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ADI PA module employs closed-loop output measurement

Posted: 27 Mar 2003 ?? ?Print Version ?Bookmark and Share

Keywords:analog devices? adl5551? rf power amplifier? rf pa module? power amplifier module?

The ADL5551 RF power amplifier module is claimed by Analog Devices Inc. (ADI) to be the industry's first PA module with integrated power control using closed-loop output measurement to extend battery life and improve performance in cellphones.

The device is the first product of the company's recently announced X-PA family of RF PA modules and employs GaAs HBT PA process technology. The closed-loop architecture results to battery power savings of >20 percent, compared to products that use the open-loop voltage and current sensing approaches.

The output power control approach directly measures actual output power instead of indirectly controlling it by measuring supply voltage and current. ADI claims it to be the most accurate method in poor VSWR situation, resulting to improved specific absorption ration (SAR) ratings and handset performance. The ADL5551 also requires one ramping profile for all power levels to meet GSM mask specifications, unlike voltage and current sense methods, which require multiple ramp profiles.

Available in a 10-by-10-by-1.4mm LCC package, the IC operates from a 2.9V to 4.5V power supply and is quad-band GSM and GPRS-compliant to level 12.

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