Patent ID: 6958487

Claim:
A device for generating a constant voltage comprising: a dielectric substrate, a mesa-shaped superconducting-superlattice structure where plural superconducting layers and plural insulating layers are naturally and alternately stacked and which is formed on said dielectric substrate, a micro strip line for introducing a microwave which is formed so as to be electrically contacted to a top surface of a mesa structural portion of said superconducting-superlattice structure, and a metallic electrode for outputting voltages induced by said microwave so as to be electrically connected to at least one portion of said superconducting-superlattice structure. wherein said mesa structural portion of said superconducting-superlattice structure is covered with an insulating layer and at least one side end of said superconducting-superlattice structure is covered with an insulating member, and a top surface of said mesa structural portion, a top surface of said insulating layer and a top surface of said insulating member are covered with at least one of said micro strip line and said metallic electrode.