A 0.2-6 GHz linearized Darlington-cascode broadband power amplifier
A 0.2-6 GHz linearized Darlington-cascode broadband power amplifier
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DOI：
10.1587/elex.15.20180298
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发表时间：
2018-04
期刊：
影响因子：
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通讯作者：
Shanwen Hu;Shu Yu;Yunqing Hu;Zixuan Wang;Bo Zhou;Zhikuang Cai;Yu-feng Guo
中科院分区：
文献类型：
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作者：
Shanwen Hu;Shu Yu;Yunqing Hu;Zixuan Wang;Bo Zhou;Zhikuang Cai;Yu-feng Guo
提出了一种用于宽带放大的预失真线性化达林顿共源共栅功率放大单元，在共源共栅晶体管的基极端增加了一个RLC峰值网络，在输入达林顿晶体管上增加了一个RC反馈网络。RLC峰化网络优化了带宽和大的信号功率增益。RC反馈网络简化了输入达林顿对的宽带匹配设计。最重要的是，提出了一种在饱和模式下偏置输入达林顿晶体管的优化方法，作为预失真线性化电路，可以补偿下一级共源共栅功率级的增益压缩和相位偏差影响。采用这种补偿技术，所提出的工作在0.2-6 GHz频率范围内的宽带功放获得了比传统达林顿共源共栅放大器更高的OIP3，从而使6 GHz时的OIP3提高了5分贝。该宽带功率放大器采用0.27mm2的InGaP/GaAsHBT芯片管芯，在24~27dBm的频率范围内实现了P1dBm的输出。
A pre-distortion linearized Darlington cascode power amplifier cell is explored for broadband amplifier implementation, with additional inclusion of a RLC peaking network at the base terminal of the cascode transistor, and a RC feedback network at the input Darlington transistor. The RLC peaking network optimizes bandwidth and large signal power gain. The RC feedback network simplifies the design of broadband matching for the input Darlington pair. Most importantly, an optimization method of the input Darlington transistor biased at saturation mode is proposed to function as a predistortion linearizer, which can compensate for gain compression and phase deviation effects of the following cascode power stage. With this compensation technique, the proposed broadband PA operating over a frequency range from 0.2 to 6GHz achieves higher OIP3 than the conventional Darlington cascode amplifier, resulting in a 5 dB improvement of OIP3 at 6GHz. A P1 dB ranging from 24 to 27 dBm over the frequency range is achieved by this broadband power amplifier with a 0.27mm2 InGaP/GaAs HBT chip die.