Preface |
|
xvii | |
Acknowledgments |
|
xx | |
Part 1 Audio Power Amplifier Basics |
|
|
|
3 | (12) |
|
1.1 Organization of the Book |
|
|
3 | (1) |
|
1.2 The Role of the Power Amplifier |
|
|
4 | (1) |
|
1.3 Basic Performance Specifications |
|
|
5 | (2) |
|
1.4 Additional Performance Specifications |
|
|
7 | (3) |
|
1.5 Output Voltage and Current |
|
|
10 | (1) |
|
1.6 Basic Amplifier Topology |
|
|
11 | (3) |
|
|
14 | (1) |
|
|
15 | (43) |
|
|
15 | (10) |
|
|
25 | (1) |
|
|
26 | (2) |
|
2.4 Basic Amplifier Stages |
|
|
28 | (9) |
|
|
37 | (2) |
|
2.6 Current Sources and Voltage References |
|
|
39 | (4) |
|
2.7 Complementary Feedback Pair (CFP) |
|
|
43 | (1) |
|
|
44 | (1) |
|
2.9 Operational Amplifiers |
|
|
45 | (1) |
|
2.10 Amplifier Design Analysis |
|
|
45 | (13) |
|
3 Power Amplifier Design Evolution |
|
|
58 | (28) |
|
|
58 | (1) |
|
3.2 The Basic Power Amplifier |
|
|
58 | (2) |
|
3.3 Adding Input Stage Degeneration |
|
|
60 | (5) |
|
3.4 Adding a Darlington VAS |
|
|
65 | (3) |
|
3.5 Input Stage Current Mirror Load |
|
|
68 | (3) |
|
|
71 | (3) |
|
|
74 | (2) |
|
3.8 Paralleling Output Transistors |
|
|
76 | (2) |
|
3.9 Higher-Power Amplifiers |
|
|
78 | (1) |
|
3.10 Crossover Distortion |
|
|
79 | (3) |
|
|
82 | (1) |
|
3.12 Completing an Amplifier |
|
|
82 | (3) |
|
|
85 | (1) |
|
|
86 | (32) |
|
|
86 | (1) |
|
4.2 The Front-End: IPS, VAS and Pre-Drivers |
|
|
87 | (4) |
|
4.3 Output Stage: Drivers and Outputs |
|
|
91 | (3) |
|
4.4 Heat Sink and Thermal Management |
|
|
94 | (1) |
|
|
95 | (6) |
|
|
101 | (1) |
|
|
102 | (1) |
|
4.8 Building the Amplifier |
|
|
103 | (1) |
|
4.9 Testing the Amplifier |
|
|
104 | (6) |
|
|
110 | (1) |
|
|
111 | (4) |
|
|
115 | (1) |
|
|
116 | (2) |
|
|
118 | (28) |
|
5.1 Signal-to-Noise Ratio |
|
|
118 | (2) |
|
5.2 A-Weighted Noise Specifications |
|
|
120 | (1) |
|
5.3 Noise Power and Noise Voltage |
|
|
120 | (1) |
|
|
121 | (1) |
|
5.5 Noise Voltage Density and Spectrum |
|
|
122 | (1) |
|
5.6 Relating Input Noise Density to Signal-to-Noise Ratio |
|
|
123 | (1) |
|
5.7 Amplifier Noise Sources |
|
|
124 | (3) |
|
|
127 | (1) |
|
|
128 | (1) |
|
5.10 Bipolar Transistor Noise |
|
|
128 | (2) |
|
|
130 | (5) |
|
|
135 | (1) |
|
|
136 | (2) |
|
5.14 Amplifier Circuit Noise |
|
|
138 | (5) |
|
5.15 Excess Resistor Noise |
|
|
143 | (1) |
|
|
144 | (2) |
|
6 Negative Feedback Compensation and Slew Rate |
|
|
146 | (17) |
|
6.1 How Negative Feedback Works |
|
|
146 | (1) |
|
6.2 Input-Referred Feedback Analysis |
|
|
147 | (1) |
|
6.3 Feedback Compensation and Stability |
|
|
148 | (3) |
|
6.4 Feedback Compensation Principles |
|
|
151 | (3) |
|
|
154 | (2) |
|
|
156 | (3) |
|
6.7 Compensation Loop Stability |
