Superconducting Cell Array Logic With Selective Coupling
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Solution Overview
Problem
Current digital logic technologies, such as CMOS, face limitations in terms of speed, power dissipation, computational density, and interconnect bandwidth, prompting the need for alternative solutions like superconducting digital technology using Josephson junctions for enhanced performance.
Innovation Solution
A superconducting cell array logic circuit system is developed, comprising a plurality of superconducting cells arranged in rows and columns, allowing for selective coupling of inputs to outputs to perform logic operations based on inductive coupling or magnetic states, enabling high-speed and low-power digital logic operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If CMOS technology is used for digital logic, then manufacturing maturity and ease of manufacture are improved, but speed, power dissipation, and computational density deteriorate
Solution Approach 1:
The patent transitions from CMOS technology operating at room temperature to superconducting technology operating at cryogenic temperatures (near absolute zero). This parameter change in operating temperature enables Josephson junctions to exhibit superconducting behavior, achieving significantly higher computational density, speed, and energy efficiency while maintaining manufacturability through established thin-film deposition techniques.
Solution Approach 2:
The patent replaces the resistive switching mechanism in CMOS with the quantum mechanical Josephson effect in superconducting junctions. This substitution eliminates resistive heating and enables lossless current flow, resulting in ultra-low power dissipation and high-speed operation without sacrificing manufacturing capability through conventional semiconductor fabrication processes.
2Speed
If superconducting Josephson junctions are used, then speed and power dissipation are improved, but operating temperature requirements worsen
Solution Approach 1:
The patent exploits the phase transition of materials from normal conducting state to superconducting state at critical temperatures. By operating below the critical temperature of the superconducting material, the system achieves zero electrical resistance and lossless current flow, enabling ultra-high speed operation (20 Gb/s and above) and extremely low power dissipation (around 4 nW per gate).
Solution Approach 2:
The patent designs superconducting logic circuits that can operate in both adiabatic and non-adiabatic modes, and can be configured for various logic families (RSFQ, ERSFQ, NFQ). This multi-functionality allows the same superconducting technology to achieve high speed, low power, and programmable logic operations, making the cryogenic operation worthwhile through versatile performance.
3Adaptability or versatility
If superconducting cell arrays are configured for selective coupling, then logic operation flexibility is improved, but device complexity increases
Solution Approach 1:
The patent divides the superconducting logic system into modular cell arrays, where each cell contains Josephson junctions that can be independently configured. This segmentation allows flexible implementation of different logic operations by selectively coupling cells through programmable interconnects, achieving high adaptability while managing complexity through standardized modular building blocks.
Solution Approach 2:
The patent implements dynamically reconfigurable superconducting logic where the coupling between cells can be changed during operation. This is achieved through programmable switches and controllable interconnects that allow the logic function to be adapted in real-time, providing versatility without permanent complex wiring structures.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The system achieves high-speed logic operations with low power dissipation, operating at low temperatures, and allows for field-programmable logic operations, surpassing the limitations of traditional CMOS technology.
Implementation Method 1
superconducting Josephson junctions
Implementation Method 2
selective coupling of the at least one input to the at least one output via the plurality of superconducting cells
Data Source
AI summary
One embodiment describes a superconducting cell array logic circuit system. The system includes a plurality of superconducting cells arranged in an array of at least one row and at least one column. The superconducting cell array logic circuit system can be configured to implement a logic operation on at least one logic input signal received at at least one respective input associated with the respective at least one row to provide at least one logic output signal on at least one respective output associated with the at least one column based on a predetermined selective coupling of the at least one input to the at least one output via the plurality of superconducting cells.