郭斯彥臺灣大學：電子工程學研究所杜明哲Du, Ming-JheMing-JheDu2007-11-272018-07-102007-11-272018-07-102006http://ntur.lib.ntu.edu.tw//handle/246246/57698A one-chip integrated circuit of a 2-W class-D audio power amplifier with very high efficiency using a CMOS technology is presented. Compared with traditional class-AB amplifiers that are very poor at efficiency, most below 50%, the proposed class-D amplifier has the efficiency of 90% at the smaller distortion level. The class-D amplifiers generate pulse-width-modulated (PWM) signals by comparing a triangle-wave with input-signals. An output stage with zero dead time and high efficiency is applied to improve the linearity and reduce wasted battery energy. An approach to reducing distortion is applied by using feedback calibration.Contents Acknowledgement…………………………………………………………….. i Abstract………………………………………………………………………. ii Contents……………………………………………………………………… iii Figure Captions………………………………………………………………. v Table Captions………………………………………………………………viii Chapter 1 Introduction Chapter 2 Principle and Design of the Class-D Audio Power Amplifier 2.1 Structure of the Class-D Amplifier 3 2.2 Principle of the pulse 5 2.3 Advance Issues of Class-D Amplifier 8 2.3.1 Design and Distortion of the Output Stage 8 2.3.2 Power Efficiency 13 2.4 Previous Work of the Class-D Amplifier 18 2.4.1 A Class-D Amplifier Using A Spectrum Shaping Technique 18 2.4.2 A 700mW Class-D Design with Direct Battery Hookup in a 90nm Process 19 2.4.3 An Integrated 200W Class-D Audio Amplifier 22 Chapter 3 The Proposed Circuit of The Class-D Audio Power Amplifier 3.1 The Proposed Circuit of The Class-D Audio Power Amplifier and Simulation Result 26 3.2 Structure of the Proposed Class-D Amplifier 28 3.3 Implementation of the Block Diagram 29 3.2.1 Triangle Waveform Generator 29 3.2.2 The PWM Comparator 30 3.2.3 The Integrator of the Input Stage 31 3.2.4 The Nonoverlapping Driving Circuit 32 3.2.5 The Low-pass Filter 33 3.3 Simulation Result for Proposed Circuit 34 3.3.1 Relationship of fin and the Total Harmonic Distortion 34 3.3.1 Power Efficiency 34 Chapter 4 Conclusion 5.1 Conclusions 36 5.2 Future Work 37 Reference 38823062 bytesapplication/pdfen-USD類音訊CMOSClass DAudiothesishttp://ntur.lib.ntu.edu.tw/bitstream/246246/57698/1/ntu-95-R92943076-1.pdf