widlar& Wilson current mirror.

1 2 1.4

Differentiate between current source and current sink. 1 2 1.3

Determine a suitable circuit configuration for current sink,current source, Wilson &Widlar current mirror and find the expression for output impedance.

1 3 2.1


1. Introduction

2. Current Mirror circuits

3. Modeling

4. Figures of merit (output impedance, voltage swing)

5. Widlar, Cascode current Mirrors

6. Wilson current Mirrors

7. Current source and current sink.

8. Revision and Numericals.


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Review Questions


1. Differentiate between current source and current sink? Illustrate with the help of a single MOS transistor.

TLO4 L2 1.4.1

2. Describe the working principle of a standard cascade current sink. Compare its performance with basic current sink.

TLO3 L2 1.4.1

3. Derive the equation of output impedance of a standard cascode current sink.(small signal model approach)

TLO3 L2 1.3.1

4. Explain the working of Wilson and Widlar current mirror with neat diagram TLO3 L2 1.4.1

5. Derive the expression for output impedance of Wilson and Widlar current mirror. TLO5 L2 1.4.1

6. In basic current mirror circuit using two transistor having equal lengths, widths related by W2/W1 = 5, design a current mirror to obtain I= 0.5 mA. , let VDD= -VSS= 5 V, kn’ (W/L) 1 = 0.8 mA / V2, Vt= 1 V, find the value of R.

TLO1 L2 1.4.1

7. Design an NMOS current mirror with VDD= 5 V, VSS= 0 V and Iref = 100 µA. For the matched MOSFETS L= 10 µm, W = 100 µm, Vt = 1 v and Kn’ = 20 µA/ V2.

TLO2 L2 1.4.1

8. Determine a suitable circuit configuration to mirror the current from a reference current of 200ua with high input impedance to drive a differential amplifier with common mode input voltage for the following parameters: R = 2K Ω, Kn2= 10 Kn1= 250 µA/ V2 VDD= 5V.http://www.slideshare.net/mujju433/current-mirrors-very-good-pdf

TLO5 L2 2.1.3

9. Calculate the small signal output resistance for the simple current sink of fig a. a)if Iout =100uA and b) the small signal output resistance if the simple current sink of fig a. is inserted into the cascade current sink configuration of fig a. Assume that W1/L1=W2/L2=1. Use below table for this problem.

TLO5 L3 2.1.3


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UNIT II


Chapter Number and Title:4. OPAMP with Feedback Planned Hours: 8 hrs

Learning Outcomes:



Illustrate the general structure of the feedback amplifier and explain the four basic feedback topologies.

2 2 1.4

Discuss the significance of negative feedback and explain the four basic feedback topologies.

2 2 1.4

Describe the effect of inversion and follower property under linear mode operation and design a suitable signal conditioning circuit for given applications.

2 3 2.1

Compare the characteristics and behavior of an Op-amp under positive and negative feedback.

2 2 1.4


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1. OPAMP under Positive

2. OPAMP under Negative feedback,

3. Impact of Negative feedback on Bandwidth,

4. Input and Output impedances,

5. Offset voltage under negative feedback,

6. Follower property & Inversion Property under linear mode operation

7. Follower property & Inversion Property under linear mode operation

8. Revision and Numericals


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Review Questions


Discuss the effect of negative feedback on the performance characteristics of opamp.

2 2 1.4.1

Draw and explain the generalized feedback structure 1 1 1.4.1

Explain basic feedback topologies with block diagrams. 1 1 1.4.1

Derive the expressions for input and output impedances with respect to voltage series feedback amplifier and voltage shunt feedback amplifier.

1 2 1.4.1

Explain the effect of negative feedback on bandwidth of an OPAMP. 4 2 1.4.1

Explain voltage shunt feedback amplifier and derive the equation for closed loop voltage gain.

3 2 1.4.1

In a non inverting circuit configuration let VI = 1V,R1=2kΩ,and Rf=18KΩ. Find Vo if (a) a=10 V/V,(b)a=.0.1V/V,(c)a=50V/V. Comment on your findings.Vcc= -Vss= 12

2 2 1.4.1

Explain voltage follower circuit in brief. 3 2 1.4.1

A capacitor coupled voltage follower is to be designed to have a lower cutoff frequency of 120Hz. The load resistance is 8.2Kohms and opamp used has a max i/p bias current of 600nA . Design a suitable circuit.

3 3 1.4.1

Explain voltage series feedback amplifier and derive the equation for closed loop voltage gain. Comment on the gain equation.

