用于200W蜂窝基础设施应用的数字辅助负载调制平衡放大器

E. R. Srinidhi, M. Masood, T. Sharma, J. Staudinger, S. Dhar, P. Rashev, G. Tucker, F. Ghannouchi
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引用次数: 3

摘要

本文首次展示了一种针对5G蜂窝基础设施应用的高功率(200W)负载调制平衡放大器(LMBA)。应用于控制功率放大器(CPA)的注入信号的幅度和相位都使用动态相位整形功能以及预失真数字前端进行配置。数字基带处理可以灵活地改变注入信号到CPA的幅度和相位,从而提高LMBA的效率和整体线性化能力。在实时调制信号激励下,平衡功率放大器(BPA)支路采用分段数字预失真(DPD)方法,平衡功率放大器(CPA)支路采用功率相关相位函数,实现了良好的线性化。LMBA的原型实现是在平衡支路中使用恩智浦的100 W氮化镓(GaN)和碳化硅(SiC)预匹配器件进行的。测量结果实现了53 dBm (200 W)的峰值输出功率,在8 dB后退时线性化效率为44%,在LTE Band-41 (~2.6 GHz)上校正ACPR为-52 dBc。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Digitally Assisted Load Modulated Balanced Amplifier for 200W Cellular Infrastructure Applications
The paper demonstrates, for the first time, a high power (200W) load modulated balanced amplifier (LMBA) targeting 5G cellular infrastructure applications. Both amplitude and phase of the injected signal applied to the control power amplifier (CPA) are configured using a dynamic phase shaping function along with a pre-distortion digital front-end. Digital baseband processing provides flexibility in varying both amplitude and phase of the injected signal to the CPA which improves efficiency and overall linearizability of the LMBA. Under real-time modulated signal excitation, excellent linearization is achieved using a segmented digital predistortion (DPD) approach applied to the balanced power amplifier (BPA) branch and a power-dependent phasing function applied to the CPA branch. The LMBA prototype implementation is carried out using NXP's 100 W gallium nitride (GaN) on silicon carbide (SiC) pre-match device in the balanced branch. Measured results achieve peak output power of 53 dBm (200 W) with 44% linearized efficiency at 8 dB back-off and corrected ACPR of -52 dBc across LTE Band-41 (~2.6 GHz).
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