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Preface | |
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EMC Theory | |
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Electromagnetic Compatibility | |
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Introduction | |
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Noise and Interference | |
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Designing for Electromagnetic Compatibility | |
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Engineering Documentation and EMC | |
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United States' EMC Regulations | |
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FCC Regulations | |
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FCC Part 15, Subpart B | |
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Emissions | |
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Administrative Procedures | |
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Susceptibility | |
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Medical Equipment | |
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Telecom | |
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Automotive | |
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Canadian EMC Requirements | |
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European Union's EMC Requirements | |
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Emission Requirements | |
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Harmonics and Flicker | |
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Immunity Requirements | |
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Directives and Standards | |
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International Harmonization | |
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The Regulatory Process | |
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Typical Noise Path | |
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Methods of Noise Coupling | |
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Conductively Coupled Noise | |
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Common Impedance Coupling | |
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Electric and Magnetic Field Coupling | |
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Miscellaneous Noise Sources | |
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Galvanic Action | |
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Electrolytic Action | |
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Triboelectric Effect | |
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Conductor Motion | |
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Use of Network Theory | |
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Summary | |
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Problems | |
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References | |
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Further Reading | |
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Cabling | |
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Capacitive Coupling | |
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Effect of Shield on Capacitive Coupling | |
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Inductive Coupling | |
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Mutual Inductance Calculations | |
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Effect of Shield on Magnetic Coupling | |
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Magnetic Coupling Between Shield and Inner Conductor | |
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Magnetic Coupling-Open Wire to Shielded Conductor | |
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Shielding to Prevent Magnetic Radiation | |
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Shielding a Receptor Against Magnetic Fields | |
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Common Impedance Shield Coupling | |
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Shield Transfer Impedance | |
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Coaxial Cable Versus Twisted Pair | |
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Braided Shields | |
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Spiral Shields | |
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Shield Terminations | |
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Pigtails | |
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Grounding of Cable Shields | |
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Ribbon Cables | |
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Electrically Long Cables | |
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Summary | |
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Problems | |
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References | |
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Further Reading | |
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Grounding | |
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AC Power Distribution and Safety Grounds | |
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Service Entrance | |
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Branch Circuits | |
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Noise Control | |
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Earth Grounds | |
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Isolated Grounds | |
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Separately Derived Systems | |
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Grounding Myths | |
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Signal Grounds | |
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Single-Point Ground Systems | |
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Multipoint Ground Systems | |
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Common Impedance Coupling | |
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Hybrid Grounds | |
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Chassis Grounds | |
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Equipment/System Grounding | |
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Isolated Systems | |
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Clustered Systems | |
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Distributed Systems | |
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Ground Loops | |
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Low-Frequency Analysis of Common-Mode Choke | |
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High-Frequency Analysis of Common-Mode Choke | |
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Single Ground Reference for a Circuit | |
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Summary | |
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Problems | |
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References | |
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Further Reading | |
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Balancing and Filtering | |
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Balancing | |
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Common-Mode Rejection Ratio | |
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Cable Balance | |
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System Balance | |
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Balanced Loads | |
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Filtering | |
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Common-Mode Filters | |
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Parasitic Effects in Filters | |
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Power Supply Decoupling | |
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Low-Frequency Analog Circuit Decoupling | |
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Amplifier Decoupling | |
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Driving Capacitive Loads | |
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System Bandwidth | |
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Modulation and Coding | |
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Summary | |
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Problems | |
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References | |
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Further Reading | |
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Passive Components | |
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Capacitors | |
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Electrolytic Capacitors | |
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Film Capacitors | |
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Mica and Ceramic Capacitors | |
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Feed-Through Capacitors | |
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Paralleling Capacitors | |
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Inductors | |
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Transformers | |
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Resistors | |
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Noise in Resistors | |
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Conductors | |
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Inductance of Round Conductors | |
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Inductance of Rectangular Conductors | |
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Resistance of Round Conductors | |
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Resistance of Rectangular Conductors | |
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Transmission Lines | |
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Characteristic Impedance | |
