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本文介绍了在 X 波段波导窗孔电路中 GaAs 弛豫振荡器的大信号计算机模拟。研究集中于特殊的振荡器,并使用了实验电路的逼真模型,然而,对于其他 LSA 弛豫振荡器,其结果是具有代表性的。讨论了微波电路的基本特点,以及表示该模式特征的电流-电压波形,频率随偏压调谐情况以及振荡开始时的瞬态特性。给出了振荡建立后小于10个周期的射频输出功率。讨论了能够提供高效率直流-射频转换的最佳电路条件,给出了接近于30%效率的电路参数。最后,还讨论了当存在掺杂梯度时效率下降的情况,当掺杂梯度高至20%和60%时,有可能分别出现15%和10%的效率。因而,表明 LSA 弛豫模不象正弦 LSA 模对掺杂梯度那样灵敏。
This paper introduces the large-signal computer simulation of GaAs relaxation oscillator in X-band waveguide window circuit. Research focused on specific oscillators and used realistic models of experimental circuits, however, the results were representative for other LSA relaxation oscillators. The basic characteristics of the microwave circuit, the current-voltage waveform that characterizes the mode, the tuning of the frequency with bias, and the transient behavior at the beginning of oscillation are discussed. Gives the RF output power less than 10 cycles after the oscillation is established. Discusses the best circuit conditions that provide high efficiency DC-RF conversion, and gives circuit parameters close to 30% efficiency. Finally, the case of declining efficiency in the presence of doping gradients is also discussed, with 15% and 10% efficiency being possible at doping gradients as high as 20% and 60% respectively. Thus, it is shown that the LSA relaxation mode is not as sensitive as the sinusoidal LSA mode to the doping gradient.