|
|
159 | (1) |
|
|
160 | (3) |
|
7 Amplifier Classes, Output Stages and Efficiency |
|
|
163 | (19) |
|
7.1 Class A, AB and B Operation |
|
|
163 | (1) |
|
7.2 The Complementary Emitter Follower Output Stage |
|
|
164 | (5) |
|
7.3 Output Stage Efficiency |
|
|
169 | (2) |
|
7.4 Complementary Feedback Pair Output Stages |
|
|
171 | (3) |
|
7.5 Stacked Output Stages |
|
|
174 | (2) |
|
|
176 | (4) |
|
|
180 | (2) |
|
8 Summary of Amplifier Design Considerations |
|
|
182 | (7) |
|
|
182 | (1) |
|
8.2 Sizing the Power Supply |
|
|
183 | (1) |
|
8.3 Sizing the Output Stage |
|
|
184 | (1) |
|
|
185 | (1) |
|
8.5 Protecting the Amplifier and Loudspeaker |
|
|
186 | (1) |
|
8.6 Power and Ground Distribution |
|
|
187 | (1) |
|
|
187 | (2) |
Part 2 Advanced Power Amplifier Design Techniques |
|
189 | (192) |
|
|
191 | (26) |
|
|
191 | (4) |
|
|
195 | (4) |
|
9.3 Buffered Input Stages |
|
|
199 | (1) |
|
|
200 | (1) |
|
9.5 Complementary IPS and Push-Pull VAS |
|
|
200 | (7) |
|
9.6 Unipolar Input Stage and Push-Pull VAS |
|
|
207 | (2) |
|
9.7 Input Common-Mode Distortion |
|
|
209 | (1) |
|
|
210 | (1) |
|
|
211 | (1) |
|
9.10 Current Feedback Amplifiers |
|
|
212 | (2) |
|
|
214 | (3) |
|
|
217 | (16) |
|
10.1 Origins and Consequences of DC Offset |
|
|
218 | (4) |
|
|
222 | (4) |
|
10.3 The Servo Is in the Signal Path |
|
|
226 | (3) |
|
10.4 DC Offset Detection and Protection |
|
|
229 | (1) |
|
|
230 | (1) |
|
10.6 Eliminating the Input Coupling Capacitor |
|
|
231 | (1) |
|
10.7 DC Servo Design Issues and Nuances |
|
|
231 | (2) |
|
11 Advanced Forms of Feedback Compensation |
|
|
233 | (26) |
|
11.1 Understanding Stability Issues |
|
|
233 | (1) |
|
|
234 | (6) |
|
11.3 Miller Input Compensation |
|
|
240 | (1) |
|
11.4 Two-Pole Compensation |
|
|
241 | (7) |
|
11.5 Transitional Miller Compensation |
|
|
248 | (7) |
|
11.6 A Vertical MOSFET TMC Amplifier Example |
|
|
255 | (3) |
|
|
258 | (1) |
|
12 Output Stage Design and Crossover Distortion |
|
|
259 | (31) |
|
12.1 The Class AB Output Stage |
|
|
259 | (1) |
|
12.2 Static Crossover Distortion |
|
|
260 | (2) |
|
12.3 Optimum Bias and Bias Stability |
|
|
262 | (3) |
|
12.4 Output Stage Driver Circuits |
|
|
265 | (4) |
|
12.5 Output Transistor Matching Considerations |
|
|
269 | (2) |
|
12.6 Dynamic Crossover Distortion |
|
|
271 | (5) |
|
12.7 The Output Emitter Resistors |
|
|
276 | (1) |
|
|
277 | (3) |
|
12.9 Output Stage Frequency Response and Stability |
|
|
280 | (5) |
|
12.10 Sizing the Output Stage |
|
|
285 | (1) |
|
12.11 Delivering High Current |
|
|
285 | (2) |
|
12.12 Driving Paralleled Output Stages |
|
|
287 | (1) |
|
12.13 Advanced Output Transistors |
|
|
288 | (2) |
|
|
