Bioelectric amplifier

Abstract

The invention discloses a bioelectric amplifier comprising an amplifier, an input end of the amplifier is provided with a bioelectric signal to be measured input by an electrode contact resistance, and is also provided with a high-frequency signal input by a resistance, the bioelectric signal to be measured together with the high-frequency signal enter into an analogue-to-digital converter to perform analog-to-digital conversion after passing through the amplifier and a low-pass filter in turn, then the electrode contact resistance is calculated by a processing unit and the bioelectric signalto be measured is obtained by sampling. The processing unit is a microprocessor or a microcontroller; the high-frequency signal is a differential high-frequency signal, the amplifier is a differential amplifier. The invention improves the accuracy of the signal, reduces the requirement for the amplifier gain, further improves the system performance and reduces system signal-noise ratio. The circuit is simple, the dynamic range is large, the input impedance is high, without debugging, the manufacturability is good, the performance and the function of the circuit are improved and the cost and the manufacturability requirement of the cost are reduced.

Description

technical field [0001] The invention relates to an electric amplifier. In particular, it relates to a biological electric amplifier with simple circuit, high performance and strong function. Background technique [0002] The detection of bioelectricity has important application value in medical research and clinical diagnosis, and many bioelectricity detection instruments have been widely used clinically, such as electrocardiogram machines, electroencephalograph machines and so on. However, because the bioelectric signal is weak and there are often many serious interference signals, many people are still conducting research on the detection method and circuit of the bioelectric signal. Liu Song and others proposed a monitor with ECG amplifier (Medical and Health Equipment. No. 2, 1995, 3-6), A.C.Metting Van Riji et al. (High-quality recording of bio-electric events.Med. & Bio. Eng. & Comput., 1990, 28: 389-397, D.W.McRobbie etc. (Rapid recoveryphysiological preamplifier wi...

AI Technical Summary

Problems solved by technology

[0003] The above-mentioned various forms of bioelectrical amplifiers not only have problems such as complex structure, poor manufacturability and unsatisfactory performance to varying degrees, but also have problems such as low sensitivity and inability to detect the contact impedance of electrodes.

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