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Propagation Constant | |
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High-Frequency Loss | |
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Relationship Among C, L and �r. | |
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Final Thoughts | |
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Ferrites | |
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Summary | |
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Problems | |
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References | |
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Further Reading | |
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Shielding | |
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Near Fields and Far Fields | |
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Characteristic and Wave Impedances | |
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Shielding Effectiveness | |
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Absorption Loss | |
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Reflection Loss | |
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Reflection Loss to Plane Waves | |
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Reflection Loss in the Near Field | |
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Electric Field Reflection Loss | |
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Magnetic Field Reflection Loss | |
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General Equations for Reflection Loss | |
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Multiple Reflections in Thin Shields | |
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Composite Absorption and Reflection Loss | |
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Plane Waves | |
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Electric Fields | |
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Magnetic Fields | |
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Summary of Shielding Equations | |
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Shielding with Magnetic Materials | |
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Multiple Apertures | |
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Seams | |
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Transfer Impedance | |
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Waveguide Below Cutoff | |
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Conductive Gaskets | |
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Joints of Dissimilar Metals | |
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Mounting of Conductive Gaskets | |
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The "Ideal" Shield | |
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Conductive Windows | |
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Transparent Conductive Coatings | |
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Wire Mesh Screens | |
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Mounting of Windows | |
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Conductive Coatings | |
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Conductive Paints | |
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Flame/Arc Spray | |
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Vacuum Metalizing | |
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Electroless Plating | |
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Metal Foil Linings | |
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Filled Plastic | |
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Internal Shields | |
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Cavity Resonance | |
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Grounding of Shields | |
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Summary | |
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Problems | |
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References | |
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Further Reading | |
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Contact Protection | |
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Glow Discharges | |
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Metal-Vapor or Arc Discharges | |
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AC Versus DC Circuits | |
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Contact Material | |
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Contact Rating | |
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Loads with High Inrush Currents | |
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Inductive Loads | |
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Contact Protection Fundamentals | |
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C Network | |
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R-C Network | |
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R-C-D Network | |
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Inductive Loads Controlled by a Transistor Switch | |
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Resistive Load Contact Protection | |
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Contact Protection Selection Guide | |
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Examples | |
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Summary | |
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Problems | |
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References | |
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Further Reading | |
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Intrinsic Noise Sources | |
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Thermal Noise | |
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Characteristics of Thermal Noise | |
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Equivalent Noise Bandwidth | |
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Shot Noise | |
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Contact Noise | |
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Popcorn Noise | |
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Addition of Noise Voltages | |
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Measuring Random Noise | |
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Summary | |
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Problems | |
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References | |
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Further Reading | |
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Active Device Noise | |
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Noise Factor | |
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Measurement of Noise Factor | |
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Single-Frequency Method | |
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Noise Diode Method | |
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Calculating S/N Ratio and Input Noise Voltage from Noise Factor | |
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Noise Voltage and Current Model | |
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Measurment of Vn and In | |
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Calculating Noise Factor and S/N Radio from Vn-In | |
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Optimum Source Resistance | |
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Noise Factor of Cascaded Stages | |
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Transistor Noise Factor | |
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Vn-In for Transistors | |
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Field-Effect Transistor Noise | |
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FET Noise Factor | |
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Vn-In Representation of FET Noise | |
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Noise in Operational Amplifiers | |
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Methods of Specifying Op-Amp Noise | |
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Op-Amp Noise Factor | |
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Summary | |
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Problems | |
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References | |
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Further Reading | |
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Frequency Versus Time Domain | |
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Analog Versus Digital Circuits | |
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Digital Logic Noise | |
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Internal Noise Sources | |
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Digital Circuit Ground Noise | |
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Minimizing Inductance | |
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Mutual Inductance | |
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Practical Digital Circuit Ground Systems | |
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Loop Area | |
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Ground Plane Current Distribution and Impedance | |
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Reference Plane Current Distribution | |
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Ground Plane Impedance | |
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Ground Plane Voltage | |
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End Effects | |
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Digital Logic Current Flow | |
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Microstrip Line | |
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Stripline | |
