PRELIMINARY PRODUCT SUMMARY SKY77173 AutoSmart™ Power Amplifier Module for WCDMA (1920–1980 MHz) Applications • WCDMA handsets Features • Low voltage positive bias supply - 3.2 V to 4.2 V • Low VREF - 2.85 V, nominal • Low IREF - less than 1 mA • Good linearity • High efficiency • Large dynamic range • 8-pin package - 3 x 3 x 1.15 mm • Power down control • InGaP • Supports low collector voltage operation Skyworks offers lead (Pb)-free "environmentally friendly" packaging that is RoHS compliant (European Parliament for the Restriction of Hazardous Substances). The SKY77173 AutoSmart™ Power Amplifier Module (PAM) is a fully matched 8-pin surface mount module developed for Wideband Code Division Multiple Access (WCDMA) handsets. This small and efficient module packs full 1920–1980 MHz bandwidth coverage into a single compact package. The SKY77173 meets the stringent spectral linearity requirements of WCDMA transmission with high power added efficiency for power output of up to 28 dBm. AutoSmartTM power amplifier technology internally adjusts the RF transistor bias level throughout the dynamic operating range to minimize battery current consumption and ensure sufficient linear performance to meet WCDMA system requirements. The result is a significant savings in average battery current without the complications of a system-supplied mode function signal or analog bias control. AutoSmart™ response time is more than adequate for RF access probe and discontinuous transmission operation. The single Gallium Arsenide (GaAs) Microwave Monolithic Integrated Circuit (MMIC) contains all active circuitry in the module. The MMIC contains on-board bias circuitry, as well as input and interstage matching circuits. Output match into a 50-ohm load is realized off-chip within the module package to optimize efficiency and power performance. The SKY77173 AutoSmart™ PAM is manufactured with Skyworks’ GaAs Heterojunction Bipolar Transistor (HBT) process that provides for all positive voltage DC supply operation while maintaining high efficiency and good linearity. Primary bias to the SKY77173 is supplied directly from a three-cell Ni-Cd, a single-cell Li-Ion, or other suitable battery with an output in the 3.2 to 4.2 volt range. Power down is accomplished by setting the voltage on the low current reference pin to zero volts. No external supply side switch is needed as typical “off” leakage is a few microamperes with full primary voltage supplied from the battery. MODULE VCC (4,5) VBIAS (2) VREF (1) Feedback Control Circuit Driver Stage Bias RF_IN (3) Input Match Power Stage Bias DA Inter-Stage Match PA Output Match RF_OUT (6) GND (7,8) 200464_001 Figure 1. Functional Block Diagram Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 200646P1 • Skyworks Proprietary and Confidential Information. • Products and product information are subject to change without notice. • October 24, 2005 1 Copyright © 2005, Skyworks Solutions, Inc. All Rights Reserved. Information in this document is provided in connection with Skyworks Solutions, Inc. (“Skyworks”) products. These materials are provided by Skyworks as a service to its customers and may be used for informational purposes only by the customer. Skyworks assumes no responsibility for errors or omissions in these materials. Skyworks may make changes to its documentation, products, specifications and product descriptions at any time, without notice. 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