Multilevel LINC System Designs for Power Efficiency Enhancement
Date Issued
2007
Date
2007
Author(s)
Chen, Yuan-Jyue
DOI
en-US
Abstract
Power amplifiers (PAs) are the most power-hungry devices in modern wireless communication systems. Designing a high linearity and high power efficiency wireless transmitter is a big challenge due to the nonlinear characteristic of the power amplifier. Various PA linearization techniques have been adopted to improve linearity and power efficiency of wireless transmitters.
Among them, the linear amplification with nonlinear components (LINC) technique can use high-efficiency nonlinear PAs and achieve a linear amplification. In addition, digital signal processing is widely available at a relatively low cost in nowadays CMOS technology and insensitivity to process variation. Thus, the digital LINC architecture is more suitable for modern process technologies.
While LINC increases the efficiency of power amplifiers, LINC requires an extra power combiner to obtain the linearly amplified signal. This low-efficiency power combiner results in low system power efficiency of wireless transmitters. To not only increase power combiner efficiency but also achieve high PA efficiency, we propose a multilevel out-phasing (MOP) scheme and two architectures: gain-adjusting multilevel LINC (GA-MLINC) and envelope-adjusting multilevel LINC (EA-MLINC). Under WCDMA linearity requirements, 3-level GA-MLINC and 3-level EA-MLINC enhance the LINC system power-added efficiency from 16.5% to 23.6% and 33.4%, respectively.
Subjects
功率放大器
功率
線性化
LINC
PA
power efficiency
Type
thesis
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