Title :
Gain Enhancement in Inductively-Loaded Distributed SIS Junction Arrays
Author :
Tong, Cheuk-Yu Edward ; Blundell, Raymond ; Megerian, Krikor G. ; Stern, Jeffrey A. ; Pospieszalski, Marian ; Pan, Shing-Kuo
Author_Institution :
Harvard-Smithsonian Center for Astrophys., Cambridge
fDate :
6/1/2007 12:00:00 AM
Abstract :
Due to their very low IF output capacitance, series-connected distributed SIS junction array mixers possess very wide IF bandwidth. However, careful control of parasitic inductance in the IF network is important in order to obtain a flat IF response in this class of wideband mixer. We have studied the effect of inductive loading on the operation of these mixers, both experimentally and theoretically. It is shown that over the range of IF where the reactive part of the load impedance is large, a higher mixer conversion gain accompanied by a lower noise temperature is observed.
Keywords :
capacitance; submillimetre wave mixers; superconductor-insulator-superconductor mixers; SIS junction array mixers; gain enhancement; low IF output capacitance; submillimeter waves; superconductor-insulator-superconductor mixers; wideband mixer; Bandwidth; Bonding; Capacitance; Frequency; Grounding; Impedance; Inductance; Mixers; Superconducting device noise; Wires; Intermediate frequency bandwidth; mixer theory; submillimeter waves; superconductor-insulator-superconductor mixers;
Journal_Title :
Applied Superconductivity, IEEE Transactions on
DOI :
10.1109/TASC.2007.898180