Abstract
A superconductor–normal metal–superconductor junction (SNS junction) has a nonlinear current–voltage characteristic (CVC) that may exhibit the low-voltage negative differential resistance (LVNDR) effect. Taking advantage of this remarkable effect it may be possible to associate a SNS junction to conventional electronic circuits in order to design devices such as oscillators, amplifiers and mixers. This work simulates the output signal of an amplifier device, which is essentially a SNS junction connected with an adjustable DC voltage supplier, and an AC signal source, which could be a SNS junction as well. Sometimes the LVNDR effect is hidden under a low-voltage hysteresis on the CVC because the experiment has been performed in a current-bias measuring setup. We focus on the question of this hysteretic behavior and discuss the performance of the proposed device with and without hysteresis.
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