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E类调谐功率放大器由负载网络和一只晶体管组成,该晶体管在输出载频信号时起开关作用。最简单的负截网络由并联在晶体管上的电容器和一组串联调谐输出回路组成,输出回路具有剩余电抗。当晶体管导通时,回路工作由晶体管决定,当晶体管截止时,回路工作由负载网络的瞬变响应决定。本文假设为高Q值,利用富里埃级数法来推导出放大器工作的基本公式,然后利用这些公式去确定工作在百分之百效率时的最佳元件值,并确定了其他元件值的组合以及在百分之百效率时所产生的占空因数。还分析了集电极电压波形的谐波成份,讨论了有关放大器的线路。
Class E tuned power amplifiers consist of a load network and a transistor that switches on when the carrier frequency signal is output. The simplest negative-cut network consists of a capacitor in parallel with the transistor and a set of series-tuned output circuits that have residual reactances. When the transistor is on, the loop operation is determined by the transistor, and when the transistor is off, the loop operation is determined by the transient response of the load network. Assuming a high Q value, we use the Fourier method to derive the basic equations for amplifier operation, and then use these equations to determine the best component values for operation at 100% efficiency and to determine the combination of other component values and the percentages at 100% Duty cycle resulting from efficiency. The harmonic components of the collector voltage waveform are also analyzed, and the amplifier-related circuitry is discussed.