Real Analog Solutions for Digital Designers.pdf

(9884 KB) Pobierz
Microsoft Photo Editor - Copyright.jpg
23431920.001.png
A Baker’s Dozen
23431920.002.png
Contents
Preface .....................................................................................................ix
Acknowledgments ......................................................................................xi
About the Author ....................................................................................xiii
Chapter 1: Bridging the Gap Between Analog and Digital ..............................1
Try to Measure Temperature Digitally .......................................................................................6
Road Blocks Abound .................................................................................................................8
The Ultimate Key to Analog Success ......................................................................................14
How Analog and Digital Design Differ ...................................................................................15
Time and Its Inversion ..............................................................................................................20
Organizing Your Toolbox .........................................................................................................21
Set Your Foundation and Move On, Out of the Box ................................................................22
Chapter 1 References ...............................................................................................................23
Chapter 2: The Basics Behind Analog-to-Digital Converters ..........................25
The Key Specifications of Your ADC ......................................................................................28
Successive Approximation Register (SAR) Converters ...........................................................40
Sigma-Delta (Σ−∆) Converters ................................................................................................46
Conclusion ...............................................................................................................................59
Chapter 2 References ...............................................................................................................60
Chapter 3: The Right ADC for the Right Application ...................................63
Classes of Input Signals ..........................................................................................................65
Using an RTD for Temperature Sensing: SAR Converter or Sigma-Delta Solution? .............72
RTD Signal Conditioning Path Using the Sigma-Delta ADC ................................................76
Measuring Pressure: SAR Converter or Sigma-Delta Solution? .............................................77
The Pressure Sensor Signal Conditioning Path Using a SAR ADC .......................................79
Pressure Sensor Signal Conditioning Path Using a Sigma-Delta ADC ...................................80
Photodiode Applications ..........................................................................................................81
Photosensing Signal Conditioning Path Using a SAR ADC ...................................................81
Photosensing Signal Conditioning Path Using a Sigma-Delta ADC .......................................82
Motor Control Solutions ..........................................................................................................83
v
Contents
Conclusion ..............................................................................................................................88
Chapter 3 References ...............................................................................................................89
Chapter 4: Do I Filter Now, Later or Never? ...............................................91
Key Low-Pass Analog Filter Design Parameters .....................................................................95
Anti-Aliasing Filter Theory ...................................................................................................103
Analog Filter Realization .......................................................................................................105
How to Pick Your Operational Amplifier ...............................................................................108
Anti-Aliasing Filters for Near DC Analog Signals ................................................................109
Multiplexed Systems ..............................................................................................................112
Continuous Analog Signals ....................................................................................................114
Matching the Anti-Aliasing Filter to the System ...................................................................115
Chapter 4 References .............................................................................................................116
Chapter 5: Finding the Perfect Op Amp for Your Perfect Circuit .................117
Choose the Technology Wisely ..............................................................................................121
Fundamental Operational Amplifier Circuits .........................................................................122
Using these Fundamentals .....................................................................................................129
Amplifier Design Pitfalls .......................................................................................................131
Chapter 5 References .............................................................................................................133
Chapter 6: Putting the Amp Into a Linear System ......................................135
The Basics of Amplifier DC Operation ..................................................................................137
Every Amplifier is Waiting to Oscillate, and Every Oscillator is
Waiting to Amplify .............................................................................................................151
Determining System Stability ...............................................................................................157
Time Domain Performance ....................................................................................................161
Go Forth ................................................................................................................................163
Chapter 6 References .............................................................................................................164
Chapter 7: SPICE of Life ........................................................................165
The Old Pencil and Paper Design Process .............................................................................172
Is Your Simulation Fundamentally Valid? ..............................................................................175
Macromodels: What Can They Do? ......................................................................................179
Concluding Remarks ..............................................................................................................183
Chapter 7 References .............................................................................................................184
Chapter 8: Working the Analog Problem From the Digital Domain .............185
Pulse Width Modulators (PWM) Used as a Digital-to-Analog Converter .............................188
Using the Comparator for Analog Conversions .....................................................................194
vi

Plik z chomika:

Inne pliki z tego folderu:

Inne foldery tego chomika:

Zgłoś jeśli naruszono regulamin