Multi band Multi standard 50W high efficiency and highly linear Power Amplifier for Macro Base Stations

2019 IEEE Asia-Pacific Microwave Conference (APMC) Pub Date : 2019-12-01 DOI:10.1109/APMC46564.2019.9038430

P. Rao, D. Krishna, V. M. Pandharipande

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引用次数: 1

Abstract

In this paper, design of multi band multi standard LDMOS 50W high efficiency, high gain and highly linear Asymmetric Doherty Power Amplifier (ADPA) in a common PCB without layout changes to cover all lower 3gpp frequency bands from 729 to 960MHz was presented. To cover different wireless frequency bands, different passive matching components for different frequency bands were used without changing the layout. Quarter wave line lengths were adjusted to cover various bands by providing options with a series of capacitors on quarter wave lines. Care has been taken to keep same matching circuit for at least two adjacent frequency bands. This paper also proposed a drain feed design technique to achieve good Digital Pre Distortion (DPD) performance. The ADPA was characterized with LTE 5MHz signal, achieved a total gain of 52dB with final Doherty Power-Added-Efficiency reaching to 48% over the frequency range at 47dBm output power with output power back off of 8dB from peak. The uncorrected Adjacent Channel Power Ratio (ACPR) over the frequency range observed was −35 dBc, after DPD correction ACPR observed was −63dBc, the LTE 5 MHz 64 QAM Error vector magnitude (EVM) observed was 3.5%, and the ADPA peak power achieved was greater than 55.5dBm.

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用于宏基站的多频段多标准50W高效率高线性功率放大器

本文提出了一种多频段多标准LDMOS 50W高效、高增益、高线性非对称Doherty功率放大器(ADPA)的设计方案，该放大器可覆盖729 ~ 960MHz的低3gpp频段，无需改变布局。为了覆盖不同的无线频段，在不改变布局的情况下，针对不同的频段使用不同的无源匹配元件。通过在四分之一波线上提供一系列电容器的选项，可以调整四分之一波线长度以覆盖各种波段。至少在两个相邻的频带上保持相同的匹配电路。为了实现良好的数字预失真(DPD)性能，本文还提出了一种引流馈电设计技术。该ADPA采用LTE 5MHz信号，总增益52dB，最终Doherty功率附加效率在47dBm输出功率范围内达到48%，输出功率从峰值下降8dB。在观测频率范围内，未校正的相邻信道功率比(ACPR)为−35 dBc, DPD校正后的ACPR为−63dBc，观测到的LTE 5 MHz 64 QAM误差矢量幅度(EVM)为3.5%，实现的ADPA峰值功率大于55.5dBm。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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2019 IEEE Asia-Pacific Microwave Conference (APMC)

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