3 2 1.4.1

Design a suitable amplifier for gain of 100 using Op-amp so that output voltage is proportional to input voltage/ current.

3 3 2.1.2

Design avoltage series feedback amplifier using op-amp for a gain of 100. 1 2 1.4.1

It is required to measure the room temperature of the food processing unit using temperature sensor which provides a voltage in the range of 0-30mv .Design a suitable signal conditioning circuit using Op-Amp to obtain an output voltage in the range of 0-5V, which is proportional to input voltage.

3 3 2.1.2

Discuss the effect of negative feedback on the performance characteristics of opamp.

2 2 1.4.1

Draw and explain the generalized feedback structure 1 1 1.4.1


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Explain basic feedback topologies with block diagrams. 1 1 1.4.1


Chapter Number and Title:5. Linear applications of OPAMP Planned Hours: 10 hrs

Learning Outcomes:



Differentiate between DC and AC amplifiers 2 2 1.4

List and explain the different configurations of OPAMP.Design inverting and non inverting amplifier for the given specifications.

2 2 1.4

Design and explain the working principle of Integrator and Differentiator. 2 2 1.4

Design the instrumentation amplifier to obtain the expression for voltage gain for given specifications.

2 3 2.1

Derive the expression of gain & cutoff frequency for first and second order filter LPF, HPF, and verify the filter response for a given frequency.

2 3 2.1

Discuss the basic principle of oscillator. Design and describe the operation of Phase shift oscillator and Tuned oscillator, Design of RC oscillators.

2 2 1.4


1. DC Amplifiers, AC Amplifiers,

2. Summing, Scaling and Averaging amplifiers (Inverting, Non-inverting and Differential configuration),

3. Integrator,


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4. Differentiator,

5. Voltage sources, current sources and current sinks,

6. Current amplifiers,

7. Instrumentation amplifier,

8. Phase shift oscillator, Tuned Oscillators, Crystal Oscillator,

9. Active Filters –First order Low pass &High pass filters.

10. Active filters- Second order Low pass & High pass filters


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Review Questions


Briefly explain the difference between the DC and AC amplifiers. 1 2 1.4.1

What are the major advantages and disadvantages of a single supply AC amplifier?

1 1 1.4.1

Explain the difference between (a) inverting and differential summing amplifier and (b) inverting and non-inverting averaging amplifier.

2 2 1.4.1

Calculate the voltage gain of an opamp inverting amplifier (fig ) which has R1=680 ohm and R2=39 K. ohm.Also determine the new voltage gain if the resistor positions are reversed.

2 3 1.4.1

A high i/p impedance capacitor coupled non-inverting amplifier is to be designed to have Av=120 and f1=100 Hz. The input signal is 50mV, and the load resistance ranges from 2.7kohm to 27kohm. Design a suitable circuit using a 741 op amp.

2 3 1.4.1

It is required to measure the weight of the vehicle using weigh bridge system, Suggest and explain suitable signal conditioning circuit for measuring the weight interms of voltage.

4 2 1.4.1

Differentiate between integrator and differentiator and give one application of each.

3 2 1.4.1

Explain the different types of controlled sources. 1 2 1.4.1

Describe the operation of inverting integrator and obtain the expression for the transfer function.

2 2 1.4.1

Discuss the operation of op amp as differentiator. 3 2 1.4.1

An integrating circuit as in fig has the following components R1=15Kohm, 3 3 1.4.1


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R2=330Kohm, C1=0.03uf, R3=15Kohm. Determine the output produced

when 400Hz 3V peak to peak square wave is applied as i/p.

In the circuit shown below Rin=50Ω,Ci=0.1µF,R1=100 Ω,Rf=1k Ω and supply voltages=±15V.Determine the bandwidth of the amplifier.

1 3 1.4.1

In the figure, if the CMRR of the operational amplifier is 60 dB, then the magnitude of the output voltage is

2 3 1.4.1

The CMRR of the differential amplifier shown is 2 3 1.4.1


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In the figure, the operational amplifier is ideal and its output can swing between – 15 and + 15 volts.

The input Vi, which is zero for t<0, is switched to 5 volts at the instant t = 0. Given that the output Vo is + 15 volts for t<0, sketch the waveforms of Vo and Vi. You must give the values of important parameters of the sketch.

2 3 1.4.1

T The circuit of figure uses an ideal operational amplifier. For small positive values of Vin, the circuit works as

2 3 1.4.1


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The circuit of figure uses an ideal operational amplifier. For small positive values of Vin, the circuit works as

2 3 1.4.1

Design a non inverting amplifier with a gain of 2.At a maximum output voltage of 10V the current in the voltage divider is to be 10µA.

