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Wireless Local Loop (WLL)
Description
The CX77112 Power Amplifier Module (PAM) is a fully matched 10-pin surface mount
module developed for 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 CX77112 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 29 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. 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 CX77112 is supplied directly from a three-cell Ni-Cd, a
single-cell Li-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
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Low voltage positive bias supply
- 3.2 V to 4.2 V
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Low VREF
- 2.85 V, nominal
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Good linearity
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High efficiency
鈥?/div>
Large dynamic range
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10-pin package
- 4 mm x 4 mm x 1.5 mm
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Power down control
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Low power-state control
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InGaP
鈥?/div>
IS95/CDMA2000
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Full U.S. PCS coverage
VREF
(4)
VCC1
(1)
VCONT
(5)
VCC2
(10)
Driver
Stage Bias
Power
Stage Bias
RF IN (2)
Input
Match
DA
Inter
Stage
Match
PA
Output
Match
(8) RF OUT
MMIC
MODULE
(3, 6, 7, 9)
GND
(3, 6, 7, 9)
GND
101904_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
101904D 鈥?Skyworks Proprietary and Confidential Information. 鈥?Products and product information are subject to change without notice. 鈥?November 25, 2003
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