Patent ID: 7095227

Claim:
A superconducting driver circuit for voltage amplification comprising: a superconducting flux quantum interference device in a first stage constructing a closed loop having as components two superconducting junctions and an inductor; a superconducting flux quantum interference device in a second stage constructing a closed loop having as components two superconducting junctions and an inductor by sharing said inductor; and a superconducting flux quantum interference device in a third stage constructing a closed loop having as components two superconducting junctions and an inductor by sharing the inductor of said superconducting flux quantum interference device in said second stage, wherein the superconducting junctions of the superconducting flux quantum interference devices toward a lower stage of the superconducting junctions of the superconducting flux quantum interference devices in said respective stages have a larger critical current value, a predetermined bias current is supplied to the superconducting junctions of the superconducting flux quantum interference devices in said respective stages, and a flux quantum signal is inputted to the superconducting flux quantum interference device in the first stage to obtain an output voltage from the superconducting flux quantum interference device in the third stage.