Output power capability of class-E amplifiers with nonlinear shunt capacitance
Output power capability of class-E amplifiers with nonlinear shunt capacitance
复制标题
具有非线性并联电容的 E 类放大器的输出功率能力
DOI：
10.1109/mwsym.2004.1339114
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发表时间：
2004
期刊：
影响因子：
--
通讯作者：
A. Mediano
中科院分区：
文献类型：
--
作者：
P. M. Gaudó;C. Bernal;A. Mediano
高频e类功率放大器中并联电容的非线性产生比预期更高的开关峰值电压，特别是在并联电容仅由器件寄生提供的频率下。峰值必须准确估计，以避免器件击穿，并能够选择一个方便的，不太高估晶体管的应用。此外，非线性行为改变了器件在e类工作时的输出功率能力。当处理有损耗的非线性器件时，将设计的ON占空比降低到0.5以下可能有助于在理想的e类条件下实现更高的频率，而增加它会导致更高的输出功率和效率。本文首次分析了e类放大器在若干占空比和非线性参数下的峰值电压值和输出功率能力。实验结果与数值分析结果吻合较好。
The nonlinearity of the shunt capacitance in a HF class-E power amplifier produces a switch peak voltage higher than expected, in particular at frequencies where the shunt capacitance is solely provided by the device parasitic. Peak values have to be accurately estimated in order to avoid device breakdown and to be able to choose a convenient and not too overestimated transistor for the application. Furthermore, the nonlinear behavior modifies the output power capability of a device in class-E operation. When dealing with a lossy nonlinear device, reducing the ON duty cycle of a design bellow 0.5 might help achieving higher frequencies in ideal class-E conditions, whereas increasing it results in higher output power and efficiency. For the first time, an analysis of peak voltage values and output power capability of a class-E amplifier is presented for several duty-cycles and nonlinearity parameters. Experimental results show good agreement with numerical analysis.