Gate-Controlled Hall Sensor Tuning for Environmental Drift
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Solution Overview
Problem
Existing Hall sensors face challenges in dynamically adjusting sensitivity, resistance, offset, noise, and bandwidth due to variations with environmental conditions such as temperature and stress, limiting their performance in various applications.
Innovation Solution
A semiconductor device with a Hall well and four terminals, featuring a dielectric layer and an electrode layer, allows for dynamic modulation of performance characteristics through a second bias signal applied to the electrode layer, enabling adjustment of sensitivity, resistance, offset, and noise based on environmental conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If Hall sensor properties are kept static for a given construction, then manufacturing simplicity is maintained, but adaptability to varying environmental conditions deteriorates
Solution Approach 1:
The patent applies the dynamics principle by introducing a control electrode that can dynamically modulate the Hall sensor's properties. The control electrode applies an electric field to the implanted region, enabling real-time adjustment of sensitivity, resistance, offset, noise, and bandwidth in response to environmental conditions such as temperature and stress changes, thus transforming the static sensor into a dynamically adjustable system.
Solution Approach 2:
The patent implements parameter changes by using the control electrode to alter the electrical parameters of the Hall sensor. By applying different voltages to the control electrode, the sensor's sensitivity, resistance, offset, noise, and bandwidth can be tuned to optimal values for specific operating conditions, allowing the same physical construction to exhibit different electrical characteristics as needed.
2Reliability
If Hall sensor properties are dynamically adjusted, then performance under varying conditions is improved, but device complexity increases
Solution Approach 1:
The control electrode structure enables dynamic adjustment of sensor properties while maintaining reliability. The electrode is integrated into the sensor construction and can be controlled by external circuits to stabilize performance under varying temperature and stress conditions, ensuring consistent operation across different environmental scenarios.
Solution Approach 2:
The control electrode acts as an intermediary element between the external control circuitry and the Hall sensor's active region. It mediates the adjustment of sensor properties by applying electric fields to the implanted region, allowing external control signals to influence internal sensor characteristics without direct modification of the sensing elements themselves.
3Adaptability or versatility
If additional control structures are added to Hall sensor, then performance control capability is improved, but manufacturing complexity increases
Solution Approach 1:
The sensor construction is segmented into distinct functional regions: the Hall sensing region with implanted dopants, the control electrode structure with dielectric layer, and the terminal structures. This segmentation allows each component to be optimized and fabricated using standard semiconductor processes, making the enhanced sensor compatible with existing manufacturing workflows.
Solution Approach 2:
The control electrode structure serves multiple functions: it controls sensitivity, adjusts resistance, compensates for offset, reduces noise, and extends bandwidth. By integrating this multi-functional element into the sensor design, the same basic construction can be used across different applications by simply adjusting control voltages rather than designing different sensors for different requirements.
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 tailored performance of Hall sensors to accommodate specific operating conditions, providing enhanced control over sensitivity, resistance, offset, and noise, and allowing for dynamic adjustment to environmental changes.
Implementation Method 1
A magnetic field in the implanted region interacts with bias current flow to generate the Hall voltage through Lorentz force interactions
Implementation Method 2
the electrode layer is used to dynamically modulate the Hall sensor's performance by applying a bias signal
Data Source
AI summary
A Hall sensor includes a Hall well, such as an implanted region in a surface layer of a semiconductor structure, and four doped regions spaced apart from one another in the implanted region. The implanted region and the doped regions include majority carriers of the same conductivity type. The sensor also includes a dielectric layer that extends over the implanted region, and an electrode layer over the dielectric layer to operate as a control gate to set or adjust the sensor performance. A first supply circuit provides a first bias signal to a first pair of the terminals, and a second supply circuit provides a second bias signal to the electrode layer.