An Amplitude and Phase Mismatches Calibration Technique for the LINC Transmitter With Unbalanced Phase Control

The linear amplifier with nonlinear components (LINC) is highly efficient because it uses a highly efficient nonlinear power amplifier (PA). However, the linearity performance of the LINC system is easily degraded by amplitude and phase mismatches between the two paths. In this paper, we propose a n...

Full description

Saved in:
Bibliographic Details
Published in:IEEE transactions on vehicular technology 2011-11, Vol.60 (9), p.4184-4193
Main Authors: Joonhoi Hur, Hyoungsoo Kim, Ockgoo Lee, Kwan-Woo Kim, Kyutae Lim, Bien, F.
Format: Article
Language:English
Subjects:
Amplifiers
Amplitudes
Applied sciences
Calibration
Circuit properties
Direct current
Electric, optical and optoelectronic circuits
Electrical engineering. Electrical power engineering
Electrical machines
Electronic circuits
Electronics
Exact sciences and technology
Linear amplification using nonlinear components (LINC)
Linearity
linearization
Mathematical analysis
mismatch calibration
Noise levels
Nonlinearity
OFDM
orthogonal frequency-division multiplexing (OFDM)
outphasing amplification
Phase control
Power generation
Radiocommunications
Regulation and control
Signal convertors
Telecommunications
Telecommunications and information theory
Transmitters. Receivers
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:The linear amplifier with nonlinear components (LINC) is highly efficient because it uses a highly efficient nonlinear power amplifier (PA). However, the linearity performance of the LINC system is easily degraded by amplitude and phase mismatches between the two paths. In this paper, we propose a novel mismatch calibration technique for the LINC system that calibrates both phase and amplitude mismatches with only phase control. The technique detects mismatches between two paths without any iteration using predefined five test vector signals. In addition, this technique corrects the path mismatches using unbalanced phase control. Therefore, the proposed scheme does not require additional amplitude mismatch control blocks such as dc/dc converters or low drop output regulators (LDO). The linearity performance of the proposed LINC system is measured with 7-MHz bandwidth orthogonal frequency-division multiplexing (OFDM) signals. According to the measurement results, the proposed technique significantly enhances linearity. The measurement results also shows that the proposed LINC system satisfies the error vector magnitude (EVM) requirement for a 16-state quadratic amplitude modulation (QAM) signal (-24 dB) and a 64-QAM signal (-31 dB) up to 3.8- and 2.35-dB amplitude mismatches, respectively, with any phase mismatch.
ISSN:0018-9545
1939-9359
DOI:10.1109/TVT.2011.2171062