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Digital Circuit Current Flow Summary | |
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Summary | |
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Problems | |
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References | |
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Further Reading | |
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EMC Applications | |
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Digital Circuit Power Distribution | |
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Power Supply Decoupling | |
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Transient Power Supply Currents | |
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Transient Load Current | |
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Dynamic Internal Current | |
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Fourier Spectrum of the Transient Current | |
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Total Transient Current | |
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Decoupling Capacitors | |
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Effective Decoupling Strategies | |
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Multiple Decoupling Capacitors | |
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Multiple Capacitors of the Same Value | |
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Multiple Capacitors of Two Different Values | |
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Multiple Capacitors of Many Different Values | |
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Target Impedance | |
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Embedded PCB Capacitance | |
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Power Supply Isolation | |
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The Effect of Decoupling on Radiated Emissions | |
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Decoupling Capacitor Type and Value | |
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Decoupling Capacitor Placement and Mounting | |
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Bulk Decoupling Capacitors | |
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Power Entry Filters | |
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Summary | |
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Problems | |
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References | |
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Further Reading | |
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Digital Circuit Radiation | |
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Differential-Mode Radiation | |
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Loop Area | |
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Loop Current | |
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Fourier Series | |
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Radiated Emission Envelope | |
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Controlling Differential-Mode Radiation | |
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Board Layout | |
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Canceling Loops | |
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Dithered Clocks | |
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Common-Mode Radiation | |
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Controlling Common-Mode Radiation | |
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Common-Mode Voltage | |
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Cable Filtering and Shielding | |
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Separate I/O Grounds | |
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Dealing With Common-Mode Radiation Issues | |
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Summary | |
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Problems | |
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References | |
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Further Reading | |
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Conducted Emissions | |
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Power Line Impedance | |
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Line Impedance Stabilization Network | |
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Switched-Mode Power Supplies | |
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Common-Mode Emissions | |
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Differential-Mode Emissions | |
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DC-to-DC Converters | |
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Rectifier Diode Noise | |
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Power-Line Filters | |
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Common-Mode Filtering | |
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Differential-Mode Filtering | |
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Leakage Inductance | |
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Filter Mounting | |
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Power Supplies with Integral Power-Line Filters | |
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High-Frequency Noise | |
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Primary-to-Secondary Common-Mode Coupling | |
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Frequency Dithering | |
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Power Supply Instability | |
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Magnetic Field Emissions | |
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Variable Speed Motor Drives | |
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Harmonic Suppression | |
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Inductive Input Filters | |
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Active Power Factor Correction | |
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AC Line Reactors | |
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Summary | |
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Problems | |
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References | |
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Further Reading | |
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RF and Transient Immunity | |
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Performance Criteria | |
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RF Immunity | |
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The RF Environment | |
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Audio Rectification | |
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RFI Mitigation Techniques | |
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Transient Immunity | |
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Electrostatic Discharge | |
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Electrical Fast Transient | |
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Lightning Surge | |
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Transient Suppression Networks | |
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Signal Line Suppression | |
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Protection of High-Speed Signal Lines | |
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Power Line Transient Suppression | |
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Hybrid Protection Network | |
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Power Line Disturbances | |
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Power Line Immunity Curve | |
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Summary | |
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Problems | |
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References | |
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Further Reading | |
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Electrostatic Discharge | |
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Static Generation | |
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Inductive Charging | |
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Energy Storage | |
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Human Body Model | |
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Static Discharge | |
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Decay Time | |
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ESD Protection in Equipment Design | |
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Preventing ESD Entry | |
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Metallic Enclosures | |
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Input/Output Cable Treatment | |
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Insulated Enclosures | |
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Keyboards and Control Panels | |
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Hardening Sensitive Circuits | |
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ESD Grounding | |
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Nongrounded Products | |
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Field-Induced Upset | |
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Inductive Coupling | |
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Capacitive Coupling | |
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Transient Hardened Software Design | |
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Detecting Errors in Program Flow | |
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Detecting Errors in Input/Output | |
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Detecting Errors in Memory | |
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Time Windows | |
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Summary | |
