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The design highlight of a power amplifier (PA) for 3G and beyond handset applications is to maximize its power-added efficiency (PAE) with specified linearity requirement at both peak and back-off power levels. In addition to PAE, its cost and size are of very important design considerations among others. The design principle of a linear PA with good PAE is summarized. An overview of different GaAs...
Directional couplers are used for output power detection and control in both WCDMA and GSM/EDGE power amplifier (PA) front end modules (FEM). At high values of load VSWR, delivered power shows significant variations with the phase. Back-of-envelope calculations are used to estimate output power variations. The objective of this analysis is to define a unified platform for understanding the power control...
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 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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