Superconducting Rising-Edge Detection With Return-to-Zero Pulses
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Solution Overview
Problem
CMOS technology-based digital circuits face limitations in device size and high power consumption, especially due to static power dissipation and current leakage even when inactive, leading to inefficiencies in high-performance digital systems.
Innovation Solution
The implementation of superconducting logic circuits using Josephson junctions, which convert input signals into return-to-zero signals, allowing only forward propagating positive pulses to pass while suppressing negative pulses, and using AC power to eliminate static power dissipation and ground return current.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If CMOS technology is used for digital circuits, then device functionality and integration are achieved, but power consumption increases due to static power dissipation and current leakage
Solution Approach 1:
The patent transitions from CMOS technology operating at room temperature to superconducting circuits operating at cryogenic temperatures (below critical temperature Tc). This parameter change in operating temperature enables zero static power dissipation by eliminating resistive losses through superconductivity, directly resolving the contradiction between functionality and power consumption.
Solution Approach 2:
The patent utilizes the phase transition of materials from normal conducting state to superconducting state by cooling below critical temperature. This phase transition enables the circuit to operate with zero electrical resistance, eliminating static power dissipation and current leakage while maintaining full digital circuit functionality.
2Productivity
If CMOS circuits operate at high clock speeds, then processing performance improves, but power consumption increases due to dynamic and static power loss
Solution Approach 1:
The patent changes the operating temperature parameter to cryogenic levels, enabling superconducting operation. This allows high-speed digital logic operation with negligible power consumption, as both dynamic switching losses and static leakage are dramatically reduced compared to room temperature CMOS operation.
3Loss of energy
If superconducting circuits are implemented, then power consumption is reduced to zero static dissipation, but device complexity and cooling requirements increase
Solution Approach 1:
The patent integrates the cooling system directly with the superconducting circuit substrate, merging the thermal management infrastructure with the computational platform. This consolidation approach reduces overall system complexity by eliminating separate cooling apparatus and directly coupling the cryogenic environment to the superconducting devices.
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
This approach results in low-power superconductor logic circuits with zero static power dissipation, compact design, and reduced component requirements, effectively addressing the power consumption issues of CMOS technology.
Implementation Method 1
The implementation of superconducting logic circuits using Josephson junctions
Implementation Method 2
superconducting logic based circuits
Data Source
AI summary
Superconducting circuits and methods for detecting a rising edge of an input signal are described. An example superconducting circuit includes an input terminal for receiving an input signal comprising both positive pulses and negative pulses. The superconducting circuit further includes a first stage, coupled to the input terminal and a first node, configured to suppress both any backward propagating negative pulses and any forward propagating negative pulses, and allow propagation of any forward propagating positive pulses. The superconducting circuit further includes a second stage, coupled to the first node, configured to store a forward propagating positive pulse and reflect a stored positive pulse back to the first node as a negative pulse such that in response to each rising edge of the input signal a return-to-zero signal comprising both a rising edge and a falling edge is provided as an output at the first node.