A Novel and Compact Wideband Doherty Power Amplifier Architecture for 5G Cellular Infrastructure

D. K. Sharma, Ravi T. Bura
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Abstract

This paper presents a novel and compact wideband Doherty power amplifier (PA) architecture with a broadband characteristic. An improved impedance configuration is introduced in the load modulation network (LMN) to provide wider bandwidth. As well as it eliminates the need for an output impedance matching network (IMN). Hence the designed device is compact. This approach is a synthesis of key concepts derived from the conventional Doherty PA and the analysis of LMN. For the proposed Doherty PA architecture analytical solution and its thorough analysis are presented. A prototype is designed using commercial GaN transistors that exhibit more than 18% fractional bandwidth in the frequency spectrum from 3.07 to 3.68 GHz. It has been observed that the proposed DPA provides an average output power of 37.0-38.0 dBm with 38.0-45.0% efficiency. Furthermore, it supports a peak-to-average power ratio (PAPR) of 6 dB with an efficiency of 54-68% and peak power of 43.0-44.0 dBm. Proposed Doherty PA also achieved adjacent channel leakage ratio (ACLR) of −32 dBc (without any linearization techniques), output third order intercept (TOI) at 50 dBm and input TOI at 39 dBm.
一种新型紧凑型5G蜂窝基础设施宽带多赫蒂功率放大器架构
提出了一种新型的、紧凑的、具有宽带特性的宽带多赫蒂功率放大器结构。在负载调制网络(LMN)中引入了一种改进的阻抗配置,以提供更宽的带宽。此外,它还消除了对输出阻抗匹配网络(IMN)的需求。因此所设计的装置结构紧凑。该方法综合了传统Doherty PA和LMN分析的关键概念。针对所提出的Doherty PA体系结构,给出了分析方案并对其进行了深入分析。使用商用GaN晶体管设计了原型,该晶体管在3.07至3.68 GHz的频谱范围内具有超过18%的分数带宽。已经观察到,该DPA的平均输出功率为37.0-38.0 dBm,效率为38.0-45.0%。此外,它支持6 dB的峰均功率比(PAPR),效率为54-68%,峰值功率为43.0-44.0 dBm。所提出的Doherty PA还实现了相邻通道泄漏比(ACLR)为- 32 dBc(没有任何线性化技术),输出三阶截距(TOI)为50 dBm,输入TOI为39 dBm。
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