DATA SHEET
SKY77149 PA Module for CDMA / PCS (1850–1910 MHz)
Applications
•
Personal Communications
Services (PCS)
•
Wireless Local Loop (WLL)
The SKY77149 System Smart™ Power Amplifier Module (PAM) is a fully matched 8-pin surface
mount module developed for Code Division Multiple Access (CDMA) / Personal Communications
Service (PCS) and Wireless Local Loop (WLL) applications. This small and efficient module packs full
1850–1910 MHz bandwidth coverage into a single compact package. The SKY77149 meets the
stringent spectral linearity requirements of Code Division Multiple Access (CDMA) PCS transmission,
with high power added efficiency for power output of up to 28 dBm. A low current pin (VCONT) is
provided to improve efficiency for the low RF power range of 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. The output match is realized off-chip within the module package to optimize
efficiency and power performance into a 50-ohm load. This device 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 SKY77149 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.
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 1.2 mm
•
Power down control
•
Dynamic bias control
•
InGaP
•
IS95/CDMA2000/EVDO
•
Full U.S. PCS coverage
MODULE
VREF (1)
MMIC
Skyworks offers lead
(Pb)-free "environmentally
friendly" packaging
that is RoHS compliant
(European Parliament
for the Restriction of
Hazardous Substances).
VCONT (2)
VCC2 (5)
Driver
Stage Bias
VCC1 (4)
RF_IN (3)
GND (7, 8)
Input
Match
DA
Inter-Stage
Match
PA
Output
Match
(6) RF_OUT
Power
Stage Bias
103062_001
Figure 1. Functional Block Diagram
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
103062B • Skyworks Proprietary and Confidential Information. • Products and product information are subject to change without notice. • November 6, 2006
1
SKYWORKS [ SKYWORKS SOLUTIONS INC. ]
