Small Signal Audio Design
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1 Small Signal Audio Design Douglas Self AMSTERDAM BOSTON HEIDELBERG LONDON. NEW YORK OXFORD PARIS SAN DIEGO. SAN FRANCISCO SINGAPORE. SYDNEY TOKYO Focal Press is an imprint of Elsevier Focal Press
2 Contents Preface About the Author Acronyms xiii xvii xviii Chapter 1 The Basics 7 Signals 1 Amplifiers 2 Voltage Amplifiers 2 Transconductance Amplifiers 2 Current Amplifiers 3 Transimpedance Amplifiers 3 Negative Feedback 4 Nominal Signal Levels 5 Gain Structures 6 Amplification Then Attenuation 6 Attenuation Then Amplification 7 Raising the Input Signal to the Nominal Level 7 Active Gain Controls 8 Noise 8 Johnson Noise 9 Shot Noise 11 1//Noise (Flicker Noise) 12 Popcorn Noise 13 Summing Noise Sources 13 Noise in Amplifiers 14 Noise in Bipolar Transistors 16 Bipolar Transistor Voltage Noise 16 Bipolar Transistor Current Noise 17 Noise in JFETs 20 Noise in Op-Amps 21 Low-Noise Op-Amp Circuitry 22 Noise Measurements 23 How to Attenuate Quietly 23 Hi
3 iv Contents How to Amplify Quietly 25 How to Invert Quietly 26 How to Balance Quietly 28 Ultra-Low-Noise Design with Multipath Amplifiers 28 Ultra-Low-Noise Voltage Buffers 29 Ultra-Low-Noise Amplifiers 30 References 32 Chapter 2 Components 33 Conductors 33 Copper and Other Conductive Elements 34 The Metallurgy of Copper 35 Gold and Its Uses 35 Cable and Wiring Resistance 36 PCB Track Resistance 37 PCB Track-to-Track Crosstalk 39 Impedances and Crosstalk: A Case History 40 Resistors 42 Through-Hole Resistors 43 Surface-Mount Resistors 43 Resistor Imperfections 45 Resistor Noise 46 Resistor Non-Linearity 48 Capacitors 51 Capacitor Non-Linearity Examined 52 Non-Electrolytic Capacitor Non-Linearity 53 Electrolytic Capacitor Non-Linearity 58 Inductors 61 References 61 Chapter 3 Discrete Transistor Circuitry 63 Why Use Discrete Transistor Circuitry? 63 Bipolars and FETs 64 Bipolar Junction Transistors 64 The Transistor Equation 65 Beta 66 Unity-Gain Buffer Stages 66 The Simple Emitter-Follower 67 The Constant-Current Emitter-Follower 70 The Push-Pull Emitter-Follower 71 Emitter-Follower Stability 72 CFP Emitter-Followers 73 Improved Unity-Gain Buffers 75 Gain Stages 81
4 Contents One-Transistor Shunt-Feedback Gain Stages 81 One-Transistor Series-Feedback Gain Stages 82 Two-Transistor Shunt-Feedback Gain Stages 82 Two-Transistor Series-Feedback Gain Stages 87 Discrete Op-Amp Design 88 High-Input-Impedance Bipolar Stages 92 References 94 Chapter 4 Op-Amps and Their Properties 95 A Very Brief History of Op-Amps 95 Op-Amp Properties: Noise 96 Op-Amp Properties: Slew Rate 97 Op-Amp Properties: Common-Mode Range 98 Op-Amp Properties: Input Offset Voltage 98 Op-Amp Properties: Bias Current 99 Op-Amp Properties: Cost 100 Op-Amp Properties: Distortion 101 Op-Amp Internal Distortion 101 Slew-Rate-Limiting Distortion 101 Distortion Due to Loading 103 Thermal Distortion 104 Common-Mode Distortion 104 Bipolar input op-amps 104 FET op-amps 108 Rail bootstrapping to reduce CM distortion 110 Simpler rail bootstrapping 113 Bootstrapping series-feedback JFET op-amp stages 114 Selecting the Right Op-Amp 115 Op-Amps Surveyed: BJT Input Types 117 The LM741 Op-Amp 118 The NE5532/5534 Op-Amp 118 Deconstructing the The LM4562 Op-Amp 121 The AD797 Op-Amp 124 The OP27 Op-Amp 124 The OP270 Op-Amp 125 The OP275 Op-Amp 126 Op-Amps Surveyed: JFET Input Types 128 The TL072 Op-Amp 128 The TL052 Op-Amp 129 The OPA2134 Op-Amp 131 The OPA604 Op-Amp 132 The OPA627 Op-Amp 135 References 136
