Hall Effect Sensor Devices Reducing Offset Voltage
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing Hall effect sensor devices suffer from high signal-to-noise ratios and offset/residual voltages due to resistance mismatch between different regions caused by varying depletion widths of p-n junctions, which are sensitive to temperature changes and external voltages.
Innovation Solution
A Hall effect sensor device with a base layer of one conductivity type, a Hall plate region of opposite conductivity type, and isolating regions made of electrically insulating material, where the Hall plate region is surrounded by a first isolating region and contains second isolating regions that electrically isolate terminal regions, reducing current flow and p-n junctions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If intermediate regions of opposite conductivity type are arranged between neighboring terminals, then the Hall plate structure is formed, but resistance mismatch occurs due to varying depletion widths of p-n junctions
Solution Approach 1:
The patent removes the intermediate regions of opposite conductivity type from between the terminals. By extracting these problematic p-n junctions, the design eliminates the source of varying depletion widths that cause resistance mismatch, while still maintaining the necessary Hall plate functionality through alternative terminal configurations.
Solution Approach 2:
The patent applies different conductivity type regions selectively at specific locations rather than uniformly throughout. By placing intermediate regions only where needed for specific terminal isolation or protection, rather than between all terminal pairs, the design achieves local optimization that reduces overall resistance mismatch while maintaining necessary structural integrity.
2Device complexity
If intermediate regions are arranged between terminals, then the Hall plate is formed, but signal-to-noise ratio and offset voltage increase due to depletion width variations
Solution Approach 1:
The patent extracts and removes the intermediate regions that create problematic p-n junctions between terminals. By eliminating these regions, the design removes the source of depletion width variations that degrade signal-to-noise ratio and increase offset voltage, thereby improving measurement precision.
Solution Approach 2:
The patent changes the conductivity type parameters of the intermediate regions to match the Hall plate conductivity type rather than using opposite conductivity types. This parameter change eliminates the formation of p-n junctions and their associated depletion widths, directly improving signal-to-noise ratio and reducing offset voltage.
3Device complexity
If p-n junctions are present in the Hall plate, then the intermediate regions are formed, but sensitivity to temperature changes and external voltages increases
Solution Approach 1:
The patent removes the intermediate regions of opposite conductivity type that create temperature-sensitive p-n junctions. By extracting these regions, the design eliminates the primary source of temperature sensitivity and voltage dependence, improving the stability of the Hall plate's electrical characteristics under varying environmental conditions.
Solution Approach 2:
The patent changes the conductivity type of intermediate regions to match the Hall plate, transforming them from p-n junction interfaces to homotype regions. This parameter change eliminates the temperature and voltage sensitivity associated with depletion width variations in p-n junctions, stabilizing the device composition.
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 configuration minimizes resistance mismatch, reduces sensitivity to temperature changes and external voltages, and lowers offset voltage, improving the device's signal quality and accuracy in measuring magnetic fields.
Implementation Method 1
In the presence of a magnetic field perpendicular to the plane of the Hall plate, Lorentz forces may be exerted on the charge carriers in the electric currents. This may produce a Hall voltage within the Hall plate.
Implementation Method 2
In the presence of a magnetic field perpendicular to the plane of the Hall plate, Lorentz forces may be exerted on the charge carriers in the electric currents.
Data Source
AI summary
A Hall effect sensor device may be provided, including one or more sensor structures. Each sensor structure may include: a base layer having a first conductivity type; a Hall plate region having a second conductivity type opposite from the first conductivity type arranged above the base layer; a first isolating region arranged around and adjoining the Hall plate region, and contacting the base layer; a plurality of second isolating regions arranged within the Hall plate region; and a plurality of terminal regions arranged within the Hall plate region. The first and second isolating regions may include electrically insulating material, and each neighboring pair of terminal regions may be electrically isolated from each other by one of the second isolating regions.