Abstract
Volt-ampere characteristics of the Josephson junction vortex-flow transistor were studied through comparison of experiment and numerical simulation. Fine structure in the flux flow branch, which is not predicted by a simple particle model for flux flow, is shown to be quantized in voltage. The quantization results from the interaction of the flux wave with the junction’s cavity resonances. It is shown that the separation of the voltage states is proportional to the maximum operating frequency of the device. In an amplifier circuit, quantization in the output voltage will reduce the dynamic range of the device by adding quantization noise. Hysteretic switching between states produces distortion. Possible device modifications for removing the quantization are discussed.
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