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本文对场发射阴极三极管RF放大器结构进行了理论和实验研究。论述了大几何尺寸的实验结构和对该结构的理论计算。直流和交流测量表明,理论和实验具有良好的一致性。理论电路模拟所取得的数据对将来更高频率工作是很有用的。在低频下测得的RF电压增益约为11dB,200kHz时降到0dB,而且阴极跨导只有38μS。对这种大型结构的模拟计算表明,1000个锥尖的场发射阴极可工作在2MHz左右,其典型跨导值大于380μS。
In this paper, theoretical and experimental studies on the structure of field emission cathode-triode RF amplifier are carried out. The experimental structure of large geometry and the theoretical calculation of the structure are discussed. DC and AC measurements show that the theory and experiment have good consistency. The data obtained from theoretical circuit simulations are useful for future higher frequency work. The RF voltage gain measured at low frequencies is about 11dB, down to 0dB at 200kHz, and the cathode transconductance is only 38μS. The simulation of this large structure shows that 1000 cone-tip field emission cathodes can operate at around 2MHz with a typical transconductance greater than 380μS.