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PRELIMINARY PRODUCT SUMMARY
SKY77173 AutoSmart™ Power Amplifier Module for WCDMA
(1920–1980 MHz)
Applications
• WCDMA handsets
Features
• Low voltage positive bias
• Low VREF
• Low IREF
• Good linearity
• High efficiency
• Large dynamic range
• 8-pin package
• Power down control
• InGaP
• Supports low collector
supply
- 3.2 V to 4.2 V
- 2.85 V, nominal
- less than 1 mA
- 3 x 3 x 1.15 mm
voltage operation
Skyworks offers lead
(Pb)-free "environmentally
friendly" packaging
that is RoHS compliant
(European Parliament
for the Restriction of
Hazardous Substances).
200646P1 • Skyworks Proprietary and Confidential Information. • Products and product information are subject to change without notice. • October 24, 2005
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
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.
AutoSmart
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.
GND (7,8)
VCC (4,5)
VBIAS (2)
RF_IN (3)
VREF (1)
TM
power amplifier technology internally adjusts the RF transistor bias level throughout the
Stage Bias
Match
Driver
Input
Control Circuit
Figure 1. Functional Block Diagram
Feedback
DA
Inter-Stage
Stage Bias
Match
Power
PA
MODULE
Output
Match
RF_OUT (6)
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