鈥?/div>
Wireless local loop (WLL)
The SKY77149 System Smart鈩?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 Power Amplifier packs full 1850鈥?910 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 (VCONT) pin 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
鈩?/div>
load. 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 SKY77149 is supplied directly from a three-cell nickel
cadmium, a single-cell lithium ion, or other suitable battery with an output in the 3 to 4 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 鈥渙ff鈥?leakage is a few
microamperes with full primary voltage supplied from the battery.
Features
鈥?/div>
Low voltage positive bias supply
-
3.2 V to 4.2 V
鈥?/div>
Low VREF
-
2.85 V, nominal
鈥?/div>
Low IREF
-
less than 1 mA
鈥?/div>
Good linearity
鈥?/div>
High efficiency
鈥?/div>
Large dynamic range
鈥?/div>
8-pin package
-
3 x 3 x 1.2 mm
鈥?/div>
Power down control
鈥?/div>
Dynamic bias control
鈥?/div>
InGaP
鈥?/div>
IS95/CDMA2000/EVDO
鈥?/div>
Full U.S. PCS coverage
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
103078P3 鈥?Skyworks Proprietary and Confidential information. 鈥?Products and product information are subject to change without notice. 鈥?May 14, 2004
1
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