Project Wireless - February 2009 - (Page 9) Feature PrOjeCT By Jeff Ju and Gerald Johnston | Fairchild Semiconductor | South Portland, ME | http://www.fairchildsemi.com pplication-specific signal path products are finding more and more relevance in 3g and feature/smart phone applications where higher-throughput video and usB data dominate. several unique solutions illustrate this need and this article will offer suggestions that can shorten design time. a Contents viewpoint Smart integration design Signal Paths in 3G and Feature / Smart Phone Apps Antennas for Handheld devices uSb charger oVp complIance and plug-In deTecTIon With the market moving to a single usB connector for both charger and data connections, there is strong potential for application-specific usB devices that not only focus on charger detection, but also offer excellent signal integrity. the new chinese usB charger standard requires over-voltage protection of 6 v for the vBus charger input. it calls for a device to be able to detect both this vBus input ovp threshold and undervoltage conditions. in such applications, the chargerdetect function can find a short-circuit Home Page Product Training Module Online Ordering Suppliers Catalog | vOLuMe 1 | nuMber 1 Circuit requirements are unique in portable charger and data cable applications SIgnal PathS In 3g anD feature/Smart Phone aPPS 9 http://www.fairchildsemi.com http://ad.doubleclick.net/clk;211088645;32661511;z?http://www.digikey.com http://ad.doubleclick.net/clk;211088645;32661511;z?http://www.digikey.com http://ad.doubleclick.net/clk;211088750;32661511;w?http://digikey.com/PTM/PTMMaster.page?site=us&lang=en http://ad.doubleclick.net/clk;211088807;32661511;z?http://ordering.digikey.com/ordering/addpart.aspx?site=US&source=search http://ad.doubleclick.net/clk;211088983;32661511;e?http://digikey.com/Suppliers/SupplierIndex.page?site=us&lang=en http://ad.doubleclick.net/clk;211091911;32661511;p?http://dkc1.digikey.com/us/en/pdf/Current.html
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