Human Body Communication Reception Device Differential Amplifier Noise Rejection
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Solution Overview
Problem
Existing communication methods using the human body as a signal medium face challenges in maintaining stability and amplification of signals, particularly due to interference and the need for miniaturization and portability, which affect the reliability and performance of reception devices.
Innovation Solution
A reception device comprising a base member with a first and second electrode, a differential amplifier, and a circuit board that includes a power plane and ground plane, where the first electrode contacts the human body to receive digital signals, and the second electrode receives a reference voltage, with the differential amplifier amplifying the potential difference to generate a stable amplification signal, and a data processing unit corrects this signal for restoration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a reception device uses a human body as a signal medium for wireless communication, then portability and elimination of wired connections are improved, but signal stability and amplification reliability deteriorate due to interference and noise
Solution Approach 1:
The patent introduces a differential amplifier as an intermediary device that processes the weak reception signal from the human body medium. The differential amplifier amplifies the potential difference between the reception signal and reference voltage while rejecting common-mode noise, thereby maintaining signal stability without compromising the portability benefits of human-body-based communication
Solution Approach 2:
The patent employs a reference voltage electrode that is spaced from the human body to create a stable reference potential. This reference electrode, combined with the differential amplifier, establishes an equipotential reference that cancels out common-mode interference from the human body medium, ensuring reliable signal reception while maintaining device portability
2Volume of moving object
If the distance between the circuit board and the first electrode is reduced for miniaturization, then device size is improved, but power noise interference increases
Solution Approach 1:
The differential amplifier serves as an intermediary buffer between the first electrode and the circuit board. Even when the distance is reduced for miniaturization, the differential amplifier's high common-mode rejection ratio prevents power noise from the circuit board from coupling into the sensitive reception signal path, allowing compact design without sacrificing noise immunity
Solution Approach 2:
The patent extracts the noise rejection function into a dedicated differential amplifier stage, separating the signal amplification function from the noise filtering function. This allows the circuit board to be positioned close to the electrode for miniaturization while the differential amplifier actively removes power noise interference through its differential processing capability
3Reliability
If the second electrode is spaced from the human body to reduce interference, then signal quality is improved, but the device complexity increases
Solution Approach 1:
The second electrode, spaced from the human body, serves multiple functions: it provides a reference voltage for the differential amplifier, acts as a shield against external interference, and establishes a stable common-mode reference potential. This multi-functional design improves signal quality without proportionally increasing device complexity
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 enhances signal amplification and stability, improving the reception performance by minimizing the impact of power noise and maintaining signal integrity while ensuring the device's miniaturization and portability, thus addressing the limitations of previous human-body-based communication systems.
Implementation Method 1
The differential amplifier may amplify a potential difference between the reception signal and the reference voltage to generate an amplification signal
Data Source
AI summary
The reception device includes a base member, a first electrode, a second electrode, a differential amplifier, and a circuit board. The base member includes a first surface and a second surface. The first electrode is provided on the first surface and configured to receive a reception signal. The second electrode is provided on the second surface and configured to receive a reference voltage. The differential amplifier is configured to amplify a potential difference between the reception signal and the reference voltage. The circuit board is configured to provide a power voltage and a reference ground to the differential amplifier. A distance between the circuit board and the first electrode is smaller than a distance between the circuit board and the second electrode. According to an embodiment of the inventive concept, the amplification performance of the reception device using a human body as a medium is improved.