摘要
设计了一种具有皮肤接触阻抗同步检测功能的生物电测量电路,采用同相并联方式输入,结合仪表放大器以及共模驱动电路以获取高共模抑制比.利用微电流交流恒流源,在测量生物电信号的同时可检测皮肤接触阻抗.电路还具有50 Hz陷波、低通、高通滤波等功能.为了测试电路性能指标,设计了基于Labview的放大器性能自动测试平台,可对放大器幅频特性、共模抑制比进行实时动态测试.实际测量结果表明:生物电信号放大器性能优异,可获得120 dB的共模抑制比,能够用于心电、脑电、肌电等生理电信号测量.
A bioelectronical measurement circuit wit this paper. A homophase parallel connection circuit is and a common-mode driver for high CMRR. The eirc time of bioeleetricity measuring by a microeurrent AC h skin-contact impedance detection is designed in used for the input, and an instrumental amplifier uit can detect skin-contact impedance at the same constant current source. A 50 Hz bandstop filter, lowpass and highpass filters are included in this circuit. In order to test its performances, an automatic test platform based on NI＇s Labview is developed. It can automatically measure amplitudefrequency response and CMRR of the amplifier. According to the practical test, the CMRR is close to 120 dB. Therefore, it＇s absolutely suitable for bioelectricity measuring occasions such as ECG, EEG, EMG and SO on.
出处
《测试技术学报》
2010年第2期111-116,共6页
Journal of Test and Measurement Technology
基金
国家基础科学人才培养基金资助项目(J0730317)
山西省自然科学基金资助项目(2007011041)
山西省高校科技开发项目(20081001)
