The Linearization Technique of RF Power Amplifier for Wireless Communications-LINC
Date Issued
2006
Date
2006
Author(s)
Chen, Sheng-Yen
DOI
en-US
Abstract
The power amplifier plays an important role in a modern wireless communication system and is the most power-hungry device. Because of nonlinear characteristic of power amplifier, it is a big challenge to design a high linearity and power efficiency in a wireless transmitter. Linearization and efficiency enhancement techniques of power amplifier can be adopted to improve the linearity and power efficiency of the transmitter.
LINC (Linear Amplification using Nonlinear Components) technique is one of power amplifier’s linearization and efficiency enhancement methods. By adopting LINC technique, nonlinear power amplifier with high power efficiency can be used and the input variable envelope signal can be amplified linearly by a LINC transmitter. Thus, high linearity and power efficiency can be achieved in LINC transmitter.
In this thesis, we describe the operation of LINC system and discuss the nonideal effects on linearity and power efficiency. We use simulation and measurement to verify the LINC transmitter superior to a single Class-A power amplifier on both linearity and efficiency when a variable envelope modulated signal is used. The LINC transmitter contains a signal separator (SCS), two power amplifiers, and a combiner. In measurement, we use two vector signal generator to generate LINC signals in place of SCS, and power amplifiers and combiners are implemented. A series of experiments are carried out step by step. Several power amplifiers and combiners are used in the measurement of LINC transmitter, observing the variations of linearity and power efficiency of these systems.
Subjects
功率放大器
線性化技術
LINC
Power Amplifier
Linearization Technique
Type
thesis
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