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A Hybrid Polar-LINC CMOS Power Amplifier With Transmission Line Transformer Combiner
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- Authors
- Hongtak Lee, Seunghyun Jang, Songcheol Hong
- Issue Date
- 2013-03
- Citation
- IEEE Transactions on Microwave Theory and Techniques, v.61, no.3, pp.1261-1271
- ISSN
- 0018-9480
- Publisher
- IEEE
- Language
- English
- Type
- Journal Article
- Abstract
- This paper demonstrates the implementation of a hybrid polar linear amplification with nonlinear components (LINC) power amplifier (PA) that uses the combination of polar and LINC schemes. The hybrid polar-LINC operation is based on the idea of representing envelope information with the combination of the two schemes. The high bandwidth burden of a supply modulator in a polar transmitter can be effectively relieved, and the back-off efficiency of a LINC transmitter is improved. The implementation is accomplished with a CMOS PA and a CMOS supply modulator. The designed PA includes a class-E amplifier and the proposed output combiner, which is based on a transmission line transformer with isolation resistors. Since the combiner keeps the operating condition of PAs intact regardless of the phase differences, out-phased signals for LINC can be linearly combined. The implemented hybrid polar-LINC architecture, including the PA and a supply modulator, has a 28.5-dBm maximum linear power and 29.6% efficiency without any pre-distortions. © 2012 IEEE.
- KSP Keywords
- CMOS PA, CMOS power amplifier, Class-E amplifier, Hybrid polar, Operating condition, Phase Difference, Polar transmitter, Supply modulator, Transmission line transformer, back-off, high-bandwidth