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Bien, Franklin
Bien’s Integrated Circuit Design Lab (BICDL)
Research Interests
  • Wireless Power Transfer(WPT), touch screen, finger print, RADAR, RF IC.

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

Cited 4 times inthomson ciCited 4 times inthomson ci
Title
An Amplitude and Phase Mismatches Calibration Technique for the LINC Transmitter With Unbalanced Phase Control
Author
Hur, JoonhoiKim, HyoungsooLee, OckgooKim, Kwan-WooLim, KyutaeBien, Franklin
Keywords
Calibration techniques; Error vector magnitude; LINC transmitters; Linear amplification using non linear components; Linear amplifiers; Measurement results; Mismatch calibration; Mismatch control; Nonlinear components; Nonlinear power amplifiers; Outphasing; Path mismatch; Phase mismatch; Quadratic amplitude modulations; Test vectors
Issue Date
201111
Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
Citation
IEEE TRANSACTIONS ON VEHICULAR TECHNOLOGY, v.60, no.9, pp.4184 - 4193
Abstract
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.
URI
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DOI
http://dx.doi.org/10.1109/TVT.2011.2171062
ISSN
0018-9545
Appears in Collections:
ECE_Journal Papers

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