RM912 Datasheet, PDF (1/20 Pages) Conexant Systems, Inc – CDMA/AMPS 3-4 Volt Power Amplifier (824-849 MHz)

RM912
CDMA/AMPS 3–4 Volt Power Amplifier (824–849 MHz)
The RM912 dual mode Code Division Multiple Access (CDMA)/Advanced Mobile
Distinguishing Features
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. ^{• Low voltage positive bias supply}
This device meets stringent IS95 CDMA linearity requirements to beyond 28 dBm ^{• Good linearity}
output power and can be driven to power output levels beyond 31 dBm for high
• High efficiency
efficiency FM mode operation. A single GaAs Microwave Monolithic Intergrated
• Dual mode operation
Circuit (MMIC) contains all active circuitry in the module. The MMIC contains
• Large dynamic range
on-board bias circuitry, as well as input and interstage matching circuits. The output
•
6-pin LCC package
(6 x 6 x 1.5 mm)
match is realized off-chip within the module package to optimize efficiency and power _{• Power down control}
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 _Applications
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 ^{• Digital cellular (CDMA)}
output in the 3-4 volt range. Power down is accomplished by setting the voltage on ^{• Analog cellular (AMPS)}
the low current reference pin to zero volts. No external supply side switch is needed ^{• Wireless local loop}
as typical “off” leakage is a few microamperes with full primary voltage supplied from
the battery.
Functional Block Diagram
VREF
(3)
VCC1
(1)
VCC2
(4)
RF
Input
(2)
Driver
Stage Bias
Power
Stage Bias
Input
Match
DA
Inter
Stage
PA
Match
MMIC
Output
Match
RF
Output
(5)
GND
(6, 7)
GND
(6, 7)
MODULE
Data Sheet
 2000, Conexant Systems, Inc. All Rights Reserved.
100635G
August 2000