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ebook - electronics High Efficiency Audio Power Amplifier
1 Introduction ..........1
1.1 Motivation .............................1
1.2 Problem definition.........................................2
1.2.1 Audio Signals ...........................2
1.2.2 Amplifier Power..........................2
1.2.3 Efficiency or dissipation?............3
1.2.4 Distortion ...........................4
1.2.5 Integration on chip ....................6
1.2.6 Other specifications..........................6
1.3 Efficiency of the class AB amplifier ................7
1.4 Scope and Outline ................10
2 Measuring and predicting amplifier dissipation................13
2.1 Introduction ............................13
2.2 How to measure?...........13
2.3 Characteristics of audio signals...............14
2.3.1 The test set..................14
2.3.2 Amplitude distribution .....15
2.3.3 Frequency distribution............17
2.4 The IEC-268 test signal.............18
2.4.1 Characteristics ..........19
2.4.2 Completeness ...........20
2.4.3 Accuracy.......................21
2.5 A simple periodic test signal .......23
2.6 An IEC variant....................25
2.7 Conclusions ...........26
3 Linear and switching amplifiers.....27
3.1 Introduction ......27
3.2 Linear amplifiers .....27
3.2.1 Class G ........27
3.2.2 Class H ...29
3.2.3 ‘Cool power’ .........30
3.2.4 ‘Front/Rear’......31
3.2.5 GeneralISAtion and modelling ..... 32
3.2.6 Limitations of linear amplifiers ........... 35
3.3 Switching amplifiers .......... 36
3.3.1 The class D principle ....... 36
3.3.2 Output stage ............ 37
3.3.3 Output stage dissipation........ 40
3.3.4 Output filter................ 41
3.3.5 Modulators and feedback........... 43
3.3.6 Limitations of switching amplifiers . 49
3.4 Conclusions............... 49
4 Combinations of linear and switching amplifiers ............. 51
4.1 Introduction............ 51
4.2 Amplifiers in series ........... 51
4.2.1 Amplifiers with a tracking power supply............ 51
4.2.2 Chip area considerations................... 54
4.2.3 Bridge topology............................... 57
4.3 Amplifiers in parallel ................. 58
4.3.1 Problems with amplifiers in parallel.......... 58
4.3.2 Current dumping ........................... 59
4.3.3 Reduction of AB’s output current............ 60
4.4 Conclusions............................... 61
5 RealISAtion of a class AB/D bridge amplifier............ 63
5.1 Introduction.... 63
5.2 Circuit principle ..................... 63
5.3 Circuit analysis and design considerations ................ 64
5.3.1 Timing of bridge switching............ 64
5.3.2 Dissipation ......................... 67
5.3.3 Common mode rejection.............. 68
5.4 Implementation of a prototype ......... 70
5.4.1 RealISAtion ........................... 70
5.4.2 Measurements ............... 71
5.4.3 Discussion................. 74
5.5 Conclusions......................... 74
6 RealISAtion of a class AB/D parallel amplifier............ 75
6.1 Introduction............... 75
6.2 Circuit principle ............ 75
6.3 Circuit analysis and design considerations ....................... 77
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