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Electronic Design THE AUTHORITY ON EMERGING TECHNOLOGIES FOR DESIGN SOLUTIONS SEPTEMBER/OCTOBER 2019 electronicdesign.com AUTOSAR Exploits Multicore SoCs p34 $10.00 Blue Chip PerformersPerformers Exceptionally high Q, low DCR and a wide range of inductance values make our wirewound chip inductors a sure bet! Engineers love our high-performance, Our 0402DC and 0805HP Series provide low-cost, wirewound ceramic chip inductors; the industry’s highest Q factors in their considered by most to be the best perform- respective sizes for super low loss in high ing wirewounds available. frequency circuits. And the 0402DC Series For example, our 0201HL Series is offered offers 112 values from 0.8 to 120 nH, includ- in seven inductance values ranging from ing 0.1 nH increments from 2.8 to 10 nH. 22 to 51 nH – the highest currently offered Find out why our customers are so in an 0201 (0603) package – making them bullish on our wirewound ceramic chip ideal for impedance matching in 700 MHz inductors. Order your free samples today at band LTE and 5G applications. www.coilcraft.com. ® WWW.COILCRAFT.COM SEPTEMBER/OCTOBER 2019 VOLUME 67, ISSUE 5 IN THIS ISSUE FEATURES 18 Redesign Overvoltage Protection to Bolster Reliability and Safety Different circuit-protection technologies are used to overcome MOV limitations in certain harsh environments. A novel hybrid approach ups the reliability and safety ante to meet application demands. 18 24 Debugging Starts with Code Quality Save time on your projects by using coding standards and static analysis to help improve your code quality in the beginning, so you spend less time debugging at the end. 24 30 Attacking the Memory Bottleneck Is it time to go serial for the memory interface in servers? Microchip and IBM think so. 34 Unleash Multicore Processor Performance in Automotive Architectures Software must be parallelized and modifi ed to benefi t from new approaches to enhance hardware performance. AUTOSAR’s layered software architecture leverages MCUs to meet the latest demands. 34 38 What’s the Difference Between Conventional and Planar Switching Power Transformers? Escalation in the use of higher frequencies for today’s power-conversion applications has designers increasingly looking at planar magnetics devices over traditional transformers. 41 What’s All This Pease Prototype Stuff, Anyhow? Digging through boxes of the prototype circuits that Bob Pease had amassed over the years proved to be a fun time for all involved. COLUMNS & DEPARTMENTS 4 ON ELECTRONICDESIGN.COM 8 EDITORIAL 10 NEWS & ANALYSIS 47 CLASSIFIEDS 47 AD INDEX 48 LAB BENCH 41 Wearable Clinical-Grade Medical Sensors Get Even Smaller EDITORIAL MISSION: To provide the most current, accurate, and in-depth technical coverage of the key emerging technologies that engineers need to design tomorrow’s products today. ELECTRONIC DESIGN (ISSN 0013-4872) is published bi-monthly in Jan/Feb, Mar/Apr, May/June, July/Aug, Sept/Oct Permission is granted to users registered with the Copyright Clearance Center Inc. (CCC) to and Nov/Dec by Informa Media Inc., 9800 Metcalf Ave., Overland Park, KS 66212-2216. Paid rates for a one-year photocopy any article, with the exception of those for which separate copyright ownership subscription are as follows: $60 U.S., $90 Canada, $120 International. Periodicals postage paid at Kansas City, MO, is indicated on the first page of the article, provided that a base fee of $2 per copy of the and additional mailing offices. Editorial and advertising addresses: ELECTRONIC DESIGN, 605 Third Avenue, New article plus $1.00 per page is paid directly to the CCC, 222 Rosewood Drive, Danvers, MA York, NY 10158. Telephone (212) 204-4200. Printed in U.S.A. Title registered in U.S. Patent Office. Copyright© 2019 01923 (Code No. 0013-4872/94 $2.00 + $1.00). Copying done for other than personal by Informa Media Inc. All rights reserved. The contents of this publication may not be reproduced in whole or in part or internal reference use without the express permission of Informa Media, Inc. is prohib- without the consent of the copyright owner. For subscriber services or to order single copies, write to Electronic Design, ited. Requests for special permission or bulk orders should be addressed to the editor. PO Box 2100, Skokie, IL 60076. POSTMASTER: Send change of address to Electronic Design, PO Box 2100, Skokie, To purchase copies on microfilm, please contact National Archive Publishing Company IL 60076. Canadian GST #R126431964. (NAPC) at 732-302-6500 or 800-420-NAPC (6272) x6578 for further information. 