Vertical Hall Element with Constant-Field Offset Removal
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Solution Overview
Problem
Vertical Hall elements experience significant challenges in accurately removing offset voltages due to structural asymmetry and manufacturing variations, which are exacerbated by the difficulty in achieving geometric symmetry in the vertical direction of semiconductor processes.
Innovation Solution
The vertical Hall element is designed with a first electrode group and a high-resistance diffusion layer of a specific conductivity type, accompanied by a second electrode group that maintains a constant electric field distribution, ensuring the depletion layer width remains consistent across different current flow phases, thereby enhancing offset voltage removal accuracy using the spinning current method.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a vertical Hall element is formed using conventional semiconductor processes, then the element can be manufactured, but structural asymmetry and manufacturing variations cause significant offset voltages that cannot be accurately removed
Solution Approach 1:
The invention applies equipotentiality by introducing a constant electric field through the high-resistance diffusion layer and second electrode group. This creates a controlled potential distribution that compensates for structural asymmetries, ensuring that offset voltages caused by manufacturing variations are minimized and can be accurately removed through the spinning current method.
Solution Approach 2:
The invention changes the electrical parameters by introducing a constant electric field through the high-resistance diffusion layer. By controlling the electric field strength and distribution, the invention optimizes the offset voltage removal accuracy without requiring perfect geometric symmetry in the manufacturing process.
2Measurement precision
If the depletion layer width varies across different current flow phases, then the spinning current method cannot accurately remove offset voltages, but maintaining constant depletion layer width requires additional structural components
Solution Approach 1:
The high-resistance diffusion layer serves multiple functions: it maintains constant depletion layer width across different current flow phases, provides a controlled electric field for offset voltage compensation, and works integrally with the spinning current method. This multi-functionality achieves high measurement precision without proportionally increasing device complexity.
3Measurement precision
If geometric symmetry is difficult to achieve in the vertical direction of semiconductor processes, then offset voltage removal accuracy deteriorates, but adding compensating structures increases device complexity
Solution Approach 1:
The high-resistance diffusion layer acts as an intermediary that mediates between the structural asymmetries inherent in vertical semiconductor processes and the requirement for accurate offset voltage removal. By introducing this intermediate layer with controlled electrical properties, the invention achieves high measurement precision without requiring complex compensating structures.
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 allows for precise removal of offset voltages with high accuracy by maintaining consistent depletion layer widths, improving the magnetic sensitivity and overall performance of the vertical Hall element.
Implementation Method 1
a second electrode group capable of being applied with a voltage such that an electric field with respect to the first electrode group becomes constant
Implementation Method 2
a vertical Hall element which detects a magnetic field component parallel to the surface of the semiconductor substrate
Data Source
AI summary
A vertical Hall element includes: an N-type epitaxial layer formed on a surface of a P-type semiconductor substrate; a first electrode group disposed on a surface of the N-type epitaxial layer and formed of three or more electrodes; and a P-type high-resistance diffusion layer disposed in a ring shape on an outer periphery separated from the first electrode group and including a second electrode group capable of being applied with a voltage such that an electric field with respect to the first electrode group becomes constant.