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US 7,095,227 B2Granted
Superconducting driver circuit
AssigneeInternational Superconductivity Technology Center, The Juridical Foundation
InventorsYoshinobu Tarutani, Masahiro Horibe, Keiichi Tanabe
Life of this patent
Estimating the term…
Abstract
To obtain a superconducting driver circuit which can obtain an output voltage of several millvolts or above, can use a DC power source as a driving power source, can form no capacitance between it and a ground plane, and has a small occupation area, the superconducting driver circuit is constructed by superconducting flux quantum interference devices (SQUIDs) each constructing a closed loop having as components two superconducting junctions and an inductor. The SQUIDs share the inductors and are connected in series in three or more stages.
Claims10
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.
A superconducting driver circuit for voltage amplification comprising:
- superconducting flux quantum interference devices in a first stage in which a plurality of superconducting flux quantum interference devices each constructing a closed loop having as components two superconducting junctions and an inductor are arrayed in parallel so as to share an adjacent superconducting junction;
- superconducting flux quantum interference devices in a second stage in which a plurality of superconducting flux quantum interference devices each constructing a closed loop having as components two superconducting junctions and an inductor are arrayed in parallel in number one fewer than the superconducting flux quantum interference devices in the first stage so as to share said inductor and to share the adjacent superconducting junction;
- and superconducting flux quantum interference devices in a third stage in which a plurality of superconducting flux quantum interference devices each constructing a closed loop having as components two superconducting junctions and an inductor are arrayed in parallel in number one fewer than the superconducting flux quantum interference devices in the second stage so as to share the inductor of said superconducting flux quantum interference device in the second stage and to share the adjacent superconducting junction, wherein the superconducting junctions of the superconducting flux quantum interference devices in said respective stages have almost equal critical current values, 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 devices in the first stage to obtain an output voltage from the superconducting flux quantum interference devices in the third stage.
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 except for the superconducting junctions of the superconducting flux quantum interference device in the first stage, and a flux quantum signal is inputted to two superconducting junctions of 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.
A superconducting circuit comprising:
- a superconducting flux quantum circuit performing predetermined signal processing using a flux quantum as a signal carrier;
- a superconducting flux quantum-voltage converter circuit which inputs a flux quantum signal outputted from the superconducting flux quantum circuit to output, for each flux quantum signal input, a repeat state of a state that a flux quantum train exists and a state that a flux quantum train does not exist;
- and a superconducting driver circuit for voltage amplification receiving as an input the output of the superconducting flux quantum-voltage converter circuit.
Dependencies are inferred from the claim text.