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本文研究了微波超导ＶＦＴ（涡旋流管）分布放大器的输入输出特性并给出了模拟设计结果。在分布放大器中，器件的寄生参量作为“有用”元件和集综元件一起构成有源器件的仿真传输线。这样，由于放大器的输入输出阻抗等于传输线的特性阻抗，因此可以增加级数（通常为几十）而又消除了寄生参量的影响，从而获得微波信号的宽频带高增益放大。ＶＦＴ放大器可以模拟为低阻抗电流控制电压源。采用平衡控制和非对称偏置技术，可以减少馈通电客和自场效应的影响，获得陡峭的输出特性。模拟结果表明：在１ＭＨｚ到１００ＧＨｚ的频率范围内，获得１８ｄＢ的功率增益和－１２０ｄＢ的反向隔离度是可行的。
In this paper, the input and output characteristics of a microwave superconducting VFT (vortex tube) distribution amplifier are studied and the simulation results are given. In a distributed amplifier, the parasitic parameters of the device form the artificial transmission line of the active device together with the assembly elements as a “useful” component. In this way, since the input-output impedance of the amplifier is equal to the characteristic impedance of the transmission line, the effect of parasitic parameters can be increased by increasing the number of stages (usually several dozen) and wideband high-gain amplification of the microwave signal can be obtained. The VFT amplifier can be modeled as a low-impedance current control voltage source. The use of balanced control and asymmetric biasing techniques can reduce the effects of feedthrough and self-field effects and achieve steep output characteristics. Simulation results show that it is feasible to obtain 18dB power gain and -120dB reverse isolation in the frequency range of 1MHz to 100GHz.