WCDMA_Power_Supply_DramaticallyW-CDMA Power Supply Dramatically Improves Transmit EfficiencyPOWER-SUPPLY CIRCUITSMar 01, 2001APPLICATION NOTE 1205W-CDMA Power Supply Dramatically Improves Transmit EfficiencyThe 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……