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A 3.7GHz GaN HEMT doherty power amplifier using digital predistortion linearization
- Authors
- Jeong, J.[Jeong, J.]; Van, J.[Van, J.]; Cho, J.[Cho, J.]; Kim, M.-S.[Kim, M.-S.]; Cho, H.[Cho, H.]; Lim, K.[Lim, K.]; Kwon, S.-W.[Kwon, S.-W.]; Choi, K.[Choi, K.]; Kim, H.-C.[Kim, H.-C.]; Yoo, S.[Yoo, S.]; Yang, Y.[Yang, Y.]
- Issue Date
- 2008
- Citation
- Proceedings of 2008 Asia Pacific Microwave Conference, APMC 2008
- Journal Title
- Proceedings of 2008 Asia Pacific Microwave Conference, APMC 2008
- Abstract
- In this study, we implemented a 3.7GHz band Doherty amplifier based on GaN HEMTs which was linearized using a digital predistortion method. The forward and reverse models of the predistortion consist of simple polynomials whose coefficients are extracted using a conventional LMSE algorithm. Using two carrier signals based on IEEE 802.16e, whose PAR is 9.44dB, an ACLR improvement of 10.74 dB was achieved to give an ACLR level of 41.74dBc at an offset of 4.79MHz. The overall efficiency of the Doherty power amplifier is 13.74% which represents a 2.44% improvement compared to that of a balanced class-AB power amplifier at an average power of 36dBm. ©2008 IEEE.
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Related Researcher
- YANG, YOUNGOO
- Information and Communication Engineering (Electronic and Electrical Engineering)