A Class E Digital Transmitter for 16-APSK

G. Watkins
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Abstract

A digital transmitter architecture is described composed of two independent class E amplifiers with different saturate output powers (POUT). Their output ports are connected directly together without a switch or combiner. The two amplifiers are enabled or disabled by alternatively biasing their gates in synch with the envelope of the input signal. The transmitter is optimised for 16 state amplitude phase shift keying (16-APSK). Under simulation, the two class E amplifiers were optimised for a POUT of 13.6 dBm and 22.7 dBm. 71.4% and 78.2 % power added efficiency (P AE) was achieved respectively. The same transistor was used for both amplifiers and the different POUT defined by the quality factor (Q) of their output bandpass filter (BPF). A practical implementation achieved 49.8% and 45.6% PAE at POUTS of 14.0 dBm and 20.3 dBm respectively. With a 16-APSK signal, 46.9% PAE was achieved at 19.8 dBm POUT, with an error vector magnitude (EVM) of 5.7%.
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用于16 apsk的E类数字发射机
描述了一种由两个独立的E类放大器组成的数字发射机结构,它们具有不同的饱和输出功率(POUT)。它们的输出端口直接连接在一起,没有开关或组合器。通过将两个放大器的门与输入信号的包络同步进行选择性偏置,使能或使能。发射机被优化为16状态振幅相移键控(16- apsk)。仿真结果表明,两种E类放大器的输出功率分别为13.6 dBm和22.7 dBm。功率增加效率(pae)分别为71.4%和78.2%。相同的晶体管用于两个放大器和由其输出带通滤波器(BPF)的质量因子(Q)定义的不同的POUT。在14.0 dBm和20.3 dBm的输出端分别实现了49.8%和45.6%的PAE。对于16 apsk信号,在19.8 dBm POUT下可获得46.9%的PAE,误差矢量幅度(EVM)为5.7%。
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