Hall Effect Sensor Metal Layer Interconnects for Uniform Current Distribution
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Solution Overview
Problem
Existing Hall effect sensors face challenges in accurately calibrating and measuring magnetic fields due to uneven current distribution and magnetic field strength across multiple wells, which affects the reliability of magnetic field detection.
Innovation Solution
The Hall effect sensor design includes a semiconductor substrate with multiple wells and a metal layer forming interconnects and traces to evenly distribute an applied current across the wells, ensuring each well experiences the same magnetic field strength and direction through a carefully configured layout and electrical coupling of terminals and ohmic contacts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple wells are used in the Hall effect sensor, then the magnetic field detection capability is improved, but the current distribution becomes uneven across wells
Solution Approach 1:
The patent divides the current distribution problem into separate manageable segments by providing individual interconnects for each well. Each interconnect is independently configured to deliver current to its associated well, allowing precise control of current distribution across multiple wells rather than relying on a single shared current path.
Solution Approach 2:
The patent applies local quality by configuring each interconnect with specific trace layouts and dimensions tailored to the requirements of its associated well. The interconnects can have different geometries, materials, or configurations optimized for local current distribution needs of each well, ensuring uniform current density across all wells.
2Measurement precision
If multiple wells are used in the Hall effect sensor, then the magnetic field detection capability is improved, but the magnetic field strength varies across wells
Solution Approach 1:
The patent segments the magnetic field generation function by providing separate interconnects for each well. This allows independent optimization and control of current delivery to each well, ensuring that each well experiences a consistent and controlled magnetic field strength during calibration and operation.
Solution Approach 2:
The patent achieves equipotentiality in terms of magnetic field exposure by configuring interconnects to deliver equal current to each well. The trace layouts and interconnect designs are optimized to ensure that all wells are exposed to the same magnetic field strength and direction, creating uniform calibration conditions across the sensor array.
3Device complexity
If interconnects and traces share the same metal layer, then the device complexity is reduced, but electrical isolation becomes challenging
Solution Approach 1:
The patent introduces an intermediary insulating structure (dielectric layer or isolation trench) between the interconnect and trace within the same metal layer. This intermediary element enables electrical isolation while maintaining the simplicity of a single metal layer architecture, allowing both interconnect and trace functions to coexist without direct electrical contact.
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 design allows for precise calibration and measurement of magnetic fields by ensuring consistent magnetic field exposure across all wells, enhancing the accuracy and reliability of the Hall effect sensor's magnetic field detection capabilities.
Implementation Method 1
a Hall effect sensor develops a voltage (potential difference) in response to an applied current in one or more (semiconductor) wells, where the magnetic field has a non-zero component in the one or more wells
Data Source
AI summary
A Hall effect sensor comprises a semiconductor substrate, a first well formed in the semiconductor substrate, a first ohmic contact formed in the first well, a second ohmic contact formed in the first well, a first terminal electrically coupled to the first ohmic contact, a second terminal electrically coupled to the second ohmic contact, and a first metal layer formed over the semiconductor substrate. The first metal layer comprises a first interconnect and a first trace, where the first trace is formed over the first well, and where the first interconnect electrically couples a first part of the first well to a second part of the first well. The first and second ohmic contacts are each positioned between the first part and the second part of the first well, where the first interconnect is electrically isolated from the first trace.