功率回退法就是把功率放大器的输入功率从1dB压缩点(相当于放大器线性区和非线性区的临界点）向后回退6-10个分贝，工作在远小于1dB压缩点的电平上，使功率放大器远离饱和区，进入线性工作区，从而改善功率放大器的三阶交调系数。一般情况，当基波功率降低1dB时，三阶交调失真改善2dB。
The RF amplifiers usually use power back-off to achieve the system’s linearity requirement under non-constant envelope modulation.
非恒包络调制方式的使用使得射频放大器通常需要采用功率回退的方法来达到系统线性的要求。
参考来源 - 宽带射频功率放大器的数字预失真技术研究In this paper, the wideband match, power backspace, degenerative feedback and other technology were used to design. At last, the demand index was obtained.
鉴于这个原因,在理论设计上采用了宽带匹配、功率回退、负反馈等技术;最终达到所要求的指标。
参考来源 - 225MHz·2,447,543篇论文数据，部分数据来源于NoteExpress
传统的功率回退应用方法存在器件及效率方面的限制。
However, traditional power back off method owns poor efficiency and is limited by electronic devices.
功率回退分为上行功率回退(upbo)和下行功率回退(DPBO)。
Power back-off to VDSL2 is divided into upstream power back-off (UPBO) and downstream power back-off (DPBO).
目前线性功率放大器的设计主要采用前馈、预失真和功率回退等线性化技术。
Feedforward, Predistortion and Feedback linearization techniques are mostly used in Linearity Power Amplifier Design.
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