WCDMA_Power_Supply_Dramaticall...

WCDMA_Power_Supply_DramaticallyW-CDMA Power Supply Dramatically Improves Transmit Efficiency

POWER-SUPPLY CIRCUITS

Mar 01, 2001

APPLICATION NOTE 1205

W-CDMA Power Supply Dramatically Improves Transmit Efficiency
The MAX1820 switch-mode power supply is optimized to improve the transmit efficiency in WCDMA handsets. By dynamically reducing the Vcc headroom in the power amplifier (PA), the battery current is dramatically reduced at all power levels below maximum transmit power. The design of the MAX1820 has been solely optimized for this application. As the planned introduction of 3rd-generation (3G) cellular phones approaches, handset designers have been busy developing new solutions to accommodate the demands of high-speed data transmission. Among the greatest of these demands are software, screen technology, datapro