Analog front end AFE circuit for EEG signal acquisition

Abstract

The invention discloses an analog front end (AFE) circuit for EEG signal acquisition. The analog front end (AFE) circuit comprises an instrument amplifier, a signal buffer, a differential low-pass filter and an analog-to-digital converter; the instrument amplifier is a differential output instrument amplifier; the signal buffer is connected with the instrument amplifier; the differential low-pass filter is connected with the signal buffer; and the analog-to-digital converter is connected with the differential low-pass filter. Therefore, the analog front end AFE circuit realizes and provides a brand new fully differential link architecture, and improves the signal-to-noise ratio and the anti-interference capability.

Description

technical field [0001] The invention relates to the field of circuit technology, in particular to an analog front-end AFE circuit for EEG signal acquisition. Background technique [0002] The EEG signal represents the electroencephalogram, which is the overall reflection of the electrophysiological activity of brain nerve cells on the surface of the cerebral cortex or scalp. EEG signals contain a large amount of physiological and disease information, and are widely used in brain activity analysis and disease diagnosis. However, due to the low amplitude, randomness and strong nonlinearity of EEG signals, it is easily affected by other signals during the acquisition process, which increases the difficulty of subsequent analysis. [0003] Since the EEG signal is collected by electrodes placed on the scalp through the synchronous discharge of neurons in the cerebral cortex through multiple layers of tissue such as the cortex, cerebrospinal fluid, dura mater, skull, and scalp, i...

AI Technical Summary

Problems solved by technology

However, the existing instrumentation amplifiers are all single-ended output, which cannot meet the needs of full differential

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