Superconducting Circuit Timing Paths for SFQ Phase Alignment
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Solution Overview
Problem
CMOS technology-based digital circuits face limitations in device size and power consumption, especially at high clock speeds, leading to inefficiencies in power management and timing accuracy in superconducting circuits with Josephson junctions.
Innovation Solution
A method and system for determining critical timing paths in superconducting circuit designs by providing timing information and using processors to assess reachability by single flux quantum pulses, inserting Josephson transmission lines as needed, and adjusting phase assignments to ensure proper timing alignment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by stationary object
If CMOS technology is used for digital circuits, then device functionality is achieved, but power consumption increases and device size reaches limits
Solution Approach 1:
The patent replaces CMOS transistor-based digital logic with superconducting logic gates based on Josephson junctions. This substitution eliminates the need for continuous power supply to maintain transistor states, thereby dramatically reducing static power consumption while preserving digital circuit functionality through quantum mechanical effects in superconducting materials.
Solution Approach 2:
The patent changes the operating parameters by transitioning from semiconductor physics (CMOS) to superconducting physics (Josephson junctions). This involves operating at cryogenic temperatures and utilizing quantum tunneling effects, which fundamentally alters the energy consumption characteristics while maintaining logical operation capabilities.
2Use of energy by stationary object
If superconducting circuits with Josephson junctions are used, then power consumption is reduced, but timing precision deteriorates due to active transmission elements
Solution Approach 1:
The patent removes active transmission elements from the superconducting circuit design. By eliminating these components that introduce timing uncertainties and signal distortion, the design achieves precise timing control through passive superconducting interconnects and carefully managed flux quantum propagation, thereby resolving the timing precision issue while maintaining low power consumption.
Solution Approach 2:
The patent performs preliminary timing analysis and phase assignment during the design stage. By pre-calculating and assigning clock phases to different logic gates before implementation, the system ensures correct timing relationships are established in advance, compensating for the absence of active transmission elements and achieving precise timing control.
3Speed
If active transmission elements are added to superconducting circuits, then signal transmission capability is improved, but design complexity increases
Solution Approach 1:
The patent replaces active transmission elements with passive superconducting interconnects and flux quantum-based signal transmission. This substitution maintains high-speed signal propagation through the inherent properties of superconducting materials while eliminating the complexity associated with active components, thereby achieving fast transmission with simpler design.
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 enhances timing accuracy and reduces power consumption by optimizing the placement of Josephson transmission lines and phase assignments, thereby improving the performance and efficiency of superconducting circuits.
Implementation Method 1
Many superconducting logic circuits include Josephson junctions, which may be controlled using high speed clocks or microwave signals
Implementation Method 2
Superconducting logic-based circuits can also be used to process quantum information, such as qubits
Data Source
AI summary
Systems and methods for determining critical timing paths in a superconducting circuit design including Josephson junctions are provided. An example method includes providing timing information concerning a plurality of source terminals of at least one logic gate coupled with a first sink terminal of the at least one logic gate. The method further includes using a processor, determining whether, in view of the timing information, the first sink terminal is reachable by a single flux quantum (SFQ) pulse within a predetermined range of arrival time based on an assigned first phase to the at least one logic gate.