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Problems | |
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References | |
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Further Reading | |
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PCB Layout and Stackup | |
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General PCB Layout Considerations | |
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Partitioning | |
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Keep Out Zones | |
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Critical Signals | |
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System Clocks | |
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PCB-to-Chassis Ground Connection | |
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Return Path Discontinuities | |
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Slots in Ground/Power Planes | |
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Split Ground/Power Planes | |
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Changing Reference Planes | |
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Referencing the Top and Bottom of the Same Plane | |
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Connectors | |
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Ground Fill | |
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PCB Layer Stackup | |
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One- and Two-Layer Boards | |
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Multilayer Boards | |
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General PCB Design Procedure | |
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Summary | |
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Problems | |
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References | |
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Further Reading | |
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Mixed-Signal PCB Layout | |
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Split Ground Planes | |
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Microstrip Ground Plane Current Distribution | |
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Analog and Digital Ground Pins | |
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When Should Split Ground Planes Be Used? | |
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Mixed Signal ICs | |
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Multi-Board Systems | |
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High-Resolution A/D and D/A Converters | |
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Stripline | |
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Asymmetric Stripline | |
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Isolated Analog and Digital Ground Planes | |
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A/D and D/A Converter Support Circuitry | |
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Sampling Clocks | |
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Mixed-Signal Support Circuitry | |
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Vertical Isolation | |
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Mixed-Signal Power Distribution | |
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Power Distribution | |
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Decoupling | |
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The IPC Problem | |
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Summary | |
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Problems | |
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References | |
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Further Reading | |
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Precompliance EMC Measurements | |
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Test Environment | |
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Antennas Versus Probes | |
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Common-Mode Currents on Cables | |
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Test Procedure | |
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Cautions | |
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Near Field Measurements | |
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Test Procedure | |
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Cautions | |
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Seams and Apertures in Enclosures | |
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Noise Voltage Measurements | |
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Balanced Differential Probe | |
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DC to 1-GHz Probe | |
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Cautions | |
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Conducted Emission Testing | |
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Test Procedure | |
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Cautions | |
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Separating C-M from D-M Noise | |
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Spectrum Analyzers | |
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Detector Functions | |
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General Test Procedure | |
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EMC Crash Cart | |
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Mitigation Parts List | |
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One-Meter Radiated Emission Measurements | |
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Test Environment | |
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Limits for 1-m Testing | |
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Antennas for 1-m Testing | |
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Precompliance Immunity Testing | |
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Radiated Immunity | |
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Conducted Immunity | |
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Transient Immunity | |
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Precompliance Power Quality Tests | |
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Harmonics | |
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Flicker | |
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Margin | |
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Radiated Emission Margin | |
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Electrostatic Discharge Margin | |
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Summary | |
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Problems | |
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References | |
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Further Reading | |
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Appendix | |
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The Decibel | |
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Properties of Logarithms | |
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Using the Decibel for Other than Power Measurements | |
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Power Loss or Negative Power Gain | |
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Absolute Power Level | |
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Summing Powers Expressed in Decibels | |
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The Ten Best Ways to Maximize the Emission from Your Product | |
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Multiple Reflections of Magnetic Fields in Thin Shields | |
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Dipoles for Dummies | |
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Basic Dipoles for Dummies | |
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Intermediate Dipoles for Dummies | |
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Advanced Dipoles for Dummies | |
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Impedance of a Dipole | |
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Dipole Resonance | |
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Receiving Dipole | |
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Theory of Images | |
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Dipole Arrays | |
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Very High-Frequency Dipoles | |
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Summary | |
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Further Reading | |
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Partial Inductance | |
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Inductance | |
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Loop Inductance | |
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Inductance of a Rectangular Loop | |
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Partial Inductance | |
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Partial Self-Inductance | |
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Partial Mutual Inductance | |
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Net Partial-Inductance | |
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Partial Inductance Applications | |
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Transmission Line Example | |
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Ground Plane Inductance Measurement Test Setup | |
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Inductance Notation | |
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Summary | |
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References | |
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Further Reading | |
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Answers to Problems | |
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Index | |