SKY77171 Datasheet, PDF (1/9 Pages) Skyworks Solutions Inc. – AutoSmart™ Power Amplifier Module for WCDMA (1920-1980 MHz)

PRELIMINARY DATA SHEET
SKY77171 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
• Supports low collector
voltage operation
• Good linearity
• High efficiency
• Large dynamic range
• 10-pad package
- 4 x 4 x 1.15 mm
• Power down control
• InGaP
Description
The SKY77171 AutoSmart™ Power Amplifier Module (PAM) is a fully matched 10-pad 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
SKY77171 meets the stringent spectral linearity requirements of WCDMA transmission with high
power added efficiency for power output of up to 28 dBm.
AutoSmart^TM 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 SKY77171 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 SKY77171 is supplied directly from a three-cell
nickel cadmium, a single-cell lithium 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.
Skyworks offers lead
(Pb)-free "environmentally
friendly" packaging
that is RoHS compliant
(European Parliament
for the Restriction of
Hazardous Substances).
VCC (10)
VREF (5)
VCC (1)
RF_IN (2)
GND
(3,6,7,9)
Driver
Stage Bias
Input
Match
MODULE
Feedback
Control Circuit
Power
Stage Bias
DA
Inter-Stage
Match
PA
Output
Match
(8) RF_OUT
Figure 1. Functional Block Diagram
200014_001
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [e-mail] • www.skyworksinc.com
200014P2 • Skyworks Proprietary and Confidential information. • Products and product information are subject to change without notice. • October 14, 2005
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