A Comparison for a Doherty power amplifier linearized using digital predistortion and feedforward compensation
A Comparison for a Doherty power amplifier linearized using digital predistortion and feedforward compensation
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使用数字预失真和前馈补偿进行线性化的 Doherty 功率放大器的比较
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发表时间：
2015
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影响因子：
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通讯作者：
R. Braithwaite
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文献类型：
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作者：
R. Braithwaite
Doherty 功率放大器 (PA) 使用数字预失真 (DPD) 和前馈补偿进行线性化。针对 WCDMA 信号测量并比较了线性化 PA 的功耗和 ACLR。用作测试设备的PA对应于前馈功率放大器（FFPA）的主放大器。对于 DPD 测试，误差放大器被关闭。对于给定的直流电源电压，DPD 补偿 PA 比 FFPA 具有更高的效率和更差的 ACLR。当可以降低直流电源电压时，FFPA 和 DPD 校正 PA 的效率变得相似，因为 DPD 解决方案需要比 FFPA 更高的电源电压才能满足 ACLR 规范。
A Doherty power amplifier (PA) is linearized using digital predistortion (DPD) and feedforward compensation. Power consumption and ACLR of the linearized PAs are measured and compared for a WCDMA signal. The PA used as the test device corresponds to the main amplifier of a feedforward power amplifier (FFPA). For the DPD tests, the error amplifier is turned off. For a given DC supply voltage, the DPD-compensated PA has better efficiency and worse ACLR than the FFPA. The efficiencies of the FFPA and DPD-corrected PA become similar when the DC supply voltage can be reduced because the DPD solution requires a higher supply voltage than the FFPA to meet the ACLR specification.