Signal Acquisition Circuit With Driven-Right-Leg Feedback for ECG Interference
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Solution Overview
Problem
Electrocardiographic detection apparatuses face challenges in measuring electrocardiosignals due to electromagnetic interference from household power supplies, necessitating additional dry electrodes that increase user discomfort.
Innovation Solution
A signal acquisition circuit with feedback network branch circuits and a Driven-Right-Leg Circuit to eliminate common mode interference, reducing the need for dry electrodes by transmitting anti-interference signals through signal acquisition electrodes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a dry electrode is added to eliminate common mode interference, then the common-mode rejection capability is improved, but the number of electrodes increases and user comfort deteriorates
Solution Approach 1:
The signal acquisition electrode is designed to perform multiple functions: it both acquires the electrocardiosignal and serves as the dry electrode for common mode interference elimination. By integrating these functions into a single electrode, the patent eliminates the need for separate dry electrodes, thereby maintaining common-mode rejection capability while reducing the total number of electrodes to improve user comfort
Solution Approach 2:
The patent merges the signal acquisition function and the common mode interference elimination function into a single electrode structure. The signal acquisition electrode is electrically connected to both the signal processing module (for acquiring electrocardiosignals) and the Driven-Right-Leg Circuit (for eliminating common mode interference), thereby combining what were previously separate components into one unified element
2Measurement precision
If electromagnetic interference is eliminated through additional circuitry, then the measurement precision is improved, but the device complexity increases
Solution Approach 1:
The signal acquisition electrode serves dual purposes: acquiring the electrocardiosignal and acting as the dry electrode for common mode rejection. This multi-functionality eliminates the need for separate dry electrodes and reduces overall circuit complexity while maintaining measurement precision
Solution Approach 2:
The Driven-Right-Leg Circuit implements a feedback mechanism where the common mode interference signal is detected from the signal acquisition electrode, processed through the operational amplifier, and the corrected signal is fed back to eliminate the interference. This feedback approach effectively reduces common mode interference while using existing circuit components efficiently
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
Improves comfort by reducing the number of electrodes required, while enhancing the common-mode rejection capability and accuracy of physiological detection.
Implementation Method 1
the feedback network branch circuit is configured to transmit a common mode interference signal acquired by the corresponding signal acquisition electrode to the Driven-Right-Leg Circuit such that the Driven-Right-Leg Circuit performs a backward process on the common mode interference signal to generate an anti-interference signal
Data Source
AI summary
A signal acquisition circuit is provided in the present disclosure. The signal acquisition circuit includes a signal acquisition electrode, wherein the at least one signal acquisition electrode is provided with a signal acquisition branch circuit, and the signal acquisition electrode is provided with a feedback network branch circuit. A first terminal of the signal acquisition branch circuit is electrically connected to the signal acquisition electrode, a second terminal of the signal acquisition branch circuit is electrically connected to a signal input terminal of a signal processing module. A first terminal of the feedback network branch circuit is electrically connected to the signal acquisition electrode, a second terminal of the feedback network branch circuit is electrically connected to a Driven-Right-Leg Circuit.