To investigate the properties of the Josephson junction and its related circuits

a model of Josephson junction in Multisim has been created.Both the DC (Direct Current) Josephson effect and AC(Active Current) Josephson effect are testified using the model in Multisim.Subsequently

we observe a quasi-periodic motion in the Josephson junction by studying chaotic behaviors of the resistively-capacitively-inductively shunted junction.Besides

we investigate the characteristics of Shapiro steps in chaos and its special effect under thermal noises.Finally

rapid single flux quantum circuit is constructed to convert DC pulse to SFQ (Single Flux Quantum).The simulation results show that the model is powerful so that it can produce valuable predictions in the research of the Josephson junction

which plays an important role in analyzing and designing a superconductive device.