SKY77447 Datasheet, PDF (1/2 Pages) Skyworks Solutions Inc. – Low voltage positive bias supply - 3.0 V to 4.6 V

PRODUCT SUMMARY
SKY77447 LIPA^® Module for WCDMA / HSDPA / HSUPA /
HSPA+ Band II (1850–1910 MHz)
Applications
• WCDMA handsets
Features
• Low voltage positive bias
supply
- 3.0 V to 4.6 V
• Good linearity
• High efficiency at all power
levels
- 19% @ 15 dBm
• Large dynamic range
• Small, low profile package
- 4 mm x 3 mm x 0.9 mm
- 10-pad configuration
• Power down control
• InGaP
• Supports low collector
voltage operation
• Digital VEN
• No VREF required
• Digital or analog control
• Integrated Directional
Coupler
The SKY77447 Load-Insensitive Power Amplifier (LIPA^®) module is a fully matched 10-pad surface
mount module developed for Wideband Code Division Multiple Access (WCDMA) applications. This
small and efficient module packs full 1850–1910 MHz bandwidth coverage into a single compact
package. Because of high efficiencies attained throughout the entire power range, the SKY77447
delivers unsurpassed talk-time advantages. The SKY77447 meets the stringent spectral linearity
requirements of High Speed Downlink Packet Access (HSDPA) data transmission with high power
added efficiency. A directional coupler integrated into the module eliminates the need for any external
coupler.
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 SKY77447 operates as a load-insensitive power amplifier providing high linearity in the presence
of high RF mismatch up to 3:1 VSWR. The module is manufactured with Skyworks’ InGaP GaAs
Heterojunction Bipolar Transistor (HBT) BiFET process that provides for all positive voltage DC supply
operation while maintaining high efficiency and good linearity. No VREF voltage is required. Power
down is accomplished by setting the voltage on VEN 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.
Figure 1. SKY77447 Functional Block Diagram
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [e-mail] • www.skyworksinc.com
201507A • Skyworks Proprietary and Confidential Information. • Products and product information are subject to change without notice. • February 25, 2011
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