290 | (29) |
|
13.1 VAS Output Impedance and Stability |
|
|
290 | (3) |
|
13.2 Complementary Feedback Pair (CFP) |
|
|
293 | (3) |
|
13.3 CFP Output Stages with Gain |
|
|
296 | (2) |
|
13.4 Bryston Output Stage |
|
|
298 | (1) |
|
13.5 ThermalTrak™ Output Stage |
|
|
299 | (1) |
|
13.6 Class A Output Stage |
|
|
299 | (1) |
|
13.7 Crossover Displacement (Class XD™) Output Stage |
|
|
300 | (3) |
|
13.8 DoubleCross™ Output Stage |
|
|
303 | (7) |
|
13.9 Sliding Bias and Non-Switching Output Stages |
|
|
310 | (3) |
|
13.10 LT1166 Output Stage |
|
|
313 | (4) |
|
13.11 Measuring Output Stage Distortion |
|
|
317 | (1) |
|
|
317 | (2) |
|
14 MOSFET Power Amplifiers |
|
|
319 | (31) |
|
14.1 MOSFET Types and Characteristics |
|
|
320 | (2) |
|
14.2 MOSFET Advantages and Disadvantages |
|
|
322 | (6) |
|
14.3 Lateral Versus Vertical Power MOSFETs |
|
|
328 | (1) |
|
14.4 Parasitic Oscillations |
|
|
328 | (3) |
|
14.5 Biasing Power MOSFETs |
|
|
331 | (4) |
|
14.6 Crossover Distortion |
|
|
335 | (3) |
|
14.7 Driving Power MOSFETs |
|
|
338 | (6) |
|
14.8 Paralleling and Matching MOSFETs |
|
|
344 | (1) |
|
14.9 Simulating MOSFET Power Amplifiers |
|
|
345 | (1) |
|
14.10 A Lateral MOSFET Power Amplifier Design |
|
|
346 | (3) |
|
14.11 A Vertical MOSFET Power Amplifier Design |
|
|
349 | (1) |
|
|
350 | (17) |
|
15.1 Feed-Forward Error Correction |
|
|
350 | (1) |
|
15.2 Hawksford Error Correction |
|
|
351 | (2) |
|
15.3 Error Correction for MOSFET Output Stages |
|
|
353 | (2) |
|
15.4 Stability and Compensation |
|
|
355 | (3) |
|
15.5 Performance and Design Issues |
|
|
358 | (3) |
|
15.6 Circuit Refinements and Nuances |
|
|
361 | (3) |
|
15.7 A MOSFET Power Amplifier with Error Correction |
|
|
364 | (3) |
|
16 Other Sources of Distortion |
|
|
367 | (14) |
|
16.1 Distortion Mechanisms |
|
|
367 | (1) |
|
16.2 Early Effect Distortion |
|
|
367 | (1) |
|
16.3 Junction Capacitance Distortion |
|
|
368 | (1) |
|
16.4 Grounding Distortion |
|
|
368 | (1) |
|
16.5 Power Rail Distortion |
|
|
369 | (1) |
|
16.6 Input Common-Mode Distortion |
|
|
370 | (1) |
|
|
370 | (2) |
|
16.8 Capacitor Distortion |
|
|
372 | (1) |
|
16.9 Inductor and Magnetic Distortions |
|
|
373 | (1) |
|
16.10 Magnetic Induction Distortion |
|
|
374 | (1) |
|
16.11 Fuse, Relay and Connector Distortion |
|
|
375 | (4) |
|
16.12 Load-Induced Distortion |
|
|
379 | (1) |
|
16.13 EMI-Induced Distortion |
|
|
379 | (1) |
|
16.14 Thermally Induced Distortion (Memory Distortion) |
|
|
379 | (2) |
Part 3 Real-World Design Considerations |
|
381 | (154) |
|
17 Output Stage Thermal Design and Stability |
|
|
383 | (38) |
|
17.1 Power Dissipation Versus Power and Load |
|
|
383 | (1) |
|
