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학술지 A Linear InGaP/GaAs HBT Power Amplifier Using Parallel-Combined Transistors With IMD3 Cancellation
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저자
백승준, 안현진, 남일구, 유남식, 이희동, 박봉혁, 이옥구
발행일
201611
출처
IEEE Microwave and Wireless Components Letters, v.26 no.11, pp.921-923
ISSN
1531-1309
출판사
IEEE
DOI
https://dx.doi.org/10.1109/LMWC.2016.2615361
협약과제
15PI1700, LTE-A기지국용 전력증폭기를 포함하는 RF Transceiver통합칩 개발, 박봉혁
초록
In this letter, we present a linear InGaP/GaAs HBT power amplifier (PA) with parallel-combined transistors for small-cell applications. Ballast resistors with bypass resistors and capacitors are employed in parallel-combined transistors. When the resistors and capacitors are set to appropriate values, IMD3 components of the parallel-combined transistors are found to be out of phase with each other by 180째 and are canceled out at the output. The experimental results show that the proposed HBT PA with parallel-combined transistors produces a saturated output power of 33.5 dBm at 0.88 GHz, with a power-added efficiency (PAE) of 46.1% at a 5-V supply voltage. To validate the effectiveness of the proposed HBT PA for linearity improvement, the implemented PA is also tested with a long-term evolution (LTE) signal (8.1-dB PAPR with 10-MHz bandwidth). The proposed PA achieves an adjacent channel leakage ratio (ACLR) below -45 dBc at an average power of 25.6 dBm with a PAE of 18.8% without applying predistortion.
키워드
InGaP/GaAs HBT, parallel-combined transistors, power amplifier, small cell, third-order inter-modulation distortion (IMD3)
KSP 제안 키워드
Adjacent channel leakage ratio(ACLR), Average Power, Gaas hbt power amplifier, InGaP/GaAs HBT, Long term Evolution(LTE), MHz bandwidth, Out of Phase(OoP), Power added efficiency(PAE), Saturated output power, Small cells, Supply voltage