Abstract
A highly e-cient asymmetrical GaN Doherty power amplifler using traditional ‚=4 transmission line and an asymmetrical GaN Doherty power amplifler (DPA) using composite right/left- handed transmission lines (CRLH-TL) for linearity improvement are presented in this paper. The CRLH-TL is designed to suppress the second harmonic of the output of the carrier amplifler. This DPA using CRLH-TL is designed for 3.5GHz LTE-Advanced Application with 100MHz bandwidth and 37dBm average output power, the carrier and peaking ampliflers are fabricated with the same 30W GaN HEMT and unevenly driven in purpose of maintaining high e-ciency at back-ofi power (BOP) region. At 9-dB and 6-dB BOP, the DE achieves 30% and 40.1%, respectively, and the adjacent channel power ratio (ACPR) are less than i37:1dBc for 40MHz 16QAM signal at 37dBm. In addition, the further linearization of the DPA is realized by using digital pre- distortion (DPD), the ACPRs are improved to i49:6dBc for 40MHz 16QAM signal. The measured results show linearity improvement compared with the traditional DPA.
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