IF output characteristics of Josephson mixer
Keiichi Yamaguchi, Akira Kawaji, Katsumi Suzuki +2 more
The Josephson junction device is promising as a mixer for regions from millimeter wave to infrared. It is important to analyze Josephson devices to determine the circuit parameters and operating points of the circuits. However, it is difficult to analyze the mixer operation because of the nonlinear characteristic of the Josephson junction device. Therefore, small signal analysis has been conducted in characterizing the Josephson junction device. In this study, a detailed characterization of the IF output characteristic was obtained by introducing the concept of IF Shapiro steps. That is, it was determined that the minima that are not present in the local-oscillator Shapiro steps are present in the Josephson junction mixer output. In addition the impedance of the Josephson junction device was discussed and illustrated using a Smith chart. In this paper, the theoretical result was proved by a mixing experiment on the step-edge junction. As a result, the minima points in the IF output were confirmed. © 1997 Scripta Technica, Inc. Electron Comm Jpn Pt 2, 80(3): 69–79, 1997
Electronics and Communications in Japan (Part II Electronics)•Mar 1, 1997•10 citations