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Because PAs used in cell phone handsets operate with a battery supply, a high PAE is essential for battery life. It is also important for thermal management on the handset. Linearity is critical for 3G applications or beyond. In addition, cost, size, and reliability are also very important to consider. Higher and higher on-chip integration using various semiconductor technologies is the key to make...
This paper presents a new balanced architecture to improve the power added efficiency (PAE) of a 3G handset power amplifier without trading-off its stringent linearity requirement. It is modified from the structure of our switched load insensitive power amplifier (LIPA). Power amplifiers using this modified balanced structure retain the main features of the LIPA and provide boosted PAE performance...
A novel load insensitive power amplifier (LIPA) with balanced structure is developed for 3G (HSDPA and HSUPA) handset application at PCS band from 1850-1910 MHz. No external regulated voltage and analog voltage supplies are required at high power level and it is compatible with DC-to-DC converters. Digital or analog control may be applied to further improve its PAE at low and middle power levels....
A compact handset front-end module (FEM) is developed for the third generation wide band CDMA application in PCS band. This module uses Skyworks' switched load insensitive power amplifier (LIPAreg) technology. It operates at high and low power modes for good PAE and linearity. The low mode PAE is enhanced using analog bias control circuit. The FEM is optimized for low output power variation under...
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