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Title Low Power and Accurate Current Driver IC for Electrical Impedance Tomography Applications
Authors Jaeeun Jang(Jaeeun Jang) ; Hoi-Jun Yoo(Hoi-Jun Yoo)
DOI https://doi.org/10.5573/JSTS.2019.19.1.109
Page pp.109-115
ISSN 1598-1657
Keywords Transmitter ; digital ; differential ; termination ; inverter-based ; low voltage
Abstract In this paper, a current driver targeting for Electrical Impedance Tomography is proposed. The proposed IC is designed based on active electrode configuration. First, high output impedance current driver is implemented with phase compensation scheme through a delay-locked loop (DLL) to significantly alleviate a phase shift and a required power consumption in the driver. Second, low-power pseudo-sine wave generator is used not only for a lowharmonic distortion but also for a flexible injection frequency utilization. Third, the calibration unit is proposed to compensate injection-current amplitude variations among active electrodes. As a results, the proposed current driver IC guarantees more than 1 MΩ output impedance over a wide range of injection current up to 400 μA and operating frequency from 1 kHz to 5 MHz, only consuming 2.79 mW.