鈥?/div>
Wireless Local Loop (WLL)
Description
The SKY77148 Power Amplifier Module (PAM) is a fully matched 7-pin surface mount module
developed for Code Division Multiple Access (CDMA2000) handset and Wireless Local Loop
applications. This small and efficient power amplifier packs full coverage of the 450鈥?60 MHz
bandwidth into a single compact package. The device meets the stringent CDMA2000 linearity
requirements to and exceeding 29 dBm output power. A low current pin (VCONT) provides improved
efficiency for the low RF power range of operation.
The single Gallium Arsenide (GaAs) Microwave Monolithic Integrated Circuit (MMIC) contains all active
circuitry within the module, which includes on-board bias circuitry as well as input and interstage
matching circuits. Output match into a 50
鈩?/div>
load is realized off-chip within the module package to
optimize efficiency and power performance. This device is manufactured with Skyworks鈥?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 SKY77148 is
supplied directly from a three-cell Ni-Cd, a single-cell Li-Ion, or other suitable battery with a rated
output in the 3.2 to 4.2 volt range. Setting the voltage on the low current reference pin to zero volts
accomplishes power down. No external supply side switch is needed as typical 鈥渙ff鈥?leakage is a few
microamperes with full primary voltage from the battery.
Features
鈥?/div>
Low voltage positive bias
supply
- (3.2 V to 4.2 V)
鈥?/div>
Good linearity
鈥?/div>
High efficiency across wide
dynamic range
鈥?/div>
Dual-mode operation
鈥?/div>
7-pin package
- 6 mm x 6 mm x 1.5 mm
鈥?/div>
Power down control
鈥?/div>
Low power state control
鈥?/div>
CDMA2000
Skyworks offers lead
(Pb)-free "environmentally
friendly" packaging
that is RoHS compliant
(European Parliament
for the Restriction of
Hazardous Substances).
VCC2 (5)
VREF (3)
VCONT (4)
Driver
Stage Bias
VCC1 (1)
RF IN (2)
GND (7)
Input Match
DA
InterStage
Match
Power
Stage Bias
MMIC
MODULE
PA
Output Match
(6) RF OUT
103018_001
Figure 1. Functional Block Diagram
Skyworks Solutions, Inc. 鈥?Phone [781] 376-3000 鈥?Fax [781] 376-3100 鈥?sales@skyworksinc.com 鈥?www.skyworksinc.com
103018B 鈥?Skyworks Proprietary Information 鈥?Products and Product Information are Subject to Change Without Notice. 鈥?May 12, 2006
1
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