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학술지 A Hybrid Polar-LINC CMOS Power Amplifier With Transmission Line Transformer Combiner
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저자
이홍탁, 장승현, 홍성철
발행일
201303
출처
IEEE Transactions on Microwave Theory and Techniques, v.61 no.3, pp.1261-1271
ISSN
0018-9480
출판사
IEEE
DOI
https://dx.doi.org/10.1109/TMTT.2013.2238552
협약과제
13VI1600, 차세대 이동통신 기지국용 Class-S 전력증폭기 기술 연구, 정재호
초록
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.
키워드
CMOS RF power amplifier (PA), linear amplification with nonlinear components (LINC), outphasing, polar transmitter, supply modulator, transmission line transformer (TLT)
KSP 제안 키워드
Back-off, CMOS PA, CMOS RF, CMOS power amplifier, Class-E amplifier, High bandwidth, Hybrid polar, Operating conditions, Phase Difference, Polar transmitter, RF power amplifier