Minimum pulse reservation-based switching frequency reduction for wideband supply modulated power amplifiers
Minimum pulse reservation-based switching frequency reduction for wideband supply modulated power amplifiers
复制标题
用于宽带电源调制功率放大器的基于最小脉冲预留的开关频率降低
DOI：
10.1049/el.2018.0968
复制
发表时间：
2018
影响因子：
1.1
通讯作者：
Zhu Xiao Wei
中科院分区：
文献类型：
--
作者：
Meng Fan;Yu Chao;Zhu Xiao Wei
提出了一种最小脉冲预留方法来降低电源调制功率放大器（PA）的开关频率。这是通过扩展多电平电源电压的最小脉冲长度来实现的。此外，通过将最小脉冲的最大电压与设计的斩波电压进行比较，以优化的方式保留最小脉冲以使PA效率最大化。为了验证所提出的技术，制造了一个四电平电源调制PA，它由宽带调制信号激励，即40 MHz长期演进信号。实验结果表明，与现有的带宽缩减方法相比，该方法可以显著降低开关频率，实现更高的效率，这对于宽带电源调制功率放大器的设计是非常有前途的。
A minimum pulse reservation method is proposed to reduce the switching frequencies of the supply modulated power amplifier (PA). It is achieved by expanding the minimum pulse length of the multi‐level supply voltage. Also, by comparing the maximum voltage of the minimum pulse with the designed chopped voltage, the minimum pulse is reserved in an optimised way to maximise the PA efficiency. To validate the proposed technique, a four‐level supply modulated PA is fabricated, which is excited by a wideband modulated signal, that is 40‐MHz long‐term evolution signal. Experimental results show that the proposed method can significantly reduce the switching frequencies and achieve higher efficiency than state‐of‐the‐art bandwidth reduction methods, which is very promising for the wideband supply modulated PA design.