On-Die Cosmic Ray Detector for Soft Error Mitigation
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Solution Overview
Problem
Cosmic ray-induced soft errors pose a significant reliability challenge for semiconductor integrated circuit chips, particularly as device sizes decrease, leading to increased sensitivity and potential computer crashes, with existing shielding methods being impractical and current mitigation approaches being costly or ineffective.
Innovation Solution
Incorporating an on-chip cosmic ray detector system with an array of thin wires and amplifiers to detect high mobility electrons/holes, allowing for the localization and management of cosmic ray events, enabling self-repair mechanisms and reducing soft errors without extensive redundancy or performance penalties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If shielding devices are used to protect from cosmic rays, then reliability is improved, but device complexity and cost increase significantly
Solution Approach 1:
The patent replaces physical shielding (mechanical/structural approach) with an electronic detection and correction system. Instead of using tens of meters of concrete to block cosmic rays, the invention uses on-chip sensors to detect ionizing particles and electronic circuits to identify and correct soft errors, thereby resolving the contradiction between reliability improvement and device complexity.
Solution Approach 2:
The patent introduces intermediary detection components (charge-coupled devices, sensors) that detect cosmic ray interactions before they cause critical failures. These intermediaries enable the system to identify and correct soft errors without requiring extensive physical shielding, thus improving reliability while avoiding excessive complexity.
2Reliability
If redundancy is added to protect logic circuits from soft errors, then reliability is improved, but area and cost increase
Solution Approach 1:
The patent extracts the error detection and correction functionality from the main logic circuits and implements it through separate on-chip sensors and detection circuits. This allows the logic circuits to operate normally while the extracted detection system monitors for cosmic ray effects, improving reliability without requiring redundant logic elements that would consume additional chip area.
Solution Approach 2:
The patent implements self-service error correction where the system automatically detects and corrects soft errors without external intervention. The on-chip sensors continuously monitor for ionizing particles, and the detection circuits automatically identify affected bits and trigger correction mechanisms, maintaining high reliability without the need for extensive manual redundancy or verification circuits.
3Productivity
If device size is decreased to increase integration, then productivity is improved, but sensitivity to cosmic rays increases
Solution Approach 1:
The patent applies preliminary action by placing on-chip sensors and detection circuits that proactively monitor for cosmic ray interactions before they can cause critical failures. The sensors are positioned to detect ionizing particles as they pass through the chip, enabling early detection and correction of soft errors, thus allowing high integration density without increased vulnerability to cosmic rays.
Solution Approach 2:
The patent implements feedback mechanisms where the on-chip sensors continuously monitor for cosmic ray effects and provide real-time information to correction circuits. When a soft error is detected, the feedback loop triggers automatic correction, enabling the system to maintain high integration density while compensating for increased cosmic ray sensitivity through active monitoring and correction.
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 on-chip cosmic ray detector system effectively identifies and mitigates soft errors by resetting affected circuits, refreshing cache, and restarting instructions, thereby enhancing chip reliability and reducing the occurrence of cosmic ray-induced crashes without significant increases in power, area, or cost.
Implementation Method 1
A random signal may be registered if this collected charge exceeds a critical threshold value... generating in its wake electron-hole pairs at a rate of one pair per 3.6-eV (electron-volts) loss of energy
Data Source
AI summary
Described is a chip comprising: a substrate; a logic unit forming an active circuit on the substrate; and a cosmic ray detector embedded in the substrate, the cosmic ray detector to detect a cosmic ray and to generate a signal indicating detection of the cosmic ray, the signal for reducing error in the logic unit.