CMOS Stress Sensor Offset Compensation Circuit
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Solution Overview
Problem
Integrated CMOS stress sensors face limitations in application areas due to sensitivity requirements, leading to initial stress-induced saturation, which affects their functionality and spatial resolution.
Innovation Solution
A circuit arrangement with an offset compensation circuit dynamically adjusts the sensor signal's zero point using electrical compensation signals, allowing for adjustable sensitivity and avoiding saturation, thereby expanding the range of applications without requiring new sensor chip development.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If high sensitivity is used in CMOS stress sensors, then measurement precision is improved, but initial stress causes saturation of the sensor signal
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting the zero point of the sensor signal through an offset compensation circuit. This circuit modifies the electrical parameters (voltage offset) of the sensor system to counteract initial stress effects, allowing the sensor to operate within its optimal detection range even with high sensitivity settings.
Solution Approach 2:
The patent implements feedback through an automatic offset compensation mechanism that continuously monitors the sensor signal and adjusts the zero point accordingly. The evaluation circuit determines the mechanical stress and feeds this information back to the offset compensation circuit, which then applies the appropriate compensation signal to maintain reliable operation.
2Adaptability or versatility
If the zero point of the sensor signal is not adjusted, then the sensor operates with fixed sensitivity, but saturation occurs reducing the dynamic measuring range
Solution Approach 1:
The patent applies dynamics by making the zero point adjustment dynamic rather than static. The offset compensation circuit can automatically adapt the zero point during ongoing measurement operations based on real-time sensor signal conditions, enabling the system to handle varying stress levels and maintain optimal detection range across different operating conditions.
Solution Approach 2:
The patent changes the electrical parameter (zero point offset) dynamically to expand the effective measuring range. By adjusting the offset compensation signal, the system can shift the operating point of the sensor to utilize the full dynamic range available, preventing saturation while maintaining measurement precision.
3Reliability
If offset compensation is implemented, then saturation is prevented and reliability is improved, but device complexity increases
Solution Approach 1:
The patent merges the offset compensation functionality with the existing sensor evaluation circuit. The offset compensation circuit is integrated into the same chip as the CMOS stress sensor and shares common components and signal paths, thereby reducing the overall device complexity compared to a separate standalone compensation system.
Solution Approach 2:
The patent implements self-service through an automatic offset compensation mechanism that operates autonomously without requiring external intervention. The evaluation circuit automatically determines the mechanical stress and triggers the appropriate compensation action, eliminating the need for manual calibration or external control systems.
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
This solution enables reliable stress detection across a broader range of applications, improving sensitivity by a factor of 3 compared to state-of-the-art sensors and preventing saturation, thus enhancing the dynamic measuring range and operational reliability.
Implementation Method 1
the circuit arrangement has at least one offset compensation circuit configured to set the zero point of the sensor signal of the at least one stress sensor to a desired value by applying an electrical compensation signal to the at least one stress sensor
Data Source
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AI summary
The invention relates to a circuit arrangement for controlling at least one stress sensor, wherein the circuit arrangement has an evaluation circuit configured to determine a sensor signal from the stress sensor that represents a mechanical stress detected by the stress sensor at the installation location of the stress sensor. The invention further relates to a stress mapping system with a plurality of stress sensors and such a circuit arrangement.