A 50W Highly Linear 3-Way Integrated Wideband Doherty PA for Small-Cell Application

Hao Zhang, S. De Meyer, C. Duvanaud, S. Bachir
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引用次数: 2

Abstract

This article presents the realization and measurement results of a 50W highly linear 3-way integrated Wideband Doherty P A using LDMOS (laterally diffused metal oxide semiconductor) technology. The efficiency / linearity compromise is highly optimized for a power range from 12 dB OBO (output back-off) to 8 dB OBO for the frequency range from 1800 MHz to 2200 MHz. The proposed 3-way integrated combiner uses Cds (drain-to-source capacitance) absorption method to achieve wideband impedance transformation. Linear gain around 16 dB with efficiency >41 %, raw ACPR (Adjacent Channel Power Ratio) of −40dBc was measured at 12 dB back off. At 8 dB back off, efficiency of 45-49% with a raw ACPR< −35 dBc was measured with WCDMA signal. For the optimized Doherty, the measured AMPM(amplitude-to-phase) values at P3dB level has a minimal spread < 5 deg and consistent shape in a fractional bandwidth of 20%. At 39 dBm Pout, 8 dB OBO, the DPA was corrected to <-55 dBc with 60 MHz ISBW in the band B1, B2, B3. The highly linear performance demonstrates that the designed RFIC presents a suitable candidate for multi-band MIMO application for the selected frequency band from 1800 MHz to 2200 MHz.
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50W高线性3路集成宽带Doherty小小区扩音器
本文介绍了采用LDMOS(横向扩散金属氧化物半导体)技术的50W高线性3路集成宽带Doherty pa的实现和测量结果。在1800 MHz至2200 MHz的频率范围内,从12 dB OBO(输出回退)到8 dB OBO的功率范围内,效率/线性度折衷得到了高度优化。提出的3路集成组合器采用Cds(漏源电容)吸收方法实现宽带阻抗变换。线性增益约为16 dB,效率> 41%,原始ACPR(相邻通道功率比)为- 40dBc。在8 dB回退时,WCDMA信号在原始ACPR< - 35 dBc时的效率为45-49%。对于优化的Doherty,在P3dB电平上测量的AMPM(幅相比)值在20%的分数带宽内具有最小的扩展< 5度和一致的形状。在输出为39dbm,输出为8db时,DPA在B1、B2、B3波段以60mhz ISBW校正至<- 55dbc。高线性性能表明,所设计的RFIC在1800mhz至2200mhz范围内适合多频段MIMO应用。
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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