Single-Op-Amp Biosignal Amplifier for Compact Signal Filtering
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Solution Overview
Problem
Existing biosignal measurement apparatuses are cumbersome and costly due to complex configurations requiring multiple operational amplifiers and high pass filters, making miniaturization and portability challenging.
Innovation Solution
A biosignal amplifying device with a simplified circuit configuration using a single operational amplifier and high pass filter with one stage, implemented on a printed circuit board or application-specific integrated circuit, incorporating capacitor and resistor loads for effective signal amplification and filtering.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple operational amplifiers and high pass filters are used for biosignal amplification and filtering, then signal amplification and filtering performance is improved, but device complexity and cost increase
Solution Approach 1:
The patent combines multiple operational amplifiers into a single operational amplifier by integrating the functions of buffer amplification, signal amplification, and high pass filtering into one unified circuit block. This merging reduces the number of discrete components while maintaining the necessary signal processing capabilities through careful circuit design where the single op-amp performs multiple functions that previously required separate components.
Solution Approach 2:
The single operational amplifier in the patent is designed to perform multiple functions simultaneously: it acts as a buffer amplifier for the first electrode signal, amplifies the second electrode signal, and implements high pass filtering for the biosignal. This multi-functionality allows one component to replace what previously required multiple specialized components, reducing overall device complexity.
2Reliability
If multiple operational amplifiers and high pass filters are used for biosignal amplification and filtering, then signal amplification and filtering performance is improved, but device size increases
Solution Approach 1:
The patent merges multiple discrete amplification and filtering stages into a single integrated circuit block using one operational amplifier. This consolidation physically reduces the space required for component mounting on the circuit board, enabling miniaturization of the overall biosignal measurement device while preserving the essential signal processing functions.
3Reliability
If multiple operational amplifiers and high pass filters are used for biosignal amplification and filtering, then signal amplification and filtering performance is improved, but manufacturing cost increases
Solution Approach 1:
The patent reduces manufacturing cost by consolidating multiple operational amplifiers and high pass filter circuits into a single operational amplifier implementation. This reduction in component count directly lowers bill of materials costs, assembly costs, and testing complexity, making the biosignal measurement device more economically viable for commercial production.
Data Source
AI summary
A biosignal amplifying device includes: an operational amplifier (op-amp); a capacitor load including a first capacitor connected with a first input terminal of the op-amp, and in which a first voltage is inputted from a first electrode, and a second capacitor which is connected with a second input terminal of the op-amp, and in which a second voltage is inputted from a second electrode; a feedback capacitor load including a first feedback capacitor connected with the first input terminal and an output terminal, and a second feedback capacitor connected with the second input terminal; and a feedback resistor load including a first feedback resistor connected with the first input terminal and the output terminal, and a second feedback resistor connected with the second input terminal.