用于生物电阻抗检测的Howland电流源恒流特性研究  被引量:8

Research on Constant-current Characteristics of Howland Current Source Used in Bioelectrical Impedance Detection

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作  者:林兴建[1] 赵伟杰[1] 刘晓娟[1] 厉力华[1] 

机构地区:[1]杭州电子科技大学生命信息与仪器工程学院,杭州310018

出  处:《生物医学工程学杂志》2015年第2期290-294,共5页Journal of Biomedical Engineering

基  金:国家自然科学基金资助项目(61271063);浙江省教育厅科研计划资助项目(Y201223324);浙江省科技计划公益项目资助(2013C33164);杭州电子科技大学自动化学院科技创新项目

摘  要:本研究旨在基于生物电阻抗检测应用,分析、改进Howland电流源电路,研究高输出阻抗和高稳定度的交变电流恒流源。从电阻匹配值、运放参数选择两个方面仿真研究Howland电流源的恒流特性,并对输出阻抗进行了分析。仿真实验结果表明Howland电流源在最佳匹配电阻值时有更好的恒流特性;运放参数影响Howland电流源恒流特性;在Howland电流源电路中,经过参数优化的电流源有较高的输出阻抗和带负载能力。研究提示Howland电流源在匹配电阻的选择上存在最佳匹配电阻值;高带宽、高压摆率和开环增益、宽范围供电电压的运算放大器更加适合于生物电阻抗检测电路。This study aims to analyze and improve Howland current source circuit and to study the constant current source of alternating current with high output impedance and high stability.A simulation study was carried out on the constant-current characteristics of Howland current source from two aspects of resistance match value and the selection of Op amp parameters,and then the output impedance was analyzed.The simulation experiment showed that when it was with the best matched resistance,the constant-current characteristics of Howland current source was better.Op amp parameters could affect the constant-current characteristics of Howland current source.In Howland current source circuit,the current source after parameter optimization had better output impedance and load capacity.The results showed that there was the best matched resistance in the selection by Howland current source.The Op amp with large broadband,high slew rate and open loop gain,and wide range of power supply voltage is more suitable for the bioelectrical impedance detection circuit.

关 键 词:Howland电流源 阻值匹配 运放结构 恒流特性 

分 类 号:TN86[电子电信—信息与通信工程] R318[医药卫生—生物医学工程]

 

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