2 SEPTEMBER/OCTOBER 2019 ELECTRONIC DESIGN ON ELECTRONICDESIGN.COM Is Raspberry Pi the Right Can 5G Really Live Up to Platform for Embedded Its Hype, and Why Should Product Development? You Care? T e Raspberry Pi was designed as a platform to teach computer As the electronics industry gears up for the eventual massive science to students. Given its low cost and wide availability, is it 5G rollout, questions abound regarding everything from suitable as a platform for commercial embedded products? small-cell infrastructure to available spectrum to handset development. https://www.electronicdesign.com/raspberry-pi-right-platform- embedded-product-development https://www.electronicdesign.com/industrial-automation/can-5g- really-live-its-hype-and-why-should-you-care Wood-Based 3D-Printed 11 Myths About USB Type-C Due to its popularity, a few myths have now emerged about the Sensors Include Wireless USB interface—particularly regarding its latest iteration, USB-C Access with PD. https://www.electronicdesign.com/industrial-automation/11-myths- Leveraging a previously developed technique, researchers about-usb-type-c developed sensors that are printed on cellulose and can be read wirelessly using a VNA. FOLLOW US ON FACEBOOK AND TWITTER https://www.electronicdesign.com/analog/wood-based-3d-printed- (ElectronicDesign) (@ElectronicDesgn) sensors-include-wireless-access 4 SEPTEMBER/OCTOBER 2019 ELECTRONIC DESIGN PUSH PERFORMANCE TO THE TOP PCB Terminal Blocks and Connectors for Power Electronics • Compact dimensions and high current carrying capacity – up to 85 A • Fast, easy connection with Push-in CAGE CLAMP® • Optimal handling for any application • Comprehensive range covering 24 - 4 AWG www.wago.us/powerelectronics SEPTEMBER/OCTOBER 2019 EDITORIAL GROUP CONTENT DIRECTOR: KAREN FIELD [email protected] SENIOR CONTENT DIRECTOR: BILL WONG [email protected] SENIOR STAFF WRITER: JAMES MORRA [email protected] TECHNICAL EDITOR: CHRIS DeMARTINO [email protected] CONTRIBUTING EDITOR: LOUIS E. FRENZEL [email protected] ASSOCIATE EDITOR/COMMUNITY MANAGER: ROGER ENGELKE [email protected] ART DEPARTMENT GROUP DESIGN DIRECTOR: ANTHONY VITOLO [email protected] CONTENT DESIGN SPECIALIST: JOCELYN HARTZOG [email protected] CONTENT & DESIGN PRODUCTION MANAGER: JULIE JANTZER-WARD [email protected] PRODUCTION GROUP PRODUCTION MANAGER: GREG ARAUJO [email protected] PRODUCTION MANAGER: SUSAN POSKIN [email protected] AUDIENCE MARKETING USER MARKETING MANAGER: DEBBIE BRADY [email protected] FREE SUBSCRIPTION / STATUS OF SUBSCRIPTION / ADDRESS CHANGE / MISSING BACK ISSUES OMEDA T | 847.513.6022 TOLL FREE | 866.505.7173 SALES & MARKETING MANAGING DIRECTOR: TRACY SMITH T | 913.967.1324 F | 913.514.6881 [email protected] REGIONAL SALES REPRESENTATIVES: AZ, NM, TX: GREGORY MONTGOMERY T | 480.254.5540 [email protected] AL, AR, SOUTHERN CA, CO, FL, GA, HI, IA, ID, IL, IN, KS, KY, LA, MI, MN, MO, MS, MT, NC, ND, NE, NV, OH, OK, SC, SD, TN, UT, VA, WI, WV, WY, CENTRAL CANADA: JAMIE ALLEN T | 415.608.1959 F | 913.514.3667 [email protected] CT, DE, MA, MD, ME, NH, NJ, NY, PA, RI, VT, EASTERN CANADA: ELIZABETH ELDRIDGE T | 917-789-3012 [email protected] AK, NORTHERN CA, OR, WA, WESTERN CANADA: STUART BOWEN T | 425.681.4395 [email protected] INTERNATIONAL SALES: GERMANY, AUSTRIA, SWITZERLAND: CHRISTIAN HOELSCHER T | 011.49.89.95002778 [email protected] BELGIUM, NETHERLANDS, LUXEMBURG, UNITED KINGDOM, SCANDINAVIA, FRANCE, SPAIN, PORTUGAL: JAMES RHOADES-BROWN T | +011 44 1932 564999 M | +011 44 1932 564998 [email protected] ITALY: DIEGO CASIRAGHI [email protected] PAN-ASIA: HELEN LAI T | 886 2-2727 7799 [email protected] PAN-ASIA: CHARLES LIU T | 886 2-2727 7799 [email protected] PLEASE SEND INSERTION ORDERS TO: [email protected] INFORMA REPRINTS: WRIGHT’S MEDIA T | 877.652.5295 LIST RENTALS/ SMARTREACH CLIENT SERVICES MANAGER: MARY RALICKI T | 212.204.4284 [email protected] DIGITAL GROUP DIGITAL DIRECTOR: RYAN MALEC [email protected] DESIGN ENGINEERING & SOURCING GROUP EXECUTIVE DIRECTOR, CONTENT: KAREN FIELD [email protected] VP OF MARKETING: JACQUIE NIEMIEC [email protected] INFORMA MEDIA INC. 605 THIRD AVENUE NEW YORK, NY 10158 USA T | 212.204.4200 Electronic Design | Machine Design | Microwaves & RF | Source ESB | Hydraulics & Pneumatics | Global Purchasing | Distribution Resource | Power Electronics | Defense Electronics 6 SEPTEMBER/OCTOBER 2019 ELECTRONIC DESIGN 10 MHz Distribution Amplifers • Sine wave outputs (+13dbm) • Amplitude leveling • Low additive phase noise • High channel-to-channel isolation • High return loss FS730 and FS735 series ... starting at $1250 (U.S. list) The FS730 and FS735 10 MHz distribution amplifers for other applications. Multiple units can be from SRS provide state-of-the-art solutions to daisy-chained for easy expansion. challenging signal distribution tasks. Please visit www.thinkSRS.com for details. These distribution amplifers use an input limiter design, which removes amplitude modulation from the signal, provides fxed amplitude outputs and blocks input noise. Virtually any 10 MHz waveform with a duty cycle near 50% may be used as an input. AGC based amplifers degrade broadband The FS735 model provides fourteen 10 MHz output noise. BNC connectors on the rear panel, with status indicators FS730/FS735 uses a limiter to remove on the front panel. The half-rack sized FS730 model spurs and maintain gives seven 10 MHz outputs and is available in both low noise.
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