5 vi Contents Chapter 5 Filters 137 Passive Filters 137 Active Filters 138 Low-Pass Filters 138 High-Pass Filters 138 Combined Low-Pass and High-Pass Filters 139 Bandpass Filters 139 Notch Filters 139 All-Pass Filters 139 Filter Characteristics 140 Sallen-and-Key Filters 140 Distortion in Sallen-and-Key Filters 145 Multiple-Feedback Bandpass Filters 147 Making Notch Filters 148 Differential Filters 150 References 151 Chapter 6 Preamplifier Architectures 753 Passive Preamplifiers 153 Active Preamplifiers 155 Amplification and the gain-distribution problem 156 Active Gain Controls 158 Recording Facilities 158 Tone Controls 158 References 159 Chapter 7 Moving-Magnet Disc Inputs 161 The Vinyl Medium 161 Spurious Signals 162 Maximum Signal Levels on Vinyl 163 Equalization and Its Discontents 166 The 'Neumann Pole' 168 Implementing RIAA Equalization 168 Passive and Semi-Passive RIAA Equalization 171 Calculating the RIAA Equalization Components 175 RIAA Equalization Component Tolerances 175 Simulating Inverse RIAA Equalization 178 Physical Inverse RIAA Equalization 179 Overload Margins 179 Cartridge Impedances 181 Cartridge Loading 181 Cartridge-Preamplifier Interaction 183 Cartridge DC and AC Coupling 183
6 Contents vii Discrete MM Disc Input Stages 183 Op-Amp MM Disc Input Stages 187 Noise in RIAA Preamplifiers 191 Noise Results with A-Weighting 196 RIAA Noise Measurements 196 Electronic Cartridge Loading for Lower Noise 197 Subsonic Filters 201 Combining Subsonic and Ultrasonic Filters 204 References 204 Chapter 8 Moving-Coil Head Amplifiers 207 Moving-Coil Cartridge Characteristics 207 Amplification Strategies 208 Moving-Coil Transformers 209 Moving-Coil Input Amplifiers 210 A New Moving-Coil Amplifier Configuration 213 The Complete Circuit 216 Performance 216 References 218 Chapter 9 Volume and Balance Controls 279 Volume Controls 219 Volume Control Laws 220 Loaded Linear Pots 221 Dual-Action Volume Controls 223 Tapped Volume Controls 226 Slide Faders 229 Active Volume Controls 231 The Baxandall Active Volume Control 235 A Practical Baxandall Active Gain Stage 237 Potentiometers and DC 238 Motorized Potentiometers 239 Stepped Volume Controls 240 Switched Attenuator Volume Controls 241 Relay-Switched Volume Controls 249 Transformer-Tap Volume Controls 250 Integrated Circuit Volume Controls 250 Balance Controls: Passive 250 Active Balance Controls 252 Mono/Stereo Switches 254 Width Controls 254 References 255
7 viii Contents Chapter 10 Tone Controls and Equalizers 257 Passive Tone Controls 258 Baxandall Tone Controls 259 The Baxandall Two-Capacitor LF Control 260 The Baxandall Two-Capacitor Tone Control 263 The Baxandall Two-Capacitor HF Control 265 Switched-Frequency Baxandall Controls 266 Variable-Frequency LF and HF EQs 267 Tone-Balance Controls 269 Middle Controls 271 Fixed-Frequency Baxandall Middle Controls 271 Three-Band Baxandall EQ in One Stage 273 Wien Fixed Middle EQ 276 Sweep Middles 276 The Single-Gang Sweep Middle 278 Switched-Q Variable-Frequency Wien Middle EQs 280 Switchable Peak/Shelving LF/HF EQs 281 Parametric Middle EQs 283 Graphic Equalizers 286 References 289 Chapter 11 A Complete Preamplifier 291 Architecture and Philosophy 291 The Line Inputs 293 The High-Impedance Input Buffer 293 The Tone-Control Stage 294 The Active Gain Stage 300 Performance 301 References 302 Chapter 12 Mixer Architectures 303 Performance Factors 303 Mixer Internal Levels 304 Mixer Architecture 305 The Split Mixing Architecture 306 The In-Line Mixing Architecture 308 A Closer Look at Split-Format Modules 310 The Channel Module (Split Format) 310 Effects Return Modules 313 The Group Module 314 The Master Module 316 Talkback and Oscillator Systems 317 The In-Line Channel Module 319
8 Contents ix Chapter 13 Microphone Preamplifiers 323 Microphone Preamplifier Requirements 323 Transformer Microphone Inputs 324 The Simple Hybrid Microphone Preampilifier 325 The Balanced-Feedback Hybrid Microphone Preampilifier 326 Microphone and Line-Input Pads 329 The Padless Microphone Preampilifier 331 Capacitor Microphone Head Amplifiers 335 Chapter 14 Line Inputs 339 External Signal Levels 339 Internal Signal Levels 339 Input Amplifier Functions 340 Unbalanced Inputs 340 Balanced Interconnections 344 The Advantages of Balanced Interconnections 345 The Disadvantages of Balanced Interconnections 345 Balanced Cables and Interference 346 Electrostatic Coupling 346 Magnetic Coupling 347 Ground Voltages 348 Balanced Connectors 348 Balanced Signal Levels 348 Electronic vs. Transformer Balanced