Electro-physiological signal detecting active electrode

Abstract

The invention relates to an electro-physiological signal detecting active electrode. The electro-physiological signal detecting active electrode is characterized by comprising a voltage follower basiccircuit, a virtual ground feedback circuit and an independent direct-current power source, wherein the independent direct-current power source supplies power for the voltage follower basic circuit and the virtual ground feedback circuit; the voltage follower basic circuit is a voltage follower based on an operational amplifier, receives the input level of a measuring point on a human body and output level to a back-end circuit; the virtual ground feedback circuit is mainly composed of a voltage follower based on an operational amplifier, and a current limiting resistor, and virtual ground isfed back to the surface of the human body sequentially via the voltage follower and the current limiting resistor. The electro-physiological signal detecting active electrode avoids adding the numberof connecting wires of the back-end circuit, is compatible with existing passive electrode-oriented electro-physiological detecting equipment, and meanwhile, is high in detecting precision and less prone to introducing interference and noise.

Description

technical field [0001] The present application relates to an active electrode for physiological electrical signal detection. [0002] Physiological electrical signals refer to electrical signals such as ECG, EEG, and EMG that carry physiological information. Active electrodes (Active Electrodes, AE), that is, electrodes with built-in detection circuits, are increasingly used in physiological signal detection, especially in wearable applications. The reason is that the active electrode is converted by its built-in circuit near the measuring point, and its low output impedance can improve the accuracy of the detection circuit and the robustness to environmental interference, such as suppressing 50Hz or 60Hz AC interference, weakening the cable Cable motion artifacts, etc. Background technique [0003] Active electrodes, as the name implies, require power for their built-in detection circuitry. The power supply of the active electrodes can be in charge of the back-end detect...

AI Technical Summary

Problems solved by technology

Its disadvantage is: the number of wires between the active electrode and the back-end circuit is multiplied, which increases the cable cost and the user's discomfort and inconvenience

[0006] The above active electrode schemes for physiological electrical signal detection will not only increase the number of connecting wires to the back-end circuit, but also such active electrodes cannot be compatible with existing passive electrode-oriented physiological electrical signal detection systems

Images