17.2 Thermal Design Concepts and Thermal Models |
|
|
384 | (7) |
|
17.3 Transistor Power Ratings |
|
|
391 | (1) |
|
17.4 Sizing the Heat Sink |
|
|
392 | (3) |
|
17.5 The Bias Spreader and Temperature Compensation |
|
|
395 | (9) |
|
17.6 Thermal Bias Stability |
|
|
404 | (4) |
|
17.7 Thermal Lag Distortion |
|
|
408 | (1) |
|
17.8 ThermalTrak™ Power Transistors |
|
|
409 | (9) |
|
17.9 A ThermalTrak™ Power Amplifier |
|
|
418 | (3) |
|
18 Safe Area and Short-Circuit Protection |
|
|
421 | (26) |
|
18.1 Power Transistor Safe Operating Area |
|
|
421 | (3) |
|
18.2 Output Stage Safe Operating Area |
|
|
424 | (4) |
|
18.3 Short-Circuit Protection |
|
|
428 | (6) |
|
18.4 Safe-Area-Limiting Circuits |
|
|
434 | (5) |
|
18.5 Testing Safe-Area-Limiting Circuits |
|
|
439 | (1) |
|
18.6 Protection Circuits for MOSFETs |
|
|
440 | (1) |
|
18.7 Protecting the Driver Transistors |
|
|
440 | (1) |
|
18.8 Loudspeaker Protection Circuits |
|
|
440 | (7) |
|
19 Power Supplies and Grounding |
|
|
447 | (19) |
|
19.1 The Design of the Power Supply |
|
|
447 | (3) |
|
19.2 Sizing the Transformer |
|
|
450 | (2) |
|
19.3 Sizing the Rectifier |
|
|
452 | (1) |
|
19.4 Sizing the Reservoir Capacitors |
|
|
452 | (3) |
|
|
455 | (1) |
|
19.6 Regulation and Active Smoothing of the Supply |
|
|
456 | (2) |
|
19.7 SPICE Simulation of Power Supplies |
|
|
458 | (1) |
|
|
458 | (2) |
|
19.9 Grounding Architectures |
|
|
460 | (2) |
|
19.10 Radiated Magnetic Fields |
|
|
462 | (1) |
|
|
462 | (1) |
|
|
463 | (1) |
|
19.13 Switching Power Supplies (SMPS) |
|
|
464 | (2) |
|
20 Switching Power Supplies |
|
|
466 | (50) |
|
|
467 | (1) |
|
20.2 Isolated DC-DC Converter |
|
|
467 | (2) |
|
|
469 | (6) |
|
20.4 Synchronous Buck Converter |
|
|
475 | (1) |
|
|
476 | (1) |
|
20.6 Buck-Boost Converters |
|
|
477 | (1) |
|
20.7 Boost-Buck Converters |
|
|
478 | (1) |
|
|
478 | (1) |
|
|
479 | (1) |
|
|
480 | (2) |
|
20.11 Half-Bridge Converters |
|
|
482 | (1) |
|
20.12 Full-Bridge Converters |
|
|
483 | (1) |
|
20.13 Control ICs for PWM Converters |
|
|
484 | (1) |
|
20.14 Resonant Converters |
|
|
485 | (8) |
|
20.15 Quasi-Resonant Converters |
|
|
493 | (5) |
|
20.16 EMI Filtering and Suppression |
|
|
498 | (4) |
|
20.17 Power Factor Correction |
|
|
502 | (4) |
|
|
506 | (1) |
|
20.19 Switching Supplies for Power Amplifiers |
|
|
507 | (5) |
|
20.20 Switching Supplies for Class D Amplifiers |
|
|
512 | (4) |
|
21 Clipping Control and Civilized Amplifier Behavior |
|
|
516 | (9) |
|
21.1 The Incidence of Clipping |
|
|
516 | (1) |
|
21.2 Clipping and Sticking |
|
|
517 | (1) |
|
21.3 Negative Feedback and Clipping |
|
|
518 | (1) |
|
|
518 | (3) |
|
|
521 | (1) |
|
|
522 | (1) |
|
