Learn how to design printed circuit boards and systems quickly with just five easy equations. Electromagnetic compatibility requirements are easily achieved with the author's unique approach by transforming Ma This book simplifies the complex field of electromagnetic compatibility into easy concepts without the need for complicated math or extensive computational analysis.
Electromagnetic compatibility requirements are easily achieved with the author's unique approach by transforming Maxwell's Equations calculus into Ohm's Law algebra in a visual manner. Everyone, regardless of experience, will benefit from learning a new way of solving complex field problems using an oscilloscope instead of a spectrum analyzer. Signal propagation is based on transmission line theory. If one can visualize losses in a transmission line, it becomes easy to achieve EMC at low cost as well as enhanced signal integrity.
Easy to read chapters simplify theoretical concepts for those who never took a electromagnetics course in college, or designers that seek to re-learn and understand electromagnetic theory as it applies to both printed circuit boards and systems presented in a revolutionary manner. Get A Copy.
EMC and the Printed Circuit Board: Design, Theory, and Layout Made Simple
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To see what your friends thought of this book, please sign up. Lists with This Book. This book is not yet featured on Listopia. Time - Is the problem continuous periodic signals or does the problem exist only during certain cycles of operation e. Impedance - What is the impedance of both the source and receptor unit? Dimensions - What are the physical dimensions of the device?
Three basic elements for an EMC event to be observed There must be a source of energy. There must be a receptor that is upset by this energy. There must be a coupling path between the source and receptor for the unwanted energy to transfer to. The propagation path may be either by radiated or conducted means. In the direction of current flow. Only the magnetic field is shown as a flux line. Fields propagate from a field source near the velocity of light. For a multi-layer PCB, loop area is in the plane directly below the signal path. Conveys desired information. Does not cause interference as the fields generated oppose each other and cancel out.
Common-mode 1. The major source of cable radiation. Contains no useful information. Has no useful purpose. Causes a system traces, cables, etc. Current transients are created by the production of high frequency periodic signals injected into the power and return distribution network. An RF voltage drop develops across any impedance within a transmission line.
Radiated emissions, created by these common-mode RF currents, are observed on internal antenna structures by virtue of poor RF ground loop or return path control. When any time-variant current is injected into a trace, magnetic flux is developed, which in turn creates an electric field. The combination of electric and magnetic fields create a propagating plane wave. Often a ground reference may serve multiple needs, each with a different application. Single-Point: Best for use when signals are below 1 MHz.
Most sensitive circuit returns should be connected closest to the final equipotential point. Provides for greatest amount of loop currents to flow. Divided into two type: series and parallel. Multi-Point: Preferred for frequencies above 1 MHz.
Minimized loop currents and ground impedance of the planes. A good low inductance ground is necessary for high-frequency digital logic circuits. Ground plane s provides a low inductance ground return for RF currents. Lead inductance must be kept extremely short. Hybrid: For mixed technology products. Resonance in a Multi-Point Ground Printed circuit board. Mounting plate or chassis Mounting posts Eddy currents Internal power plane capacitance Inductance in the power planes Z Z I cm V cm by eddy currents across impedance Z post.
Resonance is thus controlled, along with enhanced RF suppression. Through-holes multiple holes in one straight line creates a slot in the ground plane.
Return current must travel around the slot. Optimal method of routing traces if through-hole Through-holes multiple holes spaced apart components must be used. Power Distribution Networks as Transmission Lines Power distribution networks can be represented as a two conductor transmission line with a defined characteristic impedance and propagation delay.
Defining Capacitor Usage Capacitors are used for one of three primary functions. Bulk Used to maintain constant DC voltage and current levels on a global basis due to IR drops within the power distribution network, and to recharge the distribution network i. Bypassing Diverts or steers RF currents from one location to another. Shunts unwanted common-mode RF currents from components or cables from entering susceptible areas in addition to providing other functions of filtering bandwidth limited.
Decoupling Provides a localized source of DC power, and are particularly useful in reducing peak current surges propagated across the board.
Prevents RF currents from being injected into the power distribution network during digital component edge transitions. Switching transient capacitance 0. Line charging capacitance 0. Supply current bursts for fast switching circuits power delivery system issues-PDS to prevent power and return bounce.
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To lower the impedance of the power delivery system and prevent energy transference from one circuit to another sharing the same voltage levels. To provide an AC shunt connection between power and return planes for RF signal return current layer jumping to ensure flux cancellation, which minimizes radiated emissions and prevents crosstalk between traces.
Controls EMI internal to the PCB by reducing the injection of common- mode current into the power distribution system. An RF modulating plane will propagate RF currents throughout the entire assembly causing disruption to all components sharing that voltage rail. Use 0. Summary - Guidelines for Power Distribution Networks 1. Determine board impedance requirements.
To maximize total, plane impedance must be held below a maximum level.
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Calculate this value by estimating maximum current required by active devices and dividing that value into the maximum noise margin that can be tolerated. Establish total amount of capacitance required. More capacitance results in lower power bus impedance. Table of Contents Preface. EMC Fundamentals. Components and EMC. Image Planes. Bypassing and Decoupling.
Transmission Lines. Signal Integrity and Crosstalk.
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