Superconducting Circuit Timing Paths With Shadow Element Reconciliation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
CMOS technology in semiconductor-based integrated circuits faces limitations in device size and high power consumption, particularly in high-performance digital circuits, with inactive circuits still consuming power due to maintaining transistor states, and superconducting logic-based circuits face challenges in creating correctly timed designs with active transmission elements.
Innovation Solution
A method and system for determining critical timing paths and reconciling topology in superconducting circuit designs using Josephson junctions, involving phase assignments, Josephson transmission lines, and shadow elements to ensure proper timing and reduce power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If superconducting logic circuits with active transmission elements are used, then power consumption is reduced compared to CMOS technology, but creating correctly timed designs becomes more complex
Solution Approach 1:
The patent applies preliminary action by performing timing analysis and phase assignment before final circuit implementation. The system calculates critical timing paths and assigns phases to logic gates in advance, ensuring correct timing is built into the design structure before deployment, thus avoiding timing issues without requiring complex runtime control mechanisms.
Solution Approach 2:
The patent uses phase assignment as an intermediary mechanism to manage timing in superconducting circuits. By introducing phase information as a separate control dimension, the system mediates between the logic function requirements and timing constraints, allowing complex timing relationships to be managed through phase relationships rather than direct temporal control.
2Measurement precision
If timing analysis is performed on all logic gates in a superconducting circuit, then accurate timing paths are identified, but computational resources and time are consumed
Solution Approach 1:
The patent applies segmentation by dividing the circuit into timing constraint groups based on phase relationships. Instead of analyzing all logic gates uniformly, the system segments gates that share the same phase and can be analyzed together, reducing the overall computational complexity while maintaining timing accuracy for each segment.
Solution Approach 2:
The patent uses universal phase assignment rules that can be applied to multiple logic gates simultaneously. By establishing phase relationships that govern groups of gates rather than analyzing each gate individually, the system achieves timing analysis for multiple components through a unified approach, reducing redundant computations.
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 method effectively identifies and adjusts critical timing paths in superconducting circuits, optimizing power usage and ensuring accurate timing, thereby addressing the limitations of CMOS technology and enhancing the design of superconducting logic 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
inserting a Josephson transmission line (JTL) between a source terminal associated with the target logic gate and the first sink terminal
Data Source
Figure 1
Figure 2
Figure 3
AI summary
Systems and methods for determining timing paths and reconciling topology in a superconducting circuit design are provided. The design may include a first timing path having a first set of timing pins associated with a first timing constraint group including a first timing endpoint and a second timing endpoint. An example method includes processing (step 1510) the first timing constraint group to assign a first legal start time to the first timing endpoint and a second legal start time to the second timing endpoint. The method further includes inserting (step 1520) a first shadow element (fig. 9: 914) representing a first physically connected component on the timing path, where the first shadow element precedes the first timing endpoint or follows the second timing endpoint. The method further includes addressing (step 1530) any changes to the first legal start time or the second legal start time caused by an insertion of the first shadow element on the timing path.