21.7 Parasitic Oscillation Bursts |
|
|
523 | (1) |
|
21.8 Selectable Output Impedance |
|
|
523 | (2) |
|
22 Interfacing the Real World |
|
|
525 | (10) |
|
22.1 The Amplifier-Loudspeaker Interface |
|
|
525 | (3) |
|
22.2 EMI Ingress: Antennas Everywhere |
|
|
528 | (3) |
|
|
531 | (1) |
|
|
532 | (1) |
|
|
533 | (1) |
|
|
533 | (1) |
|
22.7 EMI Susceptibility Testing |
|
|
533 | (2) |
Part 4 Simulation and Measurement |
|
535 | (112) |
|
|
537 | (34) |
|
|
537 | (3) |
|
|
540 | (2) |
|
23.3 DC, AC and Transient Simulation |
|
|
542 | (4) |
|
|
546 | (2) |
|
|
548 | (1) |
|
23.6 Controlled Voltage and Current Sources |
|
|
548 | (2) |
|
23.7 Swept and Stepped Simulations |
|
|
550 | (1) |
|
|
551 | (3) |
|
|
554 | (2) |
|
|
556 | (3) |
|
23.11 Simulating a Power Amplifier |
|
|
559 | (8) |
|
23.12 Middlebrook and Tian Probes |
|
|
567 | (4) |
|
24 SPICE Models and Libraries |
|
|
571 | (36) |
|
24.1 Verging SPICE Models |
|
|
572 | (1) |
|
24.2 7iveaking SPICE Models |
|
|
573 | (3) |
|
24.3 Creating a SPICE Model |
|
|
576 | (14) |
|
|
590 | (2) |
|
24.5 Vertical Power MOSFET Models |
|
|
592 | (5) |
|
24.6 LTspice® VDMOS Models |
|
|
597 | (4) |
|
|
601 | (4) |
|
24.8 Lateral Power MOSFETs |
|
|
605 | (1) |
|
|
606 | (1) |
|
|
607 | (17) |
|
25.1 Basic Audio Test Instruments |
|
|
607 | (1) |
|
|
608 | (1) |
|
25.3 Simulated Loudspeaker Loads |
|
|
609 | (1) |
|
|
610 | (3) |
|
25.5 PC-Based Instruments |
|
|
613 | (2) |
|
25.6 Purpose-Built Test Gear |
|
|
615 | (9) |
|
26 Distortion and Its Measurement |
|
|
624 | (16) |
|
26.1 Nonlinearity and Its Consequences |
|
|
624 | (1) |
|
26.2 Total Harmonic Distortion |
|
|
625 | (2) |
|
|
627 | (1) |
|
|
628 | (1) |
|
26.5 Transient Intermodulation Distortion (TIM) and SID |
|
|
629 | (1) |
|
26.6 Phase Intermodulation Distortion (PIM) |
|
|
630 | (3) |
|
26.7 Interface Intermodulation Distortion (IIM) |
|
|
633 | (3) |
|
26.8 Multitone Intermodulation Distortion (MIM) |
|
|
636 | (1) |
|
26.9 Highly Sensitive Distortion Measurement |
|
|
636 | (1) |
|
26.10 Input-Referred Distortion Analysis |
|
|
637 | (3) |
|
|
640 | (7) |
|
27.1 Measuring Damping Factor |
|
|
640 | (1) |
|
27.2 Sniffing Parasitic Oscillations |
|
|
641 | (1) |
|
27.3 EMI Ingress Susceptibility |
|
|
642 | (1) |
|
27.4 Burst Power and Peak Current |
|
|
643 | (1) |
|
|
644 | (1) |
|
|
644 | (1) |
|
|
644 | (3) |
Part 5 Topics in Amplifier Design |
|
647 | (64) |
|
28 The Negative Feedback Controversy |
|
|
649 | (8) |
|
28.1 How Negative Feedback Got Its Bad Rap |
|
|
649 | (1) |
|
28.2 Negative Feedback and Open-Loop Bandwidth |
|
|
650 | (1) |
|
28.3 Spectral Growth Distortion |
|
|
651 | (3) |
|
28.4 Global Versus Local Feedback |
|
|
