SQUID Diagnostic Circuit for Cryogenic Noise Isolation
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Solution Overview
Problem
Conventional methods for analyzing electronic noise in cryogenic CMOS circuits introduce thermal noise when signals are transmitted from cryogenic to room temperature, making it difficult to isolate noise sources.
Innovation Solution
A diagnostic circuit using a superconducting quantum interference device (SQUID) coupled to a test circuit, generating distinct voltages based on the sum of induced and controlled currents, allowing for noise characterization without introducing thermal noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If signals are transmitted from cryogenic environment to room temperature for noise analysis, then noise can be detected with room temperature equipment, but thermal noise is introduced that obscures the original cryogenic noise
Solution Approach 1:
The patent introduces a superconducting diagnostic circuit as an intermediary between the cryogenic test circuit and the room temperature measurement equipment. This intermediary operates at cryogenic temperatures and converts the noise signal into a form that can be read out without thermal interference, effectively mediating between the cryogenic environment and room temperature equipment while preserving signal integrity.
Solution Approach 2:
The patent replaces the conventional approach of transmitting signals through thermal gradients with a superconducting-based detection system. By using superconducting quantum interference devices (SQUIDs) and superconducting wires, the system substitutes thermal transmission mechanisms with quantum mechanical effects that operate at cryogenic temperatures, eliminating thermal noise introduction.
2Device complexity
If conventional room temperature equipment is used to analyze cryogenic noise, then equipment complexity is reduced, but the ability to isolate cryogenic noise from thermal noise deteriorates
Solution Approach 1:
The patent segments the measurement system into two distinct parts: a cryogenic diagnostic circuit that operates at cryogenic temperatures and a room temperature readout system. This segmentation allows the sensitive noise detection to occur at cryogenic temperatures while the complex signal processing and analysis can be performed at room temperature, dividing the system complexity into manageable functional segments.
Solution Approach 2:
The superconducting diagnostic circuit serves as an intermediary that bridges the cryogenic and room temperature environments. It converts cryogenic noise signals into a format suitable for room temperature readout, effectively isolating the noise analysis function from the thermal environment and enabling precise noise source identification without requiring entirely cryogenic equipment.
3Measurement precision
If signals are read out directly from cryogenic environment, then thermal noise introduction is minimized, but the complexity of maintaining cryogenic measurement systems increases
Solution Approach 1:
The superconducting diagnostic circuit is designed to be self-contained and self-sufficient at cryogenic temperatures. It automatically detects, processes, and prepares noise signals for readout without requiring external cryogenic equipment or complex control systems. The circuit self-regulates and maintains its operation at cryogenic temperatures, reducing the overall system complexity while preserving measurement precision.
Solution Approach 2:
The patent replaces complex cryogenic signal transmission and processing systems with a superconducting-based diagnostic circuit that inherently operates at cryogenic temperatures. By using superconducting quantum interference devices and superconducting wires, the system eliminates the need for complex thermal management and signal conditioning equipment, simplifying the overall system while maintaining precise noise measurement capability.
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
Enables accurate identification of electronic noise in cryogenic environments by isolating noise sources through binary output transitions, unaffected by thermal noise from room temperature environments.
Implementation Method 1
a superconducting quantum interference device (SQUID) configured to be coupled to a test circuit such that an electronic noise present in the test circuit induces a first current that flows through the SQUID
Implementation Method 2
a superconducting quantum interference device (SQUID) configured to be coupled to a test circuit such that an electronic noise present in the test circuit induces a first current that flows through the SQUID
Data Source
AI summary
A diagnostic circuit includes a superconducting quantum interference device (SQUID) configured to be coupled to a test circuit such that an electronic noise present in the test circuit induces a first current that flows through the SQUID. The diagnostic circuit also includes a current path configured to receive a second current that flows through the SQUID. The SQUID is configured to generate an output in a form of: a first voltage in response to a sum of the first current and the second current being less than a threshold current and a second voltage in response to the sum of the first current and the second current being greater than the threshold current.