W. Michael King

W. Michael King is a systems design advisor who has been active in the development of over 1,000 system-product designs in a 50 year career. He serves an international client base as an independent design advisor. Many terms used for PC Board Layout, such as the “3-W Rule”, the “V-plane Undercut Rule”, and “ground stitching nulls”, were all originated by himself. His full biography may be seen through his web site: www.SystemsEMC.com. Significantly, he is the author of EMCT: High Speed Design Tutorial (ISBN 0-7381-3340-X) which is the source of some of the graphics used in this presentation. EMCT is available through Elliott Laboratories/NTS, co-branded with the IEEE Standards Information Network.

From This Author

Myth vs. Reality

Myth vs. Reality: The Performance of Shields

The myth: The representation of shield performance (in dB) as applied to products will...

Columns

Myth vs. Reality: Common-Mode Field Transfer – Coupling Between Circuit Boards and Conductive Chassis Structures

This document discusses the myth that digital circuit boards can be isolated from conductive chassis structures, explaining the reality that they are always coupled through distributed capacitance and transmission line effects.

Testing

Systems Response to Electrostatic Discharge: Part 2

Through the referenced research efforts, it has been recognized that the spectral bandwidth of the ESD event, considered as a continuum, is highly dependent on the electrostatic initialization amplitudes that are evident immediately prior to the displacement of the stored energy through the ESD event.

Testing

Systems Response to Electrostatic Discharge: Part 1

This paper discusses the application of ESP impulse waveform research results toward understanding the ESD amplitude-waveform dependency of susceptibility responses from systems products and outlines the conceptual aspects of the test methodology required for thorough product evaluation.

Design

Digital “Noise” Common-mode Coupling Mechanisms in the Z-Axis

The development of “digital common-mode noise” within circuit devices and subsequently within circuit boards is initially formed by peak over-shoot and under-shoot currents in the power and return planes. The peak currents are attributable to the “cross-conduction” transitions in circuit devices, where the driver literally segments turning “on” before the pull-down drivers turn “off”.

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