SUPERCONDUCTING PHOTOELECTRIC SIGNAL CONVERSION CIRCUIT

摘要

PURPOSE: To enhance the integrity and rapidity by a method wherein the resis tance value is set up so that the calorific power developed by a superconducting photoresponsive element may not exceed a specific value. ;CONSTITUTION: A Josephson gate 104 can be switched by a superconducting photoresponsive element 102 having the current voltage characteristics such as NbN ultrathin film or superconducting feeble coupling if only the load resistor 103 of said element 102 is smaller since the input into the Josephson gate used for the switching is a current not a voltage. Besides, if the load resistor 103 is larger, when photo-irradiated, the current running in the photoresponsive element 102 and the voltage impressed thereon are made higher thereby heating the element 102 by itself resultantly decelerating the responsive rate thereof. Thus, the calorific power per unit space for responding to rapid photosignals is not to exceed 0.5J/m². Accordingly, the value of the load resistor 103 shall be set up for making the calorific power not exceed said value of 0.5J/m².;COPYRIGHT: (C)1993,JPO&Japio