RMCEMC Jan 2003
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Our last meeting was.. Power Distribution System Decoupling - How 'bout them vias?
Presentation Download(~2MB) Special thanks to our sponsor: Ansoft Corporation
Presenter: T.J. (Bill) Ritenour (Bio) Date : January 23 2003 What we saw: The Power Distribution System of a Printed Circuit Board is a vital if unglamorous component in the struggle to maximize signal integrity while simultaneously minimizing radiated emissions. As circuit speeds increase, faster signal edges cause larger and larger consequential Simultaneous Switching Noise (SSN). This is due to the faster current transitions that must flow through the Power Distribution System (PDS) and on to the logic devices that draw power from it. The PDS–logic device paths are inherently inductive, and in a typical PWB significant levels of Ldi/dt noise will abound. For example, from the prospective of an output buffer, the PDS has three critical components: 1) the buffer’s decoupling capacitors, 2) the inductance of the paths between them and the buffer, and 3) the PDS power and ground plane impedances. As switching speeds decrease, minimization of inductance is paramount if emission noise is to remain below the maximum level allowed by the national and international standards. This talk covered some of the basic elements of the PDS power and ground planes before focusing on vias, decoupling capacitors, pad layouts and the equivalent inductance of the decoupling current paths. Inductance minimization methodologies applied to oscillator and logic circuits were presented. Speaker (Bio). Thurman (Bill) Ritenour received his Bachelor of Science in Electrical Engineering at the University of Texas (Austin) in 1963 and worked in the Aerospace Industry until 1980, principally in Power Supply design, Electronic Counter-Measures and Radio Navigation. Since 1980 Mr. Ritenour has specialized in Electromagnetic Compatibility (EMC) and in early 1995 established his own consulting company EMC Compliance LLC . in Boulder, Colorado. Over the past twenty years his practice has extended over a wide range of equipment, among them are: industrial process control systems, small computer peripherals, medical systems, large scale information storage and retrieval systems, large scale computer systems, airborne military and commercial carrier equipment, as well as other electronic equipment families. Mr. Ritenour has served or is serving on several ANSI committees: ESD (one of the co-authors of C63.16, ANSI ESD Test Guideline released in 1993), Medical EMC and others; serves as the liaison between the ESD Association and the IEEE EMC Society; serves on the IEEE EMC Society Standards Committee, served on the IEEE EMC Society’s Board of Directors (1994-97), and was an EMC Society Distinguished Lecturer from 1997 through 1999. Mr. Ritenour has written articles on EMC topics in various symposia records and periodicals. He holds one patent (1996) in EMC.
Cost: Free. This meeting is open to all interested parties. You do not need to be an IEEE member to attend. However we encourage you join the IEEE EMC Society to help sponsor meetings such as these. If
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![[Click to enlarge]](tn_BillEngagesTheAudience.jpg) |
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