Superconducting SFQ Data Alignment Across Opposite-Phase Clocks
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Solution Overview
Problem
Superconducting circuits face challenges in aligning data propagation between integrated circuits or from room temperature circuits to cryogenic temperature circuits due to time alignment issues.
Innovation Solution
A superconducting data alignment system that includes first and second coupling circuits configured to generate single flux quantum (SFQ) pulses in response to a return-to-zero (RTZ) input pulse aligned with specific phase windows of opposite phase clock signals, and an alignment circuit that generates an output SFQ pulse aligned to one of the clock signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If data is transferred between integrated circuits or from room temperature circuits to cryogenic temperature superconducting circuits, then communication between different environments is achieved, but time alignment of data propagation becomes difficult
Solution Approach 1:
The patent introduces an intermediary alignment circuit that receives pulses from both room temperature and cryogenic circuits and generates aligned output pulses. This mediator circuit translates between different timing domains, allowing data propagation synchronization without requiring direct time coordination between the disparate temperature environments.
Solution Approach 2:
The alignment circuit performs preliminary timing adjustment by capturing input pulses at specific phase windows of a reference clock signal before forwarding them to the output. This advance timing coordination ensures that data arrives at the correct phase regardless of when it was generated in the other circuit environment.
2Ease of operation
If opposite phase clock signals are used in coupling circuits, then data can be aligned to different phases, but circuit complexity increases
Solution Approach 1:
The alignment function is segmented into separate coupling circuits, each dedicated to a specific phase window of the clock signal. This division allows each circuit to be optimized for its specific phase alignment task while the overall system achieves comprehensive multi-phase alignment capability through the combination of these specialized segments.
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 effectively aligns data to a defined phase of a clock signal, ensuring proper data propagation in superconducting circuits, even across different temperature environments.
Implementation Method 1
superconducting Josephson junctions... in which an AC clock signal provides the bias signals to trigger and untrigger the Josephson junctions
Data Source
AI summary
One example includes a data alignment system. The system includes a first coupling circuit configured to receive a return-to-zero (RTZ) input pulse and to generate a first single flux quantum (SFQ) pulse in response to the RTZ input pulse being aligned with a phase window of a first clock signal. The system also includes a second coupling circuit configured to receive the RTZ input pulse and to generate a second SFQ pulse in response to the RTZ input pulse being aligned with a phase window of a second clock signal, the first and second clock signals being opposite in phase. The system further includes an alignment circuit that is configured to generate an output SFQ pulse that is aligned to one of the first and second clock signals in response to receiving at least one of the first and second SFQ pulses.