2 3 1.4.1

An Op-amp having a 106-db gain at dc and a single pole frequency response with ft=2Mhz is used to design a non inverting amplifier with nominal dc gain of 100.Find the 3-db frequency of the closed loop.

5 3 1.4.1

The Guest speaker addressing crowd of 500 audience in an auditorium is subjected to noise from audience and acoustics of the room, Design a suitable selctive circuit to enhance the audibility by eliminating the noise. [Hint : assume maximum voice frequency]

5 3 2.1.2

Explain phase shift oscillator. Design the phase shift oscillator so that f0 = 200Hz.

6 3 1.4.1


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Chapter Number and Title: 6. Nonlinear applications of OPAMP Planned Hours: 12 hrs

Learning Outcomes:



Construct and describe the operation of comparators, Zero crossing detectorsVoltage Controlled Oscillators, triangular and square wave generater, clamping circuits, Peak detectors and sample and hold circuit.

3 2 1.4

Design Inverting Schmitt trigger circuits, astable and mono stable multi-vibrators

3 3 2.1

Explain log and antilog amplifiers. 3 2 1.4

Discuss the Specifications and classifications of ADC and DAC 3 2 1.4

Describe the operation of Successive approximation type ADC. 3 2 1.4

Construct weighted resistor DAC and explain its operation. 3 2 1.4


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1. Crossing detectors (ZCD. Comparator)

2. Inverting Schmitt trigger circuits

3. Monostable & Astable multivibrator

4. Triangular/rectangular wave generators, Waveform generator

5. Voltage controlled Oscillator

6. Precision rectifiers, Limiting circuits, Clamping circuits

7. Peak detectors, sample and hold circuits

8. Phase shift oscillator, Wein bridge oscillator ,Log and antilog amplifiers

9. Multiplier and divider,

10. DAC: Weighted resistor; R -2R, Current steering DAC, settling time of DAC.

11 Flash, Dual slope, SAR;.

12 Resolution, quantization error of ADC


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Review Questions


What is comparator? What is the difference between a basic comparator and the Schmitt trigger?

1 1 1.4.1

List the important characteristics of the comparator? Explain Zero crossing detectors.

1 2 1.4.1

Design a circuit using Op-Amp to obtain the following transfer characteristics with VLTP=-2; VUTP=3; VSAT=15; –VSAT=15. Explain the operation using waveforms and obtain the expressions.

2 3 2.1.2

Explain the operation of Astable multivibrator. How it is used to generate square and triangular waveforms?

2 3 1.4.1

Im Implement a monostable multivibrator using the timer circuit shown in figure. Also determine an expression for ON time ‘T’ of the output pulse.

2 3 2.1.2


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https://www.youtube.com/watch?v=eaM2kglGuJ8

Explain the precision peak detector and precision clamping circuit with neat diagrams.

1 2 1.4.1

Explain log, anti log amplifiers. 3 2 1.4.1

The circuit shown below is an inverse log amplifier. Show that the output vo

is proportional to the inverse logarithm of the input vi

3 2 1.4.2

The analog multiplier shown below has the characteristic vp=v1v2. Determine the output vo for the op amp circuit.

3 2 1.4.2



http://4.bp.blogspot.com/-MHBuFoBPhPA/VHV_XChkuII/AAAAAAAABcY/_lEGs5L4IOI/s1600/26.JPG

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Explain sample and hold circuit. 1 2 1.4.1

For an 8-bit R-2R ladder DAC, the nominal full-scale voltage is 10V. Calculate the analog o/p for i) 10100000 ii) 11101010.

6 3 1.4.2


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Model Question Paper for Minor Exam I

Course Code:15EECC205

Course Title: Linear Integrated Circuits

Duration: 75min

Max. Marks: 40

Note: Answer any two full questions

Q.No

Questions Marks CLO PI Code B L

1aDescribe the working principle of a standard cascode current sink and compare its performance in terms of impedance with simple current sink.

06 1 1.4.1 2

b

Identify the following current mirror configuration and determine the drain current of M4 if all the transistors are in saturation.

