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[ pdf ] Novel Signal Conditioning Circuits for Push-Pull Type Transducers

Novel Signal Conditioning Circuits for Push-Pull Type Transducers Download
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Topic under  Signal Conditioners
Source: www.measurements.iitm.ac.in 
File size: 965 KB
File type: pdf
Last download on: Sat Mar 25, 2017 02:53:05 PM
Short Desciption:
In this thesis, novel signal conditioning circuits suitable for push-pull type of resistive and capacitive transducers are discussed and their performance analysed. With suitable alterations, these circuits are transformed into direct resistance / capacitance to digital converters. A relaxation oscillator based signal conditioning circuit suitable for push-pull type of resistive transducers is initially presented. The duty cycle of the oscillator output is directly related to the changes in the transducer resistances. Since the average value of the output of the oscillator is linear with respect to the duty cycle, the circuit provides a highly linear characteristic even for transducers having an inverse relationship with the physical input.

Summary:
TABLE OF CONTENTS Page Acknowledgement i Abstract ii List of Tables v List of Figures vi 1. Introduction 1 1.1 Transducers and their characteristics, 1 1.2 Signal Conditioning circuits and their properties, 3 1.3 Scope of the present work, 4 2. Signal Conditioning Circuit for Push-pull Type 6 Resistive Transducers 2.1 Push-pull type transducers, 6 2.2 Circuit description and operation, 12 2.3 Error analysis, 14 2.3.1 Inaccuracy due to the finite, unequal switching resistances, 16 2.3.2 Effect of the difference in switching voltage levels, 17 2.3.3 Effect of offset voltages, 17 2.3.4 Influence of the delay in switching, 18 2.4 Experimental verification, 20 3. Signal Conditioning Circuit for Push-pull Type 28 Capacitive Transducers 3.1 Capacitive transducers, 28 3.2 Circuit description and operation, 31 3.3 Error analysis, 33 3.3.1 Inaccuracy due to the finite, unequal switching resistances, 34 3.3.2 Effect of the finite difference in switching levels, 36 3.3.3 Effect of the offset voltages, 38 3.3.4 Influence of the delay in switching, 38 3.3.5 Effect of stray capacitances, 39 3.4 Experimental verification, 40 6 Measurements Laboratory IIT Madras --------------------------------------- 7 4. Direct Digital Converter 46 4.1 Digital interface, 46 4.2 The proposed direct digital converter for a push-pull type resistive transducer, 48 4.3 Error analysis, 51 4.3.1 Frequency drift of the PLL, 51 4.3.2 Errors in the counters, 52 4.4 Experimental verification, 52 5. Conclusions 56 5.1 Summary of the work reported in the thesis, 56 5.2 Scope for future work, 57 6. References 58 Appendix A 61 Appendix B 64 Appendix C 69 Appendix D 70 Appendix E 71 Curriculum - Vitae 72 7 Measurements Laboratory IIT Madras --------------------------------------- 8 LIST OF TABLES Table 2.1 Performance of prototype circuit (resistive) 24 Table 3.1 Performance of prototype circuit (capacitive) 42 Table Performance of the prototype direct digital converter 55 8
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