Semiconductor Stress Detection Circuit with Calibration
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Solution Overview
Problem
Existing electronic circuits and semiconductors in critical applications face challenges in accurately monitoring and compensating for mechanical stress, which can lead to inaccurate measurements and potentially dangerous failures, especially when stress levels exceed the normal operating range.
Innovation Solution
A detection circuit with a stress monitor module, reference module, and calibration module that generates an activation signal based on the mechanical stress level, allowing for compensation and triggering safety measures such as power reduction or system reset when stress thresholds are exceeded, using calibration information stored in non-volatile memory and considering temperature effects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If stress compensation measurement circuitry is added to improve measurement accuracy, then measurement precision is improved, but device complexity and cost increase
Solution Approach 1:
The patent combines the stress compensation measurement circuitry with the main semiconductor circuit onto a single substrate. The detection circuit integrates stress sensing elements, measurement circuitry, and the main circuit functions into one unified structure, eliminating the need for separate substrates while maintaining independence through careful layout and isolation techniques.
Solution Approach 2:
The detection circuit serves multiple functions: it monitors mechanical stress levels, generates activation signals when thresholds are exceeded, and provides stress compensation for other sensors. This multi-functional approach consolidates what would otherwise require separate dedicated circuits, reducing overall system complexity.
2Reliability
If separate substrates are used to avoid coupling effects and achieve independence, then reliability is improved, but manufacturing complexity and cost increase
Solution Approach 1:
The patent segments the substrate into distinct functional regions: a first region for the main semiconductor circuit and a second region for the detection circuit. These regions are spatially separated and electrically isolated through deep trenches or other isolation structures, ensuring independence while remaining on the same substrate for simplified manufacturing.
Solution Approach 2:
The patent introduces isolation structures (such as deep trenches filled with insulating material) as intermediaries between the main circuit and detection circuit. These intermediary elements prevent electrical coupling and mechanical stress transfer between the two circuits, achieving independence without requiring separate substrates.
3Reliability
If stress resistant housing is used to avoid stress, then reliability is improved, but cost increases significantly
Solution Approach 1:
The detection circuit monitors the mechanical stress experienced by the semiconductor circuit and enables the system to take protective actions when stress thresholds are exceeded. This self-monitoring and self-protecting mechanism eliminates the need for expensive stress-resistant housing, as the system adapts to stress conditions rather than requiring passive protection.
Solution Approach 2:
The patent implements a feedback loop where the detection circuit continuously monitors stress levels and provides activation signals to control systems. This real-time feedback enables dynamic stress management, allowing the system to respond to stress conditions and maintain reliability without requiring over-engineered stress-resistant packaging.
4Measurement precision
If calibration information is stored in non-volatile memory and updated during manufacturing, then measurement precision is improved, but manufacturing time and complexity increase
Solution Approach 1:
The patent performs stress calibration and compensation parameter determination during the manufacturing process, specifically during end-of-line testing. Calibration information is stored in non-volatile memory before the product is shipped, enabling precise stress compensation from the first use without requiring field calibration or additional manufacturing steps.
Data Source
AI summary
A circuit, a method, and a computer program configured to detect mechanical stress and a circuit, a method, and a computer program configured to monitor safety of a system is disclosed. The detection circuit is configured to monitor a mechanical stress level of a semiconductor circuit. The detection circuit includes a stress monitor circuit configured to monitor a signal comprising mechanical stress level information of the semiconductor circuit, a reference circuit to generate a reference signal, and a calibration circuit configured to modify at least one of the stress signal or the reference signal based on calibration information for the semiconductor circuit to obtain a at least one modified signal. The detection circuit further includes an activation signal generator configured to generate an activation signal including activation information related to the mechanical stress level of the semiconductor circuit depending on a relation between the modified signal, and the stress signal or the reference signal.