Electrode Sheet Integrating Amplifier for Noise Suppression
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Solution Overview
Problem
Conventional biological signal measuring devices suffer from noise interference due to wire leads acting as antennas, which complicates the measurement of brain wave signals with small amplitudes, necessitating costly high-bit A/D converters to mitigate noise effects.
Innovation Solution
An electrode sheet with integrated biological signal receiving electrodes, amplifiers, and a DC removing capacitor, where the first wire connecting the electrode and amplifier is shorter than the second wire, and the amplifier is designed to amplify AC signals up to 10 kHz, reducing noise influence and allowing for lower-cost A/D conversion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If wire leads are used to transmit biological signals, then signal transmission is achieved, but noise is received and applied to the signal
Solution Approach 1:
The patent extracts the amplifier function from the external processing unit and integrates it directly onto the electrode sheet. This places the signal amplification as close as possible to the electrode, before the signal travels through the wire lead, thereby removing the wire lead's role as a noise-carrying transmission medium for the amplified signal.
Solution Approach 2:
The patent performs signal amplification preliminarily at the electrode sheet before the signal is transmitted through the wire lead to the external processing unit. By amplifying the signal early, the signal-to-noise ratio is improved before the signal enters the wire lead, reducing the relative impact of noise.
2Measurement precision
If A/D converter bits are increased to measure noisy signals, then measurement precision is improved, but device cost increases
Solution Approach 1:
The patent performs analog signal amplification preliminarily at the electrode sheet before the signal reaches the A/D converter. By amplifying the signal early, the signal amplitude is increased before digitization, allowing the use of lower-bit A/D converters while maintaining adequate measurement precision, thereby reducing device cost.
3Object-affected harmful factors
If amplifier is integrated on electrode sheet, then noise influence is suppressed, but device complexity increases
Solution Approach 1:
The patent merges the amplifier function with the electrode sheet by integrating the amplifier circuit directly onto the same substrate. This consolidation combines multiple functions (electrode and amplifier) into a single integrated unit, which suppresses noise influence while managing device complexity through functional integration rather than adding separate components.
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 effectively suppresses noise interference, enabling accurate brain wave signal measurement with a less expensive A/D converter, reducing the impact of noise on the signal and improving the overall efficiency of the biological signal measuring device.
Implementation Method 1
a biological signal amplifier (13) formed at the electrode sheet (10)
Implementation Method 2
The first wire (15) connects the biological signal receiving electrode (12) and the input part (13A) of the biological signal amplifier (13) via a DC removing capacitor (151)
Data Source
AI summary
An electrode sheet is capable of suppressing an influence of noise that is applied on a wire, and a biological signal measuring device uses the electrode sheet. The electrode sheet is provided with a sheet, a biological signal receiving electrode formed at the sheet and exposed from the sheet, a biological signal amplifier formed at the sheet, an interface part for connection to an external biological signal processing unit, a first wire that connects the biological signal receiving electrode and an input part of the biological signal amplifier to each other, and a second wire that connects the interface part and an output part of the biological signal amplifier to each other.