Average Efficiency of Class-G Power Amplifiers
Average Efficiency of Class-G Power Amplifiers
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G 类功率放大器的平均效率
DOI：
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发表时间：
1986
影响因子：
4.3
通讯作者：
F. Raab
中科院分区：
文献类型：
--
作者：
F. Raab
G类操作是提高音频功率放大器(PA)和幅度调制器效率的一种廉价而有效的方法。G类功率放大器由两个或多个并联的B类功率放大器组成，具有不同的电源电压。信号的低电压段由放大器的低电压组件放大，从而降低了功耗并提高了效率。G类功率放大器的平均效率取决于电源电压转换点和信号的幅度分布。计算了在AF放大、全载波幅度调制和线性RF PA的包络调制中出现的多个信号的平均效率。对于典型的峰均比，理想的双电压G类功率放大器的平均效率在60%至70%之间，而类似的B类功率放大器的平均效率为35%至40%。
Class-G operation is an inexpensive and yet effective means of increasing the efficiency of audio power amplifiers (PAs) and amplitude modulators. A class-G PA consists of two or more parallel-connected class-B PAs with different supply voltages. Low-voltage segments of the signal are amplified by the low-voltage component of the amplifier, thus reducing power dissipation and increasing efficiency. The average efficiency of a class-G PA depends upon both the supply-voltage transition point and the amplitude distribution of the signal. Average efficiencies are computed for a number of signals that occur in AF amplification, full- carrier amplitude modulation, and envelope modulation of a linear RF PA. For typical peak-to-average ratios, an ideal, two-voltage class-G PA has average efficiencies in the range of 60 to 70 percent, in contrast to the 35 to 40 percent of an analogous class-B PA.