用于生物阻抗测量的高输出阻抗CMOS电流驱动器

2010 Biomedical Circuits and Systems Conference (BioCAS) Pub Date : 1900-01-01 DOI:10.1109/BIOCAS.2010.5709613

H. Hong, A. Demosthenous, I. Triantis, P. Langlois, R. Bayford

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引用次数: 15

摘要

生物阻抗测量应用的进步需要在直流到兆赫频率范围内具有高输出阻抗的电流驱动器。特别是，它需要大于10 MΩ输出阻抗在低频率，例如，10khz。本文提出了一种基于操作跨导放大器(ota)的电流驱动器，使用反馈回路提供超过10 MΩ输出阻抗，范围从DC到10 kHz，在1 MHz时提供1 MΩ。此外，模拟了在宽频率范围(<4 MHz)下的稳定性能。电路采用±2.5 V电源，采用0.6 μm CMOS工艺设计。给出了仿真结果。

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A high output impedance CMOS current driver for bioimpedance measurements

Advances in bioimpedance measurement applications need current drivers with high output impedance in the frequencies ranging from DC to a number of MHz. In particular, it needs greater than 10 MΩ output impedance at low frequencies, e.g., 10 kHz. This paper presents an current driver based on operational transconductance amplifiers (OTAs) using a feedback loop to provide over 10 MΩ output impedance ranging from DC to 10 kHz and 1 MΩ at 1 MHz. In addition, a stable performance over a wide frequency range (<4 MHz) is simulated. The circuit has been designed in a 0.6-μm CMOS process using ±2.5 V power supplies. Simulated results are presented.

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2010 Biomedical Circuits and Systems Conference (BioCAS)

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