Efficient Multisignal 2–4-GHz Power Amplifier With Power Tracking
Efficient Multisignal 2–4-GHz Power Amplifier With Power Tracking
复制标题
具有功率跟踪功能的高效多信号 2–4GHz 功率放大器
DOI：
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发表时间：
2018
影响因子：
4.3
通讯作者：
Z. Popovic
中科院分区：
文献类型：
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作者：
M. Duffy;G. Lasser;M. Olavsbråten;E. Berry;Z. Popovic
本文提出的工作目标是展示一种使用电源调制方法在大带宽上放大多个并发信号的有效方法。提出了一种单级倍频程带宽 (2–4 GHz) 功率放大器 (PA)，其输出功率大于 10W，漏极效率范围为 48%–60%。该放大器使用多个带宽减小的电源调制轨迹进行测试，这些轨迹被构造为 10 MHz LTE 信号包络的偶数幂级数。 <inline-formula> <tex-math notation="LaTeX">$eta _{D}$ </tex-math></inline-formula> 实现了超过 30% 的提升，同时通过数字预失真 (DPD) 保持低于 −45dB ACPR。然后使用类似的带宽缩减技术放大两个间隔为 800 MHz 的 10 MHz LTE 信号。通过使用多维 DPD，线性度得到改善，<inline-formula> <tex-math notation="LaTeX">$eta _{D}$ </tex-math></inline-formula> 增加了 20% 以上。这里提出的方法可以扩展到具有大射频带宽的 PA 的任意间隔的两个以上并发信号。
The goal of the work presented in this paper is to demonstrate an efficient method of amplifying multiple concurrent signals over a large bandwidth using a supply modulation approach. A single-stage octave bandwidth (2–4 GHz) power amplifier (PA) with greater than 10-W output power and drain efficiency ranging from 48%–60% is presented. The amplifier is tested with several reduced-bandwidth supply modulation trajectories that are constructed as an even-termed power series of a 10-MHz LTE signal envelope. A greater than 30% point increase in <inline-formula> <tex-math notation="LaTeX">$eta _{D}$ </tex-math></inline-formula> is achieved while maintaining less than −45-dB ACPR with digital predistortion (DPD). Two 10-MHz LTE signals with 800-MHz spacing are then amplified using a similar bandwidth-reduction technique. A greater than 20% point increase in <inline-formula> <tex-math notation="LaTeX">$eta _{D}$ </tex-math></inline-formula> is seen with an improvement in linearity through the use of multidimensional DPD. The method presented here can be extended to more than two concurrent signals of arbitrary spacing for a PA with large RF bandwidth.