Biopotential recorder

Abstract

The invention discloses a biopotential recorder. The biopotential recorder comprises a chopper amplification module and a low-pass filtering module; the chopper amplification module comprises an offset elimination unit, a common mode elimination unit, a feedback unit, a direct current servo unit, an output amplification unit, an impedance lifting unit, a first modulation unit and a second modulation unit; the offset elimination unit is connected with the common mode elimination unit, the feedback unit, the direct current servo unit, the first modulation unit and the second modulation unit; theoutput amplification unit is connected with the feedback unit, the DC servo unit, the second modulation unit, the impedance lifting unit and the low-pass filtering module; and the first modulation unit is connected with the impedance lifting unit. Input noise is reduced through a first modulation unit of the chopper amplification module, electrode direct current offset is removed through the direct current servo unit, finally filtering is conducted through the low-pass filtering module, and the noise reduction capacity is high; the common mode elimination unit is used for reducing common-modeinterference; and while an input signal is amplified, the interference of the noise is reduced, and the performance is high.

Description

technical field [0001] The present application relates to the field of circuit technology, in particular to a biological potential recorder. Background technique [0002] High-efficiency biopotential recorders play a vital role in brain-machine interface (Brain-Machine-Interface, BMI) systems. The amplitude of Targeted Signals, such as Action Potential (AP), Local Field Potential (LFP), Electrocardiograph (ECG), Electromyography (EMG) and EEG ( The amplitude of Electroencephalo-graph (EEG) is usually between tens of volts and several millivolts, and the frequency band distribution is usually between tens of microvolts (μV) and several millivolts (mV). Power consumption performance is critical in the design of a biopotential recorder. Most existing low-power designs improve power performance by reducing current, at the expense of noise performance. In order to optimize the power efficiency factor (Power Efficiency Factor, PEF), the existing method proposes to reduce the po...

AI Technical Summary

Problems solved by technology

Most existing low power designs improve power performance by reducing current at the expense of noise performance

In order to optimize the power efficiency factor (Power Efficiency Factor, PEF), the existing method proposes to reduce the power supply voltage to sub-V, but it will lead to higher total harmonic distortion (Total Harmonic Distortion, THD)

In addition, these circuits are susceptible to common-mode interference (Common-mode Interference, CMI), especially power-line interference (Power-line InterferencePLI)

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