654 | (1) |
|
28.5 Timeliness of Correction |
|
|
654 | (1) |
|
28.6 EMI from the Speaker Cable |
|
|
655 | (1) |
|
28.7 Stability and Burst Oscillations |
|
|
655 | (1) |
|
|
656 | (1) |
|
29 Amplifiers Without Negative Feedback |
|
|
657 | (17) |
|
29.1 Design Trade-Offs and Challenges |
|
|
657 | (9) |
|
29.2 Additional Design Techniques |
|
|
666 | (4) |
|
29.3 An Example Design with No Feedback |
|
|
670 | (1) |
|
29.4 A Feedback Amplifier with Wide Open-Loop Bandwidth |
|
|
670 | (4) |
|
30 Balanced and Bridged Amplifiers |
|
|
674 | (10) |
|
30.1 Balanced Input Amplifiers |
|
|
674 | (5) |
|
|
679 | (1) |
|
|
680 | (4) |
|
31 Integrated Circuit Power Amplifiers and Drivers |
|
|
684 | (10) |
|
|
684 | (1) |
|
|
684 | (2) |
|
31.3 The Super Gain Clone |
|
|
686 | (2) |
|
31.4 Integrated Circuit Drivers |
|
|
688 | (5) |
|
|
693 | (1) |
|
32 Professional Power Amplifiers |
|
|
694 | (17) |
|
32.1 Environment and Special Needs |
|
|
696 | (1) |
|
32.2 Output Stages and Output Power |
|
|
697 | (2) |
|
|
699 | (4) |
|
32.4 Cooling and Heat Removal |
|
|
703 | (1) |
|
|
703 | (1) |
|
32.6 Networked Control and Monitoring |
|
|
704 | (1) |
|
32.7 Digital Signal Processing |
|
|
705 | (1) |
|
32.8 DSP-Based Protection and Monitoring |
|
|
705 | (2) |
|
32.9 The DSP to Class D Interface |
|
|
707 | (1) |
|
|
707 | (1) |
|
|
708 | (3) |
Part 6 Class D Amplifiers |
|
711 | (56) |
|
33 Class D Audio Amplifiers |
|
|
713 | (9) |
|
33.1 How Class D Amplifiers Work |
|
|
714 | (1) |
|
33.2 Class D Output Stages |
|
|
715 | (3) |
|
33.3 Bridge Tied Load Designs (BTL) |
|
|
718 | (1) |
|
|
718 | (3) |
|
33.5 Noise Shaping in PWM Modulators with Feedback |
|
|
721 | (1) |
|
|
721 | (1) |
|
|
722 | (19) |
|
34.1 The Output Filter and EMI |
|
|
722 | (4) |
|
34.2 Spread Spectrum Class D |
|
|
726 | (1) |
|
34.3 Filterless Class D Amplifiers |
|
|
726 | (1) |
|
34.4 Buck Converters and Class D Amplifiers |
|
|
726 | (4) |
|
34.5 Sources of Distortion |
|
|
730 | (5) |
|
|
735 | (1) |
|
34.7 Power Supply Rejection |
|
|
736 | (2) |
|
34.8 Power Supplies for Class D Amplifiers |
|
|
738 | (1) |
|
34.9 Damping Factor and Load Invariance |
|
|
739 | (1) |
|
|
739 | (2) |
|
35 Alternative Class D Modulators |
|
|
741 | (11) |
|
35.1 Self-Oscillating Loops |
|
|
741 | (4) |
|
35.2 Sigma-Delta Modulators |
|
|
745 | (4) |
|
|
749 | (3) |
|
36 Class D Measurement, Efficiency and Designs |
|
|
752 | (15) |
|
|
752 | (1) |
|
36.2 Measuring Class D Amplifiers |
|
|
753 | (10) |
|
36.3 Achievable Performance |
|
|
763 | (1) |
|
36.4 Integrated Circuits for Class D Amplifiers |
|
|
764 | (1) |
|
36.5 Example Class D Amplifiers and Measurements |
|
|
764 | (3) |
Index |
|
767 | |