Signal acquisition processing circuit for digital brain electrical activity mapping instrument

Abstract

The invention relates to a signal acquisition processing circuit for a digital brain electrical activity mapping instrument. From signal acquisition input, the signal acquisition processing circuit comprises a follow low-pass filter circuit, a difference amplification circuit, a voltage amplification circuit, a 50Hz power frequency trap circuit, a secondary operation amplification circuit, a second-order active low-pass filter circuit and an A / D conversion circuit which are connected in sequence, wherein the A / D conversion circuit is connected with a computer with analyzing software through an optical isolation circuit. The signal acquisition processing circuit has the beneficial effects that the input impedance can reach over 10 megohms so as to improve the signal acquisition sensitivity; various filter circuits are adopted in signal processing, so that the common-mode interference is effectively inhibited, and the equipment working stability can be improved.

Description

technical field [0001] The invention relates to medical equipment, in particular to a signal acquisition and processing circuit of a digital electroencephalogram topography instrument. The circuit has built-in multi-stage amplification and multi-stage filtering, applies isolation technology, and effectively suppresses common-mode interference. Background technique [0002] Digital EEG topographer is a non-invasive medical instrument that continuously monitors patients' brain waves. It has become a routine equipment for the examination and monitoring of brain diseases in hospitals. It is also widely used in various mobile monitoring and sleep monitoring outside hospitals. It plays an important role in the diagnosis and treatment of epilepsy, tumor and traumatic brain injury. Since the human body is a high internal resistance signal source, the internal resistance can reach tens of thousands of ohms or even hundreds of thousands of ohms, and its internal impedance is easy to ch...

AI Technical Summary

Problems solved by technology

[0002] Digital EEG topographer is a non-invasive medical instrument that continuously monitors patients' brain waves. It has become a routine equipment for the examination and monitoring of brain diseases in hospitals. It is also widely used in various mobile monitoring and sleep monitoring outside hospitals. It plays an important role in the diagnosis and treatment of epilepsy, tumor and traumatic brain injury. Since the human body is a high internal resistance signal source, the internal resistance can reach tens of thousands of ohms or even hundreds of thousands of ohms, and its internal impedance is easy to change. Each branch may be unbalanced, so the current equipment is easily disturbed and the stability is not good

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