Optical Charge-Density Diagnostics for Noise-Sensitive Small Circuits
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current techniques for monitoring small circuits, particularly in extreme thermal environments, are noise-sensitive and require significant circuit board area, making them inefficient and thermally costly.
Innovation Solution
A diagnostic system that applies electric fields to test sites within an active layer of a circuit, illuminates sensor sites with crystallographic defects in a sensor layer aligned with the test sites, and measures photoluminescence intensities to determine charge densities, using a system comprising processors, electrodes, light sources, photodetectors, and a user interface.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional electronic charge sensors are used to monitor circuits, then charge detection capability is achieved, but noise sensitivity increases and circuit board area occupation increases
Solution Approach 1:
The patent replaces traditional electronic charge sensing mechanisms with an optical detection system. A sensor layer containing crystallographic defects (such as nitrogen-vacancy centers in diamond) is positioned near the circuit, and these defects exhibit photoluminescence properties that change in response to electric fields from charge carriers. Optical detection methods are used instead of electronic readout, which eliminates noise sensitivity issues inherent in electronic systems while maintaining charge detection capability.
2Measurement precision
If traditional electronic charge sensors are used to monitor circuits, then charge detection capability is achieved, but circuit board area occupation increases
Solution Approach 1:
The patent uses a sensor layer that acts as an optical copy or proxy for detecting charge states. Instead of using large electronic readout circuits and wire routings on the circuit board, a thin sensor layer with crystallographic defects is positioned close to the circuit under test. The photoluminescence signal from these defects provides information about charge densities without requiring extensive circuit board real estate.
Solution Approach 2:
The patent transitions from a planar electronic sensing approach to a three-dimensional configuration where the sensor layer is positioned in close proximity to the circuit under test. This vertical stacking approach allows charge detection without expanding the horizontal circuit board area, as the sensor layer operates in a different spatial dimension (close proximity in the Z-direction rather than lateral expansion in the XY-plane).
3Measurement precision
If measurement currents are increased for electronic readout in cryogenic environments, then signal detection improves, but thermal budget consumption increases
Solution Approach 1:
The patent replaces electronic readout processes that require measurement currents with optical detection methods. The sensor layer's photoluminescence signal is detected using optical systems rather than electronic amplification, eliminating the need for large measurement currents that would generate heat and consume thermal budget in cryogenic environments.
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 efficient monitoring of charge densities in small circuits with reduced noise sensitivity and thermal impact, optimizing circuit board space and thermal budget.
Implementation Method 1
determining intensities of photoluminescence detected from the crystallographic defects of the sensor sites
Data Source
AI summary
A method of operating a diagnostic system includes applying electric fields to test sites within an active layer of a circuit and illuminating sensor sites within a sensor layer of the circuit. The sensor layer comprises crystallographic defects and the sensor sites are respectively aligned with the test sites. The method also includes determining intensities of photoluminescence detected from the crystallographic defects of the sensor sites. The intensities correspond to a frequency range of photoluminescence that is indicative of charge densities within the test sites. The method also includes generating output indicating the intensities at each of the sensor sites.