07 1 1.4.2 3

c

For two transistor with equal lengths and widths related by W2:W1 = 5,design a basic current mirror to obtain I= 0.5 mA. , let VDD= -VSS= 5 V, kn’ (W/L) 1 = 0.8 mA / V2, Vt= 1 V also determine the appropriate load resistor.[R]

07 1 1.4.2 3

2a

Draw non-inverting and inverting open loop configuration using Op-Amp, determine the output voltage swing for the following inputs:Vin1=2µVVin2=.5VVin3=.-3.5µVGiven that VCC= -VSS=12V

06 1 1.4.1 2

b

In the differential amplifier circuit given below the width of M2 is twice as that of M1. Find the expression for small signal gain of the amplifier if the input voltages Vin1 and Vin2 are equal..

07 1 2.1.2

3


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cWhy compensation is required? Explain the compensation techniques in an op-amp.

07 1 1.4.1 2

3a

For the differential amplifier configuration given below, with (W/L)1,2=25/0.5, µnCox=50µA/V2, VTH=0.6V, λ=γ=0 and VDD =3V

a. What is the required input CM for which RSS sustains 0.5V?

b. Calculate RD for a differential gain of 5

06 1 2.1.2 3

b List the ideal characteristics of an OPAMP. Give its symbolical representation and explain the functions of each terminal. Tabulate the ideal op-amp terminal characteristics.

07 1 1.4.1 2

c

For the differential amplifier with the current mirror as a load ,determine the (W/L) and drain current of all MOSFET’s for the following specifications: Vdd=-Vss=2.5V,SR>=10V/us(Cload=5pf),f-3db>= 100kHz(CL=5pF),a small signal voltage gain of 100,-1.5<=ICMR<=2V and Pdiss<=1mW. Model parameters : KN’= 110uA/V2, KP’= 50uA/V2, VTP=-0.7V, VTN=0.7V, λN=0.04V-1 , λP= 0.05V-1.

07 1 1.4.2 2


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Model Question Paper for Minor Exam II

Course Code: 15EECC202 Course Title: Linear Integrated Circuits

Duration: 75min

Max. Marks: 40

Note: Answer any two full questions

Q.No Questions Marks CLOPI

CodeB L

1a

Compute the CMRR of the differential amplifier given below 06 2 1.4.2 2

b

It is required to measure the room temperature of the tissue culture laboratory in order to maintain the constant temperature of the room for the better growth of the tissues which is measured using the RTD .Design a signal conditioning circuit to generate a voltage proportional to measured temperature. [Sensitivity of RTD is 10mV/°c]

07 2 2.1.2 3

c

For the following Op-Amp configuration, with three inputs V1,V2 and V3 , compute the value of feedback resistor R to obtain vout=100V.

Given V1=1V,V2=-3V and V3= -5V

07 2 1.4.2 3


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2a

Two different pre-amp microphones are used in a recording studio, one for vocals and other for the musical instrument with output voltage in the range of 0-2V and 0-0.5V respectively. Design a suitable circuit using Op-Amp to combine signals from both the microphones in such a way that the signal corresponding to the musical instrument should be twice amplification as that of vocal signal.

06 2 2.1.2 3

b

For the circuit shown below with the values of R1=10KΩ, Rf=100 KΩ, Cf=1nF.Find1.Lower frequency limit of integration and 2. Response for the step, square and sine inputs.

07 2 1.4.2 2

c For the non inverting amplifier shown below with Rin=50Ω, Ci= C1=0.1µF, R1=R2=R3=100k Ω, Rf=1M Ω and VCC=+15V.Determine a) bandwidth of the amplifier

b) maximum output voltage swing.

07 2 1.4.1 3


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3a

Compute output voltage Vout for the circuit shown below Amplifier with Buffer Circuit.

06 2 1.4.1 2

b

Calculate voltage drops and currents in this circuit by identifying proper current direction and polarity for voltage .Also calculate the overall voltage gain of this amplifier in terms of ratio and as a figure in units of decibels.

07 2 1.4.2 2

c

Draw the circuit configuration of an instrumentation amplifier with high input impedance. Using circuit analysis techniques arrive at an expression for the output voltage in terms of input voltage and resistances.

07 2 1.4.1 2


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Model Question Paper for Semester End Examination

Course Code:15EECC205 Course Title: Linear Integrated Circuits

Duration: 3 hrs

Max. Marks: 100

Note: Answer five questions; any two full questions from each unit-I and unit-II and one full

Question from unit-III. Assume missing data if any

Unit-I

Q.No Questions Marks

CLO

PI Cod

e

B L

GA

1aDifferentiate between a current source and current sink? Illustrate with the help of a single MOS transistor.

06 1 1.4.1 2 1

b

Determine a suitable circuit configuration to mirror the current from a reference current of 200ua with high input impedance to drive a differential amplifier with common mode input voltage for the following parameters: R = 2K Ω, Kn2= 10 Kn1= 250 µA/ V2 VDD= 5V.

