Magnetic Sensor Series Integration for Noise Reduction
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Solution Overview
Problem
Silicon integrated Hall effect sensors have insufficient measurement resolution and frequency bandwidth, limiting their ability to accurately measure broadband magnetic fields due to high inherent noise and low gain-bandwidth product, making them impractical for modern applications.
Innovation Solution
A magnetic field sensor system comprising a combination of Hall effect sensors and inductive components connected in series with an amplifier, where the output signals are added to enhance signal-to-noise ratio and frequency bandwidth, and optionally using spinning current or chopper stabilization techniques to improve noise reduction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If silicon integrated Hall effect sensors are used, then device complexity is reduced and ease of manufacture is improved, but measurement precision and frequency bandwidth deteriorate due to high inherent noise and low gain-bandwidth product
Solution Approach 1:
The patent combines multiple Hall effect sensors (first magnetic field sensor and one or more second magnetic field sensors) into a single integrated system, where their output signals are summed together. This merging approach increases the overall signal amplitude while maintaining compatibility with standard integrated circuit manufacturing processes, thereby improving measurement precision without sacrificing ease of manufacture
2Measurement precision
If amplifier area and power consumption are increased to improve noise performance and gain-bandwidth product, then measurement precision and frequency bandwidth are improved, but device cost and practicality deteriorate
Solution Approach 1:
Instead of increasing amplifier size and power consumption, the patent merges multiple Hall effect sensor outputs to collectively provide the necessary signal amplitude. This approach achieves improved measurement precision and noise performance without requiring larger or more power-consuming amplifiers, maintaining practicality for integrated circuit implementation
3Measurement precision
If multiple magnetic field sensors are combined in series, then measurement precision and frequency bandwidth are improved, but device complexity increases
Solution Approach 1:
The patent combines multiple Hall effect sensors in a series configuration where their output signals are summed together. This merging strategy improves measurement precision and frequency bandwidth by increasing the overall signal amplitude and reducing the impact of individual sensor noise, while the systematic integration approach keeps device complexity manageable through standardized circuit design
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 solution achieves improved measurement resolution and frequency bandwidth, reducing noise and increasing the magnetic field measurement range, with a noise equivalent magnetic field spectral density comparable to commercial silicon integrated Hall effect sensors and a frequency bandwidth extended to several MHz.
Implementation Method 1
silicon integrated Hall effect sensors
Implementation Method 2
inductive coil, such as a Rogowski coil
Data Source
AI summary
A magnetic field sensor system comprising a first magnetic field sensor, one or more second magnetic field sensors and an amplifier and all magnetic field sensors are connected in series so that the respective output signals can be added up to a common input signal of the amplifier.