Inputs 349 Common-Mode Rejection 349 The Basic Electronic Balanced Input 352 Common-Mode Rejection: The Basic Balanced Input and Op-Amp Effects 354 Op-Amp Frequency Response Effects 355 Op-Amp CMRR Effects 357 Amplifier Component Mismatch Effects 357 A Practical Balanced Input 359 Variations on the Balanced Input Stage 362 Combined Unbalanced and Balanced Inputs 362 The Superbal Input 363 Switched-Gain Balanced Inputs 364 Variable-Gain Balanced Inputs 365 High-Input-Impedance Balanced Inputs 366 The Inverting Two-Op-Amp Input 367 The Instrumentation Amplifier 368 Transformer Balanced Inputs 370 Input Overvoltage Protection 371 Low-Noise Balanced Inputs 372 Low-Noise Balanced Inputs in Real Life 377
9 x Contents Ultra-Low-Noise Balanced Inputs 378 References 380 Chapter 15 Line Outputs 381 Unbalanced Outputs 381 Zero-Impedance Outputs 382 Ground-Canceling Outputs 383 Balanced Outputs 386 Quasi-Floating Outputs 386 Transformer Balanced Outputs 388 Driving Heavy Loads 389 Reference 392 Chapter 16 Signal Switching 393 Mechanical Switches 393 Input-Select Switching 394 The Virtual Contact 395 Relay Switching 397 Electronic Switching 397 Switching with CMOS Analog Gates 397 CMOS Gates in Voltage Mode 399 CMOS Gates in Current Mode 404 Series-Shunt Current Mode 406 Control Voltage Feedthrough in CMOS Gates 407 Discrete JFET Switching 407 JFETs in Voltage Mode: The Series JFET Switch 408 The Shunt JFET Switch in Voltage Mode 413 JFETs in Current Mode 414 Reducing Distortion by Biasing 417 JFET Drive Circuitry 418 Physical Layout and Offness 419 Dealing with the DC Conditions 420 A Soft Changeover Circuit 420 Control-voltage feedthrough in JFETs 421 Reference 421 Chapter 17 Mixer Subsystems 423 Mixer Bus Systems 423 Input Arrangements 424 Equalization 424 Insert Points 424 How to Move a Circuit Block 426 Faders 428 Postfade Amplifiers 428
10 Contents xi Direct Outputs 430 Panpots 431 Passive Panpots ; 432 The Active Panpot 438 LCR Panpots 439 Routing Systems 442 Auxiliary Sends 446 Group Module Circuit Blocks 446 Summing Systems 447 Voltage Summing 447 Virtual-Earth Summing 448 Balanced Summing Systems 449 Ground-Canceling Summing Systems 451 Distributed Summing Systems 452 Summing Amplifiers 456 Hybrid Summing Amplifiers 459 Balanced Hybrid Summing Amplifiers 462 PFL Systems 465 PFL Summing 466 PFL Switching 466 PFL Detection 468 Virtual-Earth PFL Detection 469 AFL Systems 471 Solo-in-Place Systems 473 Talkback Microphone Amplifiers 473 Line-Up Oscillators 474 Console Cooling and Component Lifetimes 477 Chapter 18 Level Indication and Metering 479 Signal-Present Indication 479 Peak Indication 479 Distributed Peak Detection 481 Combined LED Indicators 483 VU Meters 483 PPM Meters 485 LED Bar-Graph Metering 486 A More Efficient LED Bar-Graph Architecture 488 Vacuum Fluorescent Displays 491 LCD Meter Displays 491 Chapter 19 Level Control and Special Circuits 493 Gain-Control Elements 493 A Brief History 493 JFETs 493
11 xii Contents Operational Transconductance Amplifiers 496 Voltage-Controlled Amplifiers 497 Compressors and Limiters 499 Attack Artefacts 503 Decay Artefacts 504 Subtractive VCA Control 505 Noise Gates 506 Clipping 508 Diode Clipping 508 Active Clipping with Transistors 510 Active Clipping with Op-Amps 512 Noise Generators 521 Pinkening Filters 523 References 524 Chapter 20 Power Supplies 525 Op-Amp Supply-Rail Voltages 525 Designing a ±15 V Supply 527 Designing a ±17 V Supply 529 Using Variable-Voltage Regulators 531 Improving Ripple Performance 532 Dual Supplies From a Single Winding 533 Power Supplies for Discrete Circuitry 534 Larger Power Supplies 534 Mutual Shutdown Circuitry 536 Very Large Power Supplies 536 Microcontroller and Relay Supplies V Phantom Power Supplies 538 Reference 540 Chapter 21 Interfacing with the Digital Domain 541 PCB Layout Considerations 541 Nominal Levels and ADCs 542 Some Typical ADCs 543 Interfacing with ADC Inputs 544 Some Typical DACs 546 Interfacing with DAC Outputs 547 Index 549
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