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Note for Basic Electronics - BE by JAYAPRASAD KM

  • Basic Electronics - BE
  • Note
  • Visvesvaraya Technological University - VTU
  • Electronics and Communication Engineering
  • B.Tech
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Jayaprasad Km
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OPERATION AMPLIFIER AND 15EC64 APPLICATIONS BASIC ELECTRONICS [BE] 18ELN14/24 OPERATION AMPLIFIER AND APPLICATIONS MODULE 3 NOTES REFERENCE TEXT BOOK: 1. D.P. Kothari, I. J.Nagrath, “Basic Electronics”, 2nd Ed. Chapter (6.2) 2. Thomas L.Floyd, “Electronic Devices”, Pearson Education, 9th Ed, 2012. Chapter (12.1, 12.2) PREPARED BY: Prof. JAYAPRASAD K M; EMAIL: jayaprasadkm@gmail.com E L COMPUTER ECTRON COMMUNICATION I C S A N D CNETWORKS O M M U N I C A T I O N D E P A R TPage M E 1N T

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BASIC ELECTRONICS MODULE 3 NOTES 18ELN14/24 CONTENTS OPERATIONAL AMPLIFIER (Op-Amp) 1.1 OP-AMP PARAMETERS 3 3 3 4 4 5 5 6 6 COMMON MODE REJECTION RATIO [CMRR] OPEN LOOP VOLTAGE GAIN ( Aol ) MAXIMUM OUTPUT VOLTAGE SWING (Vo(p-p)) INPUT OFFSET VOLTAGE INPUT BIAS CURRENT (IBIAS) INPUT IMPEDANCE (ZIN) INPUT OFFSET CURRENT (IOS) OUTPUT IMPEDANCE (ZOUT) SLEW RATE FREQUENCY RESPONSE NOISE SPECIFICATION POWER SUPPLY REJECTION RATIO (PSRR) VIRTUAL GROUND EXERCISE PROBLEMS 6 7 7 7 7 8 8 8 9 9 9 10 10 10 APPLICATION OF OP-AMP 11 11 12 13 14 INTRODUCTION 1.1.1 1.1.2 1.1.3 1.1.4 1.2 OP-AMP SYMBOL THE IDEAL OP-AMP THE PRACTICAL OP-AMP INTERNAL BLOCK DIAGRAM OF OP-AMP OP-AMP INPUT MODES 1.2.1 1.2.2 1.3 1.3.1 1.3.2 1.3.3 1.3.4 1.3.5 1.3.6 1.3.7 1.3.8 1.3.9 1.3.10 1.3.11 1.3.12 1.3.13 1.3.14 1.4 1.4.1 1.4.2 1.4.3 1.4.4 DIFFERENTIAL MODE COMMON MODE INVERTING AMPLIFIER NON-INVERTING AMPLIFIER VOLTAGE FOLLOWER ADDER ( SUMMER) Prepared by: Prof. Jayaprasad K M, EC DEPT, CEC Page 1

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BASIC ELECTRONICS 1.4.5 1.4.6 1.4.7 1.5 MODULE 3 NOTES 18ELN14/24 INTEGRATOR DIFFERENTIATOR COMPARATOR 15 16 17 18 25 PROBLEMS QUESTION BANK 1.6 SYLLABUS Operational Amplifier(Text-2): Introduction, Op-Amp input Modes. Op-Amp Parameters, Input Offset voltage and current, Input Bias Current, Input and Output Impedance, Slew Rate. Operational Amplifier Application (Text-1): Inverting and Non Inverting Amplifier, Summer, Voltage Follower, Integrator, Differentiator, Comparator. TEXT BOOK: BOOK TITLE/AUTHORS/PUBLICATION TEXT-1 D.P. Kothari, I. J. Nagrath, “Basic Electronics”, 2nd Ed., McGraw Hill Education (India) Private Limited, 2018. TEXT-2 Thomas L. Floyd, “ Electronic Devices”, Pearson Education, 9th edition 2012. Prepared by: Prof. Jayaprasad K M, EC DEPT, CEC Page 2

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MODULE 3 NOTES 18ELN14/24 BASIC ELECTRONICS OPERATIONAL AMPLIFIER (Op-Amp)  Usually these dc voltage terminals are left off the schematic symbol for simplicity but are understood to be there. 1.1 INTRODUCTION  Early operational amplifiers (op-amps) were used primarily to perform mathematical operations such as addition, subtraction, integration, and differentiation—thus the term operational.  These early devices were constructed with vacuum tubes and worked with high voltages.  Today’s op-amps are linear integrated circuits (ICs) that use relatively low dc supply voltages and are reliable and inexpensive. 1.1.2 THE IDEAL OP-AMP  The ideal op-amp has  Infinite voltage gain ( ie AV = ∞)  Infinite input impedance (Ri = ∞) 1.1.1 OP-AMP SYMBOL  Zero output impedance(Ro = 0)  The standard operational amplifier (op-amp) symbol is shown  Infinite Bandwidth (B.W. = ∞ )  Infinite Common mode rejection ratio (ie CMRR = ∞)  Infinite slew rate (ie S = ∞)  Zero power supply rejection ratio ( PSRR = 0) i.e output in Figure (a).  It has two input terminals, the inverting (-) input and the noninverting (+) input, and one output terminal.  Most op-amps operate with two dc supply voltages, one positive and the other negative, as shown in Figure (b), although some have a single dc supply. Prepared by: Prof. Jayaprasad K M, EC DEPT, CEC voltage is zero when power supply VCC = 0  Zero offset voltage(i.e when the input voltages are zero, the output voltage will also be zero) Page 3

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