I= REALIZATION AND STUDY OF CURRENT-MODE FILTERS AND OSCILLATORS FOR INTEGRATED CIRCUIT IMPLEMENTATION
Pakistan Research Repository Home
 

Title of Thesis
REALIZATION AND STUDY OF CURRENT-MODE FILTERS AND OSCILLATORS FOR INTEGRATED CIRCUIT IMPLEMENTATION

Author(s)
Abdul Qadir
Institute/University/Department Details
Department of Electrical Engineering/ NED University of Engineering and Technology Karachi
Session
2003
Subject
Electrical Engineering
Number of Pages
310
Keywords (Extracted from title, table of contents and abstract of thesis)
Active filter, quadrature oscillator, current-mode circuit, operational amplifier, operational transconductance amplifier, current feedback amplifier, current conveyor, four terminal floating nullor, active only filter, negative capacitor, sensitivity

Abstract
This thesis presents the theory and the development of seventeen current mode novel circuits through mathematical analysis and testing using simulation techniques (based on a well known software of global fame known as PSpice). The entire work is confined to the circuits of filters and oscillators in current mode, which is the trend not only of today but also of tomorrow. Out of seventeen circuits, thirteen are filter circuits and four are oscillator circuits. The work leads to the development of new and improved filter and oscillator circuits for use in instrumentation, communication and in other areas of analogue signal processing. The circuits were designed with an aim to implement these on integrated circuits in CMOS technology.

Download Full Thesis
2599.25 KB
S. No. Chapter Title of the Chapters Page Size (KB)
1 0 Contents
108.79 KB
2 1 Introduction 1
192.82 KB
  1.1 General 1
  1.2 Area Of Work 2
  1.3 Historical Review Of Continuous Time Filters 2
  1.4 Motivation 7
  1.5 Main Objectives 12
  1.6 Organization Of Thesis 14
  1.7 References 17
3 2 Active Devices Used 21
274.87 KB
  2.1 Operational Transconductance Amplifier 21
  2.2 Advantage 22
  2.3 Limitations 23
  2.4 Salient Features Of Ots 24
  2.5 Circuit Description Of Ota 25
  2.6 Effect Of Temperature On Gm 32
  2.7 Additional Features Of Ota 33
  2.8 Ota Biasing Techniques 36
  2.9 Active Rc Synthesis 36
  2.10 Electronic Tunability 39
  2.11 Temperature Compensation Of Otas 39
  2.12 Biquad Circuits 40
  2.13 Non Idealities Of Ota 41
  2.14 Operational Amplifiers 46
  2.15 Current Feedback Amplifiers 50
  2.16 Summary 52
  2.17 References 54
4 3 Current Mode Systems 56
306.99 KB
  3.1 Current Mode Approach 56
  3.2 Import Impact Of Current Mode 64
  3.3 Current Mode Amplifiers 68
  3.4 Review Of Traditional Current Output Circuits Using Votage Operational Amplifier Designs 73
  3.5 Oa Supply Current Sensing 74
  3.6 Current Conveyors 78
  3.7 Application Of Simulated Inductor To A Filter 95
  3.8 Converting Rc Active Circuits To Current Conveyors Equivalent Circuits 95
  3.9 Summary 96
  3.10 References 100
5 4 Current Mode Filters Using Single Output Otas 104
485.73 KB
  4.1 Introduction 104
  4.2 Design Of Continuous Time Filters Using Otas 105
  4.3 Ota Based Bandpass And Highpass Filters 107
  4.4 Calculation Of Pole Frequency 113
  4.5 Simulation Results 114
  4.6 Change Of Driving Point 115
  4.7 Low Pass Response 121
  4.8 Rlc Resonator 124
  4.9 Ota Based Rlc Resonator 133
  4.10 Current Ota-C Universal Biquad Using Single Output Otas , Grounded Capacitors And Single Input 143
  4.11 Conclusions 147
  4.12 References 149
6 5 Circuits Based On Multiple Output Otas And Oas Including Active Only 152
570.18 KB
  5.1 Introduction 152
  5.2 Multiple Output Otas 152
  5.3 Why Multiple Output Otas ? 152
  5.4 Filter Circuits With Multiple Output Otas 158
  5.5 Current Mode Universal Ota-C Canonic Biquad Filter 164
  5.6 Simulation Results 173
  5.7 Single Input Ota-C Biquad With Minimum Components 174
  5.8 Oa Based Filters 185
  5.9 Oa Based Active Only Filter Topology 188
  5.10 Mixed Mode Active Only Circuit Topology 190
  5.11 Conclusions 201
  5.12 References 203
7 6 Current Feedback Amplifier Based Filters 206
443.72 KB
  6.1 Introduction 206
  6.2 Current Feedback Operational Amplifiers 206
  6.3 Cfa Features And Analysis 210
  6.4 Cfa Based Filters 217
  6.5 Cfa Based Filters With Negative Impedance 218
  6.6 Ftfn Based Filters 223
  6.7 Analysis Considering Non Idealities 237
  6.8 Single Ftfn Filter 239
  6.9 Conclusions 248
  6.10 References 250
8 7 Current Mode Oscillators 253
404.54 KB
  7.1 Introduction 253
  7.2 Significance Of Oscillator 253
  7.3 Simple Rc -Type Oscillators 256
  7.4 Current Mode Ota-C Based Oscillators 258
  7.5 Effect Of Temperature On Oscillations 266
  7.6 Ftfn Based Oscillators 266
  7.7 Cfa Based Oscillator 276
  7.8 Conclusions 284
  7.9 References 287
9 8 Conclusions 291
90.33 KB
10 9 Appendix 302-310
90.47 KB