RM912
CDMA/AMPS 3–4 Volt Power Amplifier (824–849 MHz)
The RM912 dual mode Code Division Multiple Access (CDMA)/Advanced Mobile
Phone Service (AMPS) Power Amplifier is a fully matched 6-pin LCC surface mount
module designed for mobile units operating in the 824-849 MHz cellular bandwidth.
This device meets stringent IS95 CDMA linearity requirements to beyond 28 dBm
output power and can be driven to power output levels beyond 31 dBm for high
efficiency FM mode operation. A single GaAs Microwave Monolithic Intergrated
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
Ω
load. This device is manufactured with Conexant’s GaAs HBT
process that provides for all positive voltage DC supply operation while maintaining
high efficiency and good linearity. Primary bias to the RM912 can be supplied directly
from a three cell nickel-cadmium, single cell lithium-ion, or other suitable battery with
output in the 3-4 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 “off” leakage is a few microamperes with full primary voltage supplied from
the battery.
Distinguishing Features
•
•
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•
•
•
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Low voltage positive bias supply
Good linearity
High efficiency
Dual mode operation
Large dynamic range
6-pin LCC package
(6 x 6 x 1.5 mm)
Power down control
Applications
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Digital cellular (CDMA)
Analog cellular (AMPS)
Wireless local loop
Functional Block Diagram
VREF
(3)
VCC1
(1)
VCC2
(4)
Driver
Stage Bias
Power
Stage Bias
RF
Input
(2)
Input
Match
DA
Inter
Stage
Match
MMIC
PA
Output
Match
RF
Output
(5)
MODULE
GND
(6, 7)
GND
(6, 7)
Data Sheet
2000, Conexant Systems, Inc. All Rights Reserved.
100635G
August 2000
CONEXANT [ CONEXANT SYSTEMS, INC ]
