Wideband mirrored current source design based on differential difference amplifier for electrical bioimpedance spectroscopy

Wideband mirrored current source design based on differential difference amplifier for electrical bioimpedance spectroscopy
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基于差分放大器的宽带镜像电流源生物阻抗谱设计

DOI:
10.1088/2057-1976/aaa9cd
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发表时间:
2018-02
影响因子:
1.4
通讯作者:
Jiangyan Sang
Jiangyan Sang
中科院分区:
--
文献类型:
--
作者:
Fu Zhang;Zhaosheng Teng;Haowen Zhong;Yuxiang Yang;Jianmin Li;Jiangyan Sang

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宽带电流源可以在大负载变化的宽频率范围内稳定工作,这对于电阻抗谱(EIS)测量的性能至关重要。本文采用两个简单的差分放大器AD830设计了一个宽带镜像电流源(MCS)。PSpice模拟和测量的负载电阻从100 Ω到1500 Ω,频率高达1 MHz。在整个带宽范围内,输出电流的最大变化小于0.5%,输出阻抗在100hz时为4.2 MΩ,在1mhz时大于185 kΩ。此外,通过分别以100 Hz、1 kHz和10 kHz的频率将输入电压信号VIN从0.1 V扫至2 V,实现了1 mA至20 mA输出电流IOUT的小于1%的线性误差(VIN与IOUT)。基于dda的宽带MCS具有精度高、线性度好、结构简单等优点,可以提高EIS测量和其他相关应用的性能。
Wideband current sources that can work stable over a wide frequency range with large load variations are critical for the performance of electrical impedance spectrum (EIS) measurements. In this paper, we design a wideband mirrored current source (MCS) using two simple differential difference amplifiers (DDA) AD830. PSpice simulation and measurement were performed on load resistances from 100 Ω to 1500 Ω over the frequencies up to 1 MHz. The maximum variation of the output current is less than 0.5% over the whole bandwidth and the output impedance is 4.2 MΩ at 100 Hz and greater than 185 kΩ at 1 MHz. Moreover, less than 1% linearity error (the VIN versus the IOUT) of the output current IOUT from 1 mA to 20 mA was achieved by sweeping the input voltage signal VIN from 0.1 V to 2 V at 100 Hz, 1 kHz and 10 kHz respectively. The DDA-based wideband MCS has high accuracy, linearity and simple structure, which may improve the performance of EIS measurements and other relevant applications.
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