Magnetic Sensor Bridge Circuit Noise Suppression
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current magnetic sensors face challenges in achieving high sensitivity for detecting external magnetic fields due to noise interference and limited sensitivity in detecting biological magnetic fields such as neuromagnetism and cardiomagnetism.
Innovation Solution
The magnetic sensor design incorporates a configuration with multiple magnetic parts and elements, including magnetic layers and nonmagnetic layers, arranged to concentrate external magnetic fields and apply alternating current magnetic fields, forming a bridge circuit to suppress noise and enhance sensitivity. This configuration includes specific orientations and overlapping conductive members to optimize magnetic field detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a conventional magnetic sensor with a single magnetic layer is used, then the device complexity is low, but the sensitivity for detecting external magnetic fields is insufficient
Solution Approach 1:
The magnetic sensor is divided into multiple magnetic parts (first magnetic part with first-second-third portions, second magnetic part with fourth-fifth-sixth portions) arranged in specific spatial configurations. Each magnetic part contains multiple magnetic layers (first element with first magnetic layer, second element with second magnetic layer, etc.) that work together to enhance the overall sensitivity while maintaining manageable complexity through modular segmentation.
Solution Approach 2:
The patent introduces spatial dimensionality by arranging magnetic parts in three-dimensional space with specific orientations. The first magnetic part and second magnetic part are positioned at different locations, and conductive members overlap in vertical stacking, creating a multi-dimensional detection architecture that improves sensitivity without simply increasing the number of components linearly.
2Measurement precision
If magnetic sensor components are arranged to concentrate external magnetic fields, then the sensitivity increases, but the noise interference also increases
Solution Approach 1:
The patent converts the harmful effect of noise interference into a beneficial differential measurement approach. By arranging multiple magnetic parts and elements in a bridge circuit configuration, the sensor detects the difference in magnetic field effects between opposing components, which cancels out common-mode noise while preserving the signal of interest, thereby improving signal-to-noise ratio.
Solution Approach 2:
The bridge circuit acts as an intermediary mechanism between the magnetic field detection elements and the output signal. It processes the raw signals from multiple magnetic layers and portions, performing differential amplification that selectively enhances the magnetic field signal while suppressing noise, thus mediating between the physical magnetic field interaction and the usable output.
3Reliability
If multiple magnetic parts and elements are configured with specific orientations and overlapping conductive members, then the noise suppression capability improves, but the manufacturing complexity increases
Solution Approach 1:
The patent merges multiple functional elements into an integrated structure where magnetic parts, magnetic layers, and conductive members are combined in a unified bridge circuit configuration. The first and second magnetic parts, along with their respective magnetic layers and overlapping conductive members, are manufactured as an integrated assembly, reducing the number of discrete components and simplifying the manufacturing process while maintaining the noise suppression benefits.
4Measurement precision
If a bridge circuit configuration is used to suppress noise, then the sensitivity for detecting biological magnetic fields improves, but the device complexity increases
Solution Approach 1:
The bridge circuit is segmented into four distinct detection elements (first element with first magnetic layer, second element with second magnetic layer, third element with third magnetic layer, fourth element with fourth magnetic layer), each associated with specific magnetic parts. This segmentation allows for optimized detection of weak biological magnetic fields through differential measurement while keeping each individual element relatively simple in structure.
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
The design significantly increases the sensitivity of magnetic field detection, effectively suppressing noise and allowing for high-sensitivity detection of both external and biological magnetic fields, including those with low-frequency signals.
Implementation Method 1
arranged to concentrate external magnetic fields and apply alternating current magnetic fields
Implementation Method 2
magnetic sensor that uses a magnetic layer
Data Source
AI summary
According to one embodiment, a magnetic sensor includes a first magnetic part, a first magnetic member, a second magnetic part, a second magnetic member, a first element, a second element, a third element, a fourth element, and a first interconnect. The first magnetic part includes first, second, and third portions. The first portion is between the second and third portions. The second magnetic part includes fourth, fifth, and sixth portions. The fourth portion is between the fifth and sixth portions. The first element includes a first magnetic layer. The second element includes a second magnetic layer. The third element includes a third magnetic layer. The fourth element includes a fourth magnetic layer. The first interconnect includes first and second interconnect portions.