Multistage Superconducting Feed Network for Uniform Signal Distribution
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Distributing signals, such as power and clock signals, to large-scale superconducting circuits is challenging due to parasitic modes, amplitude, and phase variations, as well as fabrication limitations related to power distribution, logic efficiency, and memory density.
Innovation Solution
A multistage feed network is introduced, comprising multiple stages with two-port networks for impedance matching, and mesh networks to minimize signal amplitude and phase deviations. This network is integrated into the superconducting system fabrication process, allowing for efficient signal distribution and improved manufacturing simplicity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If a conventional signal distribution network is used in large-scale superconducting circuits, then the circuit scale can be expanded, but parasitic modes and signal amplitude/phase variations increase
Solution Approach 1:
The feed network is divided into multiple stages, with each stage responsible for distributing signals to a specific subset of tiles. This segmentation prevents parasitic modes from affecting the entire circuit while maintaining signal quality in each local region. Each stage operates independently with its own impedance matching networks, isolating signal distribution issues to manageable sections.
Solution Approach 2:
The patent transitions from a planar signal distribution architecture to a three-dimensional multistage architecture. By adding the stage dimension vertically, signals can be distributed through multiple levels rather than spreading horizontally across a single plane, reducing parasitic coupling and maintaining signal integrity as circuit scale increases.
2Adaptability or versatility
If signal distribution networks are added to feed the superconducting circuit, then the circuit functionality is improved, but the device complexity increases
Solution Approach 1:
The multistage feed network is designed to perform multiple functions: signal distribution, impedance matching, and parasitic suppression, all within a unified architecture. Each stage simultaneously achieves signal routing to multiple tiles while providing impedance transformation and filtering, reducing the need for separate dedicated components for each function.
Solution Approach 2:
The feed network employs a nested hierarchical structure where smaller feed networks are embedded within larger stages. Each stage contains multiple two-port networks that are nested within the overall multistage architecture, allowing complex signal distribution to be built from simpler modular units, thereby managing complexity through hierarchical organization.
3Manufacturing precision
If Josephson junctions are formed in separate layers from other circuit components, then manufacturing precision is improved, but fabrication complexity increases
Solution Approach 1:
The fabrication process is segmented into distinct layers: Josephson junction layers and feed network layers. This segmentation allows each layer to be optimized and fabricated independently with specialized processes, ensuring high precision for Josephson junctions while simplifying the overall manufacturing by breaking down the complex task into manageable, sequential steps.
Solution Approach 2:
The feed network structure is preliminarily formed in the fabrication stack before Josephson junctions are created. This preliminary action establishes the signal distribution infrastructure in advance, allowing Josephson junctions to be fabricated separately and then integrated, thereby improving manufacturing precision for both components while organizing fabrication complexity in a logical sequence.
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 multistage feed network effectively suppresses parasitic modes and maintains uniform signal amplitude and phase, enhancing the performance of superconducting circuits by improving signal distribution and simplifying the fabrication process.
Implementation Method 1
said one of the plurality of two-port networks is configured to perform impedance matching between said stage and its immediate subsequent stage
Implementation Method 2
at least one stage of the number N stages comprises a mesh network made of interconnected superconducting wires
Data Source
AI summary
According to an aspect of the present inventive concept there is provided a multistage feed network for distributing a signal stage by stage for feeding a superconducting circuit. The multiple stages of the multistage feed network are arranged in a sequential order, and a plurality of two-port networks are configured to connect to two adjacent stages in between for impedance matching. At least one stage comprises a mesh network made of interconnected superconducting wires such that incoming signal(s) of said stage can be distributed to the outgoing signals of said stage by said mesh network with a minimal deviation of signal amplitude and of signal phase.