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首页> 外文期刊>Biomedical Circuits and Systems, IEEE Transactions on >A Sinusoidal Current Driver With an Extended Frequency Range and Multifrequency Operation for Bioimpedance Applications
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A Sinusoidal Current Driver With an Extended Frequency Range and Multifrequency Operation for Bioimpedance Applications

机译：具有扩展频率范围和多频操作的正弦电流驱动器，用于生物阻抗应用

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摘要

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 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.
机译：本文介绍了另一种正弦电流驱动器，该驱动器适用于需要高频工作的生物阻抗应用。该电路基于跨导器，可为极点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频率操作上限。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。给出了电路分析以及仿真和实验结果，这些结果证明了单频和双频电流驱动器的概念验证。在该电路的分立测试版本上进行的测量表明，对于2 mAp-p输出电流，在3 MHz时相位从25降低至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约1.1M。对于4的残留相位延迟，补偿可将带宽增加大约六倍。

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