Adaptive Electrode Feedback Gain for Low-Noise Biosignal Sensing
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Solution Overview
Problem
Conventional biometric signal measurement using electrodes is affected by environmental factors and noise, with existing methods unable to effectively remove noise components, especially when the gain of the feedback amplifier exceeds a certain threshold.
Innovation Solution
An electronic device with a first, second, and third electrode, an instrumentation amplifier, and a control circuit that analyzes noise in the biometric signal to adjust the noise feedback gain and/or the contact area of the electrodes, allowing for effective noise reduction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the gain of the feedback amplifier is increased to reduce noise component, then the noise component is decreased, but the noise component may not be decreased any longer if the gain is greater than or equal to a predetermined gain
Solution Approach 1:
The feedback amplifier gain is made dynamically adjustable rather than fixed. The control circuit monitors the biometric signal quality and automatically adjusts the feedback amplifier gain in real-time to optimize noise cancellation while preventing saturation or instability that occurs at excessive gain levels.
Solution Approach 2:
A closed-loop feedback mechanism is implemented where the control circuit continuously monitors the biometric signal and noise levels, then adjusts the feedback amplifier gain accordingly. This adaptive feedback system ensures optimal noise reduction without exceeding the predetermined gain threshold where performance degrades.
2Ease of operation
If post-processing is performed with initially set gain or electrode size, then the measurement process is simple, but the method is highly dependent upon signal from electrode and incapable of removing noise component
Solution Approach 1:
The measurement system performs self-adjustment through automatic gain control. The control circuit autonomously monitors signal quality and adjusts the feedback amplifier gain without requiring manual intervention, maintaining operational simplicity while enabling adaptive noise reduction.
Solution Approach 2:
The system dynamically changes the gain parameter of the feedback amplifier based on real-time signal conditions. This automatic parameter adjustment allows the system to maintain simplicity of operation while adapting to varying signal quality and noise levels to effectively remove noise components.
3Measurement precision
If dynamic adjustment of noise feedback gain and electrode contact area is performed, then the signal-to-noise ratio is enhanced, but the device complexity increases
Solution Approach 1:
The control circuit is designed to perform multiple functions: monitoring biometric signal quality, analyzing noise levels, adjusting feedback amplifier gain, and controlling electrode contact area. This multi-functional approach consolidates complexity into a single integrated control unit rather than requiring separate systems for each function.
Solution Approach 2:
The system replaces manual mechanical adjustment of electrode contacts with electronic control. The control circuit electronically adjusts the effective contact area through feedback control, substituting mechanical manipulation with automated electronic regulation to reduce operational complexity while maintaining measurement precision.
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 approach enhances the signal-to-noise ratio of biometric signals by dynamically adjusting noise feedback gain and electrode contact area, resulting in improved signal quality.
Implementation Method 1
an instrumentation amplifier which differentially amplifies signals received from the first electrode and the second electrode
Implementation Method 2
a feedback amplifier which feeds back a feedback noise to a body part of the user via the third electrode
Data Source
AI summary
Disclosed in various embodiments of the present invention are a method and a device comprising: a first electrode, a second electrode and a third electrode which make contact with the body of a user; an instrumentation amplifier for differentially amplifying signals received from the first electrode and the second electrode; a feedback amplifier for feeding back feedback noise to the body of the user through the third electrode; and a control circuit, wherein the control circuit is configured to analyze a noise level by using a biosignal obtained from the instrumentation amplifier, and control the gain of the feedback amplifier on the basis of the result of the analysis. Various embodiments are possible.