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Improving RF Transmission EfciencyTiny RF PA Power Management ICOUTPUT VOLTAGE (V)4.54.03.53.02.52.01.51.00.5DC/DC Output Voltagevs. DAC VoltageV IN= 4.2VI OUT= 100mAV OUT= V DACx 3Bypass ModeDACEN1EN2MIC28082.0mm x 2.5mmRF PAPower SupplyRF TransceiverPA Reference00.1 0.3 0.5 0.7 0.9 1.1 1.3 1.5DAC VOLTAGE (V)RF Power amplifiers used in cell phoneapplications are typically powered directly from thebattery. This creates a challenge for the designers:as RF devices, the power amplifier adjusts thevoltage and current based on the transmission.Inefficiencies are created when the PA supplyvoltage and the output voltage are different.The MIC2808’s DAC controlled adjustable voltageoutput feature minimizes the input to outputvoltage differential, thus improving efficiency andbattery life. The voltage is adjusted based on realtimeneeds of the PA to achieve the most efficientoperation at any given transmit power level.For more information, contact your local Micrelsales representative or visit Micrel at: www.micrel.com/ad/mic2808.Ideal for use in: CDMA2000 mobile phones UMTS/WCDMA mobile phones Power amplier modules (PAMs) with linear PAs WiMAX/Wibro modules WiFi modules DECT handsets© 2010 Micrel, Inc. All rights reserved.Micrel and Innovation Through Technology are registered trademarks of Micrel, Inc.www.micrel.com
contents2.3.11Simpler PowerConversion5254IR’s SmartRectifier chipsetfor AC-DC power convertersdramatically simplifies designand improves efficiency.DEPARTMENTS & COLUMNS10 EDN.comment: The design-to-cost imperative and customer value17 Signal Integrity: Take the fifth50 Supply Chain: A new twist on design chain:EBV collaborates to launch chips52 Product Roundup: Passives54 Tales from the Cube: Tower of babbleonline contentsONLINE ONLYCheck out these Web-exclusive articles:Photovoltaic market to see sunny 2011Photovoltaic solar installations are expectedto rise in 2011, but rollbacks in other countriesadd clouds to iSuppli’s positive outlook.➔www.edn.com/110203tocaEnergy Star turning into black hole,technology companies fearAlthough IT manufacturers have long supportedand would like to continue supportingEnergy Star, additional time and moneyrequirements may drive some companies outof the program.➔www.edn.com/110203tocbHOT 100EDN proudly presents its list of the Hot100 products that in 2010 heatedup the electronics world andgrabbed the attention of oureditors and our readers.➔www.edn.com/110203toccwww.edn.comWANTED: Design IdeasR 184 +180kμFD 11N4148R 17 R 190k 100kR 206.8kD 283+ IC 42 LM358–41Want to see yourwork featuredin EDN? Submityour own DesignIdea—a short,compact article that helps solve problemsor shows innovative ways to accomplishdesign tasks. We review articles that fallinto virtually any technology area: analogor digital circuits, programmable logic,hardware-design languages, systems,programming tips, useful utilities, testtechniques, and so on. The idea should beuseful, innovative, or tricky. And if we acceptyour Design Idea, we pay you $150.To learn what makes a good DesignIdea entry, spend some time browsingour archive of Design Ideas at www.edn.com/designideas. For information onhow to submit a Design Idea, see theDesign Ideas Writers’ Guide: www.edn.com/110203tocd.SmartRectifier ICsPartNumberPackageIR1166SPBFIR1167A IR1167B IR1168 IR11662 IR11672A IR11682SPbF SPbF SPbF SPbF SPbF SPbFSO-8V CC(V) 20V FET(V) 200Sw Freq.max (kHz)500 400Gate Drive+1/-4±(A)+2/-7 +1/-4 +1/-4 +2/-7 +1/-4V GATEClamp (V)10.7 10.7 14.5 10.7 10.7 10.7 10.7Min. OnTime (ns)Program. 250 -3000 750 Program. 250 -3000 850Enable Pin Yes Yes Yes No Yes Yes NoChannel 1 2 1 2AutomaticMOTProtectionNo No No No Yes Yes YesFor more information call1.800.981.8699 or visitwww.irf.comEDN® (ISSN#0012-7515) is published semimonthly, 24 times per year, by UBM Electronics, 11444 W. Olympic Blvd., Los Angeles, CA 90064-1549; 310/445-4200; FAX 310/445-4299. Periodicals postage paid at Los Angeles, CA, and at additional mailing offices. SUBSCRIPTIONS—Free to qualified subscribers as defined on the subscription card. Rates for nonqualified subscriptions, including all issues: US, $150 one year;$250 two years; $300 three years. Except for special issues where price changes are indicated, single copies are available for $10 US and $15foreign. For telephone inquiries regarding subscriptions, call 763/746-2792. E-mail: EDN@kmpsgroup.com. CHANGE <strong>OF</strong> ADDRESS—Noticesshould be sent promptly to PO Box 47461, Plymouth, MN 55447. Please provide old mailing label as well as new address. Allow two monthsfor change. NOTICE—Every precaution is taken to ensure accuracy of content; however, the publisher cannot accept responsibility for the correctnessof the information supplied or advertised or for any opinion expressed herein. POSTMASTER—Send address changes to EDN, POBox 47461, Plymouth, MN 55447. Canada Post: Publications Mail Agreement 40612608. Return undeliverable Canadian addresses to PitneyBowes Inc, PO Box 25542, London, ON N6C 6B2. Copyright 2011 by United Business Media. All rights reserved. Reproduction in whole orpart without written permission is prohibited. Volume 56, Number 3 (Printed in USA).<strong>THE</strong> POWER MANAGEMENT LEADERVisit us at Booth 409Fort Worth Convention Center07-09 March 2011
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Page 11 and 12: ASSOCIATE PUBLISHER,EDN WORLDWIDEJu
Page 13 and 14: Analog Devices: enabling the design
Page 15 and 16: Class D amplifier suppresses EMISil
Page 17 and 18: SIGNAL INTEGRITYBY HOWARD JOHNSON,
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Page 23 and 24: CLOCKRESETCONFIGURATIONSERIALBOOTLO
Page 25 and 26: EXTERNALNAND MEMORYOPERATING-SYSTEM
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