07 1 2.1.2 3 2

c

For a MOS differential pair with a common mode voltage VCM

applied, let VDD = VSS= 1.5V, kn’ (W/L)=4mA/V2, Vt =0.5V ,I=0.4mA and RD =2.5KΩ neglect the channel length modulation.1. Find VOV and VGS for each MOSFET’s2. For VCM=-0.2 find vs,iD1,iD2,vD1 and vD2

What is the highest value of vcm for which M1 and M2 remain in saturation?

07 1 2.1.3 3 2

2aDesign an NMOS current mirror with VDD= 5 V, VSS= 0 V and Iref = 100 µA. for the matched MOSFETS L= 10 µm, W = 100 µm, Vt = 1 v and Kn’ = 20 µA/ V2.

08 1 1.4.1 3 1


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bDraw the circuti configuration of a two stage operational amplifier and explain the different sub circuits in it.

06 1 1.4.1 2 1

cWhat is ground interference? Discuss the effect of resistance mismatch on CMRR

06 1 1.4.1 2 1

3a

Design the currents and W/L values of the current mirror load differential amplifier to satisfy the following specifications: Vdd= -Vss=2.5V,SR>= 10V/us(Cload=5pf),f-3db>= 100kHz(CL=5pF),a small signal voltage gain of 100 V/V,-1.5<=ICMR<=2V and Pdiss<=1mW. Use model parameters of KN’= 110uA/V2, KP’= 50uA/V2, VTP=-0.7V, VTN=0.7V,λN=0.04V-1 , λP= 0.05V-1.

08 1 2.1.3 3 2

b List the ideal characteristics of an OPAMP. Explain the terms input impedance, output impedance, output offset voltage.

06 1 1.4.1 2 1

c

Unit II

4a

It is required to measure the room temperature of the food processing unit in order to maintain the constant temperature using LM35. Design a circuit that to measure the temperature of the food processing unit in order to generate a voltage proportional to change in measured temperature.[Change in voltage for per degree rise in temperature is 3mV.

06 2

2.1.2 3

1

b

It is required to use the microwave system in Microfabrication unit for processes such as plasma processes (surface modification, chemical vapor infiltration, powder processing), chemical synthesis and processing, and waste remediation. Design the circuit for operating the microwave system in the range of 5 MHz to 50 GHz frequency with 20 db / decade roll off rate. Assume the parameters required to design the given application.

05 2

1.3.1 1

1

c

In an anolog communication system using frequency modulation, it is required to provide preemphasis for the input signal above 2200 Hz before transmission. Design a suitable selective circuit to provide the required

07 2

2.1.3 3

2

5aDifferentiate between inverting and differential summing amplifier.

06 2 1.3.1 2 1

bDescribe inverting integrator and obtain the expression for the transfer function.

07 2 1.3.1 2 1

c A sensor provides a signal voltage between -30mV and +75mV

a) If an inverting amplifier is used with avoltage gain of voutv¿

=1000 and ±15V dc supplies, what is the expected

07 2 2.1.3 3 2


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output voltage range?b) If a non-inverting amplifier is used with ±15V dc supplies,

what is the maximum resistance ratio RfR1

that can be used

without the op amp saturating?

6aIt is required to measure the weight of the vehicle using weigh bridge system, Suggest and explain suitable signal conditioning circuit for measuring the weight interms of voltage.

06 2 1.3.1 2 1

b

A sinusoidal signal is riding on a 2V dc offset ie. the average value of the total sinusoidal signal is 2V. Design a circuit to remove the dc offset, and amplify the sinusoidal signal without phase reversal by a factor of 100.

07 2

2.1.3 3

2

cDesign a voltage shunt feedback amplifier using op-amp for gain of 50.

07 2 1.4.1 2 1

Unit III

7a

Formulate a circuit using Op-Amp to produce the following hysteresis. Explain the operation using waveforms and obtain the expressions. VLTP=-2; VUTP=3; VSAT=15; –VSAT=-15.

10

3

2.1.2 3

1

bDraw tha circuit configuration to generate triangular wave, describe the circuit operation using waveforms.

10 3 1.4.1 2 1

8aIm Implement a monostable multivibrator using the timer circuit shown in figure. Also determine an expression for ON time ‘T’ of the output pulse.

10 3 1.4.1 2 1


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bDescribe the sample and hold circuit. 10 3 1.4.1 2 1



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