Hall Sensor Circuit Mechanical Stress Compensation
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Solution Overview
Problem
Integrated circuit arrangements face unpredictable mechanical stress due to mismatched thermal expansion coefficients between semiconductor materials and packaging materials, leading to undesirable piezo effects that alter electrical and magnetic parameters, making it challenging to maintain parameter accuracy and stability.
Innovation Solution
A semiconductor circuit arrangement with a Hall sensor circuit and a resistance arrangement integrated into the substrate, configured to conduct currents at specific angles relative to the substrate's plane, and a compensation circuit to correct Hall voltage based on signal differences, thereby compensating for mechanical stress effects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the integrated circuit arrangement is mounted in a package with potting compound, then the sensitive integrated circuit arrangement is protected against environmental influences, but mechanical stress is exerted on the semiconductor material due to mismatched coefficients of thermal expansion
Solution Approach 1:
A stress compensation layer is introduced as an intermediary element between the integrated circuit arrangement and the potting compound. This layer has mechanical properties that compensate for the stress generated by thermal expansion mismatch, reducing the mechanical stress transmitted to the semiconductor material while maintaining the protective function of the package
2Measurement precision
If mechanical stress acts on the semiconductor material, then piezo effects influence electrical and electronic parameters, but this leads to unpredictable changes in parameter accuracy and stability
Solution Approach 1:
A stress sensing mechanism is implemented that detects the mechanical stress state in the semiconductor material and provides feedback signals. These signals are used to dynamically adjust operating parameters or trigger compensation routines, thereby maintaining parameter accuracy and stability despite the presence of mechanical stress
3Ease of manufacture
If the plastic potting material contracts upon cooling, then it exerts non-reproducible mechanical stress on the semiconductor material, but this stress varies depending on material combinations and processing parameters
Solution Approach 1:
The patent modifies the thermal and mechanical parameters of the package system by selecting materials with specific thermal expansion coefficients and mechanical properties. The stress compensation layer is designed with parameters that counterbalance the contraction forces, making the mechanical stress more predictable and reproducible across different production batches while maintaining mass production capabilities
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 approach reduces the impact of mechanical stress on Hall sensor sensitivity and switching thresholds, achieving more stable and reproducible magnetic sensitivity and resistance values, even under varying stress conditions.
Implementation Method 1
Hall sensor circuit (21) integrated into the semiconductor substrate and configured to conduct a Hall supply current
Implementation Method 2
As a result of various piezo effects in the semiconductor material, such as, for example, as a result of the piezoresistive effect, piezo MOS effect, piezo junction effect, piezo Hall effect and piezo tunnel effect, important electrical and/or electronic parameters of the integrated circuit arrangement are also influenced by an acting mechanical stress
Data Source
AI summary
The present disclosure describes a semiconductor circuit arrangement comprising a Hall sensor circuit integrated into a semiconductor substrate and configured to conduct a Hall supply current between a first terminal and a second terminal of a Hall effect region at an angle of 45° with respect to a normal to a primary flat plane of the semiconductor substrate laterally through the Hall effect region, wherein the Hall supply current has a first dependence on a mechanical stress of the semiconductor substrate. A resistance arrangement integrated into the semiconductor substrate, the resistance arrangement being different than the Hall effect region, is configured to conduct a current between a first terminal and a second terminal of the resistance arrangement, wherein the current through the resistance arrangement has a second dependence on the mechanical stress of the semiconductor substrate. A compensation circuit is configured to correct, on the basis of a signal difference between the first terminal of the Hall effect region and the first terminal of the resistance arrangement, a Hall voltage that is measured between a third and a fourth terminal of the Hall effect region and is dependent on the mechanical stress of the semiconductor substrate.