A new method for the analysis and design of the class E power amplifier taking into account the Q_L factor
A new method for the analysis and design of the class E power amplifier taking into account the Q_L factor
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考虑Q_L因素的E类功率放大器分析设计新方法
DOI：
10.1109/tcs.1987.1086185
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发表时间：
1987
期刊：
影响因子：
--
通讯作者：
N. Voulgaris
中科院分区：
文献类型：
--
作者：
C. Avratoglou;N. Voulgaris
以往关于E类功率放大器的文献大多是基于Raab提出的一种分析方法，该方法假定串联调谐电路的Q_L因子足够高，使得输出电流实质上是载波频率上的正弦电流。本文提出并实现了一种分析和设计E类放大器的新方法，它适用于串联调谐、并联电容的E类放大器，消除了Q_L无穷大的假设。通过求负载网络状态变量的稳态初始条件，得到了放大器的性能方程。然后将设计要求强加于所得到的方程式。这导致了一个非线性设计方程组，使用数值优化方法对设计值进行求解。当Q_L值小于15时，用该方法得到的设计值与RAAB给出的设计值之间的差异逐渐变得显著。文中给出的性能曲线清楚地表明，Q_L对放大器的整体性能有很大影响。因此，这种分析和设计方法是有用的，因为它提供了准确的设计值，确保了E类放大器即使在低Q_L的情况下也能达到最佳和安全的性能，它为Q_L通常的权衡提供了定量的准则，并且使放大器的性能更可预测。
Most previous papers on class E power amplifier are based on an analysis method proposed by Raab in which it is assumed that the Q_L factor of the series-tuned circuit is high enough that the output current is essentially a sinusoid at the carrier frequency. In this paper, a new method for the analysis and design of a class E amplifier is presented and implemented for the case of the series-tuned, shunt-capacitor class E configuration, in which the assumption of infinite Q_L is eliminated. The amplifier performance equations are obtained by finding the steady-state initial conditions of the load-network state variables. The design requirements are then imposed on the resulting equations. This leads to a nonlinear system of design equations which is solved for the design values using numerical optimization methods. For values of Q_L less than 15, the differences between the design values obtained using this method and those given by Raab become gradually more significant. The performance curves given in this paper show clearly that the overall amplifier performance is strongly affected by Q_L . Therefore, this method of analysis and design is useful because it provides accurate design values which ensure optimum and safe performance for the class E amplifier even in cases of low Q_L , it provides quantitative criteria for the usual tradeoffs concerning Q_L , and it makes the amplifier performance more predictable.