Implementation of Flat Gain Broadband Power Amplifier With Impedance Rotation Compensation

Implementation of Flat Gain Broadband Power Amplifier With Impedance Rotation Compensation
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具有阻抗旋转补偿的平坦增益宽带功率放大器的实现

DOI:
10.1109/access.2019.2892865
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发表时间:
2019-01
期刊:
影响因子:
3.9
通讯作者:
Wang Jianwei
Wang Jianwei
中科院分区:
计算机科学3区
文献类型:
--
作者:
Meng Xiangyu;Yu Cuiping;Liu Yuanan;Wu Yongle;Wang Xiyu;Wang Jianwei

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传统的低通结构宽带阻抗匹配网络不能提供足够的宽带阻抗旋转以实现功率放大器(PA)的最佳宽带工作,从而导致性能变化和退化。潜在的约束是相反阻抗旋转的现象。在此背景下,本文提出了一种使用带通拓扑结构来补偿PA的频率变化响应的方法。采用Cree公司的CGH 40010 F芯片验证了该补偿方法的有效性。实验结果与模拟结果吻合较好。在1.7 ~ 2.7GHz频段内,该功率放大器具有良好的增益平坦度(± 0.5dB)、输入/输出回波损耗(>13 dB)和高功率附加效率(> 60%)。经过数字预失真后,当功率放大器由5和10 MHz WCDMA信号驱动,功率回退为6.5 ~ 7 dB时,在±5和±10 MHz偏移下测得的邻道功率比约为−55和−50 dBc。
The conventional broadband impedance matching network in low-pass structure cannot present adequate broadband impedance rotation for the optimum broadband operation of the power amplifier (PA), resulting in performance variations and degradations. The underlying constraint is the phenomenon of opposite impedance rotation. Against such a backdrop, this paper presents a methodology using the band-pass topology to compensate the frequency-variable response of the PA. The CGH40010F from Cree is used to verify the effectiveness of this compensation method. The experimental results are in good agreement with the simulation. The proposed PA yields good gain flatness (±0.5 dB), input/output return loss (>13 dB), and high power added efficiency (>60 %) over the band from 1.7 to 2.7 GHz. After digital predistortion, the measured adjacent channel power ratio is about −55 and −50 dBc at ±5 and ±10 MHz offset when the PA is driven by 5- and 10-MHz WCDMA signals at 6.5 ~ 7 dB power back-off.
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