A Sinusoidal Current Driver With an Extended Frequency Range and Multifrequency Operation for Bioimpedance Applications.
A Sinusoidal Current Driver With an Extended Frequency Range and Multifrequency Operation for Bioimpedance Applications.
复制标题
具有扩展频率范围和多频率操作的正弦电流驱动器，适用于生物阻抗应用。
DOI：
10.1109/tbcas.2014.2332136
复制
发表时间：
2015
影响因子：
5.1
通讯作者：
Langlois PJ
中科院分区：
文献类型：
--
作者：
Langlois PJ
本文介绍了一种适用于需要高频操作的生物阻抗应用的替代正弦电流驱动器。该电路基于跨导器，并针对其极点频率附近的频率提供具有低相位误差的电流输出。这扩展了当前驱动器的工作频率上限。在每个单独的频率都经过相位校正的情况下，可以生成多频电流。对电路的分析以及仿真和实验结果一起呈现，证明了单频和双频电流驱动器的概念验证。对电路的分立测试版本的测量表明，在 3 MHz、2 mAp-p 输出电流下，相位从 25° 减少到 4°。由于引入了相位补偿，电流驱动器的输出阻抗在 100 kHz 至 5 MHz 的频率范围内基本恒定在 1.1 M Ω 左右。对于 4° 的残余相位延迟，补偿可将带宽增加约六倍。
This paper describes an alternative sinusoidal current driver suitable for bioimpedance applications where high frequency operation is required. The circuit is based on a transconductor and provides current outputs with low phase error for frequencies around its pole frequency. This extends the upper frequency operational limit of the current driver. Multifrequency currents can be generated where each individual frequency is phase corrected. Analysis of the circuit is presented together with simulation and experimental results which demonstrate the proof of concept for both single and dual frequency current drivers. Measurements on a discrete test version of the circuit demonstrate a phase reduction from 25° to 4° at 3 MHz for 2 mAp-p output current. The output impedance of the current driver is essentially constant at about 1.1 M Ω over a frequency range of 100 kHz to 5 MHz due to the introduction of the phase compensation. The compensation provides a bandwidth increase of a factor of about six for a residual phase delay of 4°.