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PCB Currents: How They Flow, How They React

PCB Currents: How They Flow, How They React

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  • Copyright 2013
  • Dimensions: 7" x 9"
  • Edition: 1st
  • eBook (Watermarked)
  • ISBN-10: 0-13-341541-4
  • ISBN-13: 978-0-13-341541-4

The Plain-English Guide to Electronics and Current Flow for Every PCB Designer

Today, PCB designers must deal with issues such as crosstalk and EMI-–issues that were once associated only with components. This requires electronics knowledge that many PCB designers never gain through formal training. In PCB Currents, renowned PCB designer Douglas Brooks teaches these essentials descriptively, in plain English, with as little reliance on mathematics as possible. Building on his widely praised seminars, Brooks explains what current is, how it flows, and how it reacts. He begins by reviewing the nature of current, and then explains current flow in basic circuits, discusses sources that supply and drive current, and addresses the unique problems associated with current on PCBs. Brooks concludes by thoroughly illuminating signal integrity issues caused by current flow. He offers practical design solutions for each common type of problem, as well as for complex challenges involving very high frequency harmonics and very short wavelengths.

Coverage includes

• Current: its fundamental nature, basic definitions, and key concepts

• Five fundamental laws of current, including Kirchoff’s law and Ohm’s law

• Basic circuit concepts: resistive circuits, reactive circuits, and impedance

• Voltage and current sources: Where electrons come from and why they move

• Current-related PCB issues: temperature, transmission lines, reflections, coupled currents, power distribution, skin effect, dielectric losses, and vias

• Solutions for signal integrity issues caused by current flow, from on-board inductance and apparent resistance changes to more complex problems

The text is written to be accessible and valuable for PCB designers at all levels of experience, whether they have engineering training or not.

Sample Content

Table of Contents

Preface ix

Part I: Nature of Current 1

Chapter 1: Electrons and Charges 3

Chapter 2: Basic Current Concepts 19

Chapter 3: Basic Current Laws 57

Part II Current Flow In Basic Circuits 65

Chapter 4: Resistive Circuits 67

Chapter 5: Reactive Circuits: Capacitors and Capacitance 77

Chapter 6: Reactive Circuits: Inductors and Inductance 91

Chapter 7: Reactive Circuits: Resonance 105

Chapter 8: Impedance 113

Chapter 9: Real Components and Parasitics 133

Chapter 10: Time Constants and Filters 143

Chapter 11: Transformers 159

Chapter 12: Differential Current Flow 173

Chapter 13: Semiconductors 181

Part III: Voltage and Current Sources 193

Chapter14: Voltage and Current Sources 195

Part IV: Current Flow On Circuit Boards 199

Chapter 15: Where Do Currents Flow on Circuit Boards 201

Chapter 16: Current and Trace Temperatures 205

Chapter 17: Current Reflections 213

Chapter 18: Coupled Currents/EMI/Crosstalk 233

Chapter 19: Current Distribution and Bypass Capacitors 249

Chapter 20: Frequency-Variable Resistance and Lossy Transmission Lines 263

Chapter 21: Currents and Vias 275

Chapter 22: Current and Signal Integrity 285

Appendices: 301

Appendix A:Current flow and Maxwell 303

Appendix B: Eye diagrams 307

Appendix C: Death of the Circuit Board 311

Index 313


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