Axiom’s Family of GSM/GPRS Quad band CMOS Power Amplifiers
Axiom Microdevices’ patented technology, deployed in the AX502 and AX508, allows the use of 0.13um
Silicon CMOS process technology to integrate all of the functions between transmitter output and
transmit/receive switch. The power gain stages, small signal control circuitry and 50O matching are
all realized on a single die.
The AX502 and AX508 PAs amplify low-level radio frequency (RF) signals to the required high-power levels
needed for transmission in GSM/GPRS mobile phone handsets or data modules. The device supports quad-band
(GSM 850/900/1800/1900) operation. The integrated 50O input and output matching circuitry, enables direct
connection to the transceiver output and the transmit/receive switch input without the use of the external
matching components. The power level is regulated via a fully integrated closed-loop power controller which
ensures that the GSM power/time mask and switching spectrum may be met with adequate margin to allow robust
mass production when subjected to a real world cell phone environment, such as highly elevated VSWR and low
supply voltage.
The reliability of Axiom’s GSM/GPRS quad band CMOS power amplifiers has been proven through thousands
of hours of life testing, at accelerated operating conditions, including greater than recommended operating
temperature, extended duty cycle, load mismatches of greater than VSWR 10:1 at worst case phase angles, and
elevated supply voltages.
As of December 2008, Axiom has shipped over 25 million units of its AX502 Silicon CMOS power amplifier.
Also included in the feature set of Axiom’s GSM/GPRS quad band CMOS power amplifiers:
- GSM/GPRS Class 12 operation
- Power supply range of 2.9-5.5V
- RF input range: -2 to 8dBm
- Fully integrated on chip 50O matching circuits
- Fully integrated closed-loop power control
- <100 dB/V Power Control Slope
- MSL JEDEC Level 2a, lead-free (Pb), RoHS compliant package
- Low Profile 5x5x0.9mm (AX502) or 5x3.5x0.9mm (AX508) Micro Lead Frame package
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