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引用次数: 7
摘要
本文分析了b类同相放大器纯模式和混合模式的工作情况,给出了在假设理想器件的情况下驱动曲线的解析表达式。在纯模式工作时,输出功率仅由相位调制控制。在混合模式操作中,在深度回退功率电平上,幅度控制取代相位控制,节省驱动功率,从而提高效率。采用10.6 dB PAR的W-CDMA信号进行包络仿真,验证了理想的b类共相放大器模型的分析,该模型的晶体管功率增益仅为10 dB。在混合模式操作中,他们预测平均总效率高达65%,比同等不对称(1:3)Doherty放大器高出7%。
Analysis of pure- and mixed-mode class-B outphasing amplifiers
This paper analyses the pure- and mixed-mode operation of class-B outphasing amplifiers and provides the analytical expressions for the drive profiles, when assuming ideal devices. In pure-mode operation, output power is controlled by phase modulation only. In mixed-mode operation, amplitude control replaces phase control at the deep back-off power levels to save driving power and hence improve efficiency. Envelope simulations using a 10.6 dB PAR W-CDMA signal verify the analysis of an ideal class-B outphasing amplifier model with only 10 dB of transistor's power gain. In mixed-mode operation, they predict up to 65% of average total-efficiency which is 7%-points higher than an equivalent asymmetrical (1:3) Doherty amplifier.