Josephson D-Gate Memory Circuit for Cryogenic SFQ Data Storage
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Solution Overview
Problem
Current digital logic technologies, such as CMOS, face limitations in performance metrics like speed, power dissipation, computational density, and interconnect bandwidth, prompting the exploration of alternative technologies like superconducting Josephson junction circuits for enhanced performance.
Innovation Solution
A superconducting gate memory circuit utilizing a Josephson D-gate and storage loop, which sets and stores digital states using single flux quantum pulses, enabling efficient data writing and reading through bi-stable loops and Josephson junctions, with interconnects for word and bit 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, computational density, and interconnect bandwidth are limited
Solution Approach 1:
The patent replaces CMOS electronic switching mechanisms with superconducting Josephson junctions that utilize quantum mechanical tunneling effects. This substitution enables significantly higher switching speeds and computational density while reducing power dissipation, as the Josephson junctions operate without resistive losses inherent in CMOS technology.
Solution Approach 2:
The invention changes the fundamental operating parameters by transitioning from room-temperature CMOS operation to cryogenic superconducting operation. This parameter change enables the system to exploit superconductivity effects, achieving higher performance in speed and computational density while managing power dissipation through the unique properties of superconducting materials at low temperatures.
2Ease of manufacture
If CMOS technology is used for digital logic, then ease of manufacture is improved, but speed and interconnect bandwidth are limited
Solution Approach 1:
The patent replaces CMOS electronic switching with superconducting Josephson junctions that utilize quantum mechanical tunneling effects. This substitution enables significantly higher switching speeds and computational density while reducing power dissipation, as the Josephson junctions operate without resistive losses inherent in CMOS technology.
3Ease of manufacture
If CMOS technology is used for digital logic, then ease of manufacture is improved, but power dissipation performance is limited
Solution Approach 1:
The patent replaces CMOS electronic switching mechanisms with superconducting Josephson junctions that utilize quantum mechanical tunneling effects. This substitution enables significantly higher switching speeds and computational density while reducing power dissipation, as the Josephson junctions operate without resistive losses inherent in CMOS technology.
4Productivity
If superconducting Josephson junction circuits are used, then speed, power dissipation, and computational density are improved, but operating temperature requirements worsen
Solution Approach 1:
The invention changes the fundamental operating parameters by transitioning from room-temperature CMOS operation to cryogenic superconducting operation. This parameter change enables the system to exploit superconductivity effects, achieving higher performance in speed and computational density while managing power dissipation through the unique properties of superconducting materials at low temperatures.
5Speed
If superconducting Josephson junction circuits are used, then speed and data rate are improved, but device complexity increases
Solution Approach 1:
The patent replaces CMOS electronic switching mechanisms with superconducting Josephson junctions that utilize quantum mechanical tunneling effects. This substitution enables significantly higher switching speeds and computational density while reducing power dissipation, as the Josephson junctions operate without resistive losses inherent in CMOS technology.
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 solution enables high-speed data storage and retrieval with low power consumption, operating effectively at cryogenic temperatures, thereby overcoming the limitations of traditional CMOS technology.
Implementation Method 1
superconducting Josephson junctions
Implementation Method 2
superconducting gate memory circuit
Data Source
AI summary
One embodiment includes a superconducting gate memory circuit. The circuit includes a Josephson D-gate circuit configured to set a digital state as one of a first data state and a second data state in response to a write enable single flux quantum (SFQ) pulse provided on a write enable input and a respective presence of or absence of a write data SFQ pulse provided on a data write input. The circuit also includes a storage loop coupled to the Josephson D-gate. The storage loop can be configured to store the digital state and to readout the digital state at an output in response to a read enable SFQ pulse provided on a read enable input and a read data SFQ pulse provided on a read data input.