21.2 A 1.4mΩ-sensitivity 94dB-dynamic-range electrical impedance tomography SoC and 48-channel Hub SoC for 3D lung ventilation monitoring system

Kim, Minseo; Kim, Hyunki; Jang, Jongsoo; Lee, Ji Hee; Lee, Jae-Hyuk; Lee, Jiwon; Lee, Kyungrog; Kim, Kwantae; Lee, Yongsu; Yoo, Hoi‐Jun

doi:10.1109/isscc.2017.7870407

Cited by 6 publications

(4 citation statements)

References 3 publications

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“…where '0)12 is the noise of the analog front-end and 12'12 is the measurement sensitivity in Ω/√ [22], [23]. The 12'12 value can reflect the front-end performance but does not reflect the overall EIT system performance.…”

Section: Current Eit System Evaluation Metricsmentioning

confidence: 99%

An Imaged Based Method for Universal Performance Evaluation of Electrical Impedance Tomography Systems

Jiang

Yerworth

et al. 2021

IEEE Trans. Biomed. Circuits Syst.

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This paper describes a simple and reproducible method for universal evaluation of the performance of electrical impedance tomography (EIT) systems using reconstructed images. To address the issues where common electrical parameters are not directly related to the quality of EIT images, based on objective full reference (FR) image quality assessment, the method provides a visually distinguishable hot colormap and two new FR metrics, the global and the more specific 'region of interest'. A passive 16 electrode EIT system using an application specific integrated circuit front-end was used to evaluate the proposed method. The measured results show, both visually and in terms of the proposed FR metrics, the impact on recorded EIT images with different design parameters and non-idealities. The paper also compares the image results of a passive electrode system with a matched 'single variable' active electrode system and demonstrates the merit of an active electrode system for noise interference. A figure of merit based on the FR metrics is proposed.

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Section: Current Eit System Evaluation Metricsmentioning

confidence: 99%

An Imaged Based Method for Universal Performance Evaluation of Electrical Impedance Tomography Systems

Jiang

Yerworth

et al. 2021

IEEE Trans. Biomed. Circuits Syst.

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“…Electrochemical impedance spectroscopy (EIS) is used in various sensor applications that require impedance measurement of a specific target [1][2][3][4][5][6][7]. Notable examples include gas concentration measurement [1], battery condition measurement, [2] human body composition analysis [3], impedance cardiography [4], and lung ventilation monitor [5]. It is also applied to systems that detect molecular substances ranging from intracellular action potential [6], DNA [7], and RNA [8] detection.…”

Section: Introductionmentioning

confidence: 99%

A 1.25 MHz, 108 dB Chopped Sampling-Mixer-Based Impedance Spectroscopy SoC in 0.18-μm CMOS

2022

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This paper presents an electrochemical impedance spectroscopy (EIS) system-on-chip in 0.18-μm CMOS, achieving a wide scan frequency range of 1.25 MHz. An on-chip direct digital frequency synthesizer generates a digital sine wave as well as in-phase and quadrature-phase clocks that are synchronized to the sinewave. A chopped sampling mixer realizes lock-in detection without requiring quadrature sinewaves while suppressing low-frequency noise and offset. The receive utilizes a 12-bit pipelined SAR ADC operating in 5 MS/s in combination with a digital averaging filter to maximize the dynamic range. The measured performance shows that the prototype EIS chip achieves the highest frequency scan range with a comparable dynamic range of 108 dB and power consumption of 14 mW when compared with the previous state-of-the-art prototypes.

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“…However, these traditional EIT systems were constructed with commercial off-the-shell (COTS) discrete components introducing noise through the wires during the signal transmission from electrodes to processing system. With the maturity of integrated circuit technology, system-on-chip (SoC) has contributed to portable EIT systems [5][6] which are smaller in size, low cost, low power and feasible for home use. The present EIT systems have much room for improvement for the sensing accuracy.…”

Section: Introductionmentioning

confidence: 99%

“…In addition, it is difficult to realize a high sensitivity system with a limited resolution ADC. Though the resolution of ADC is limited, M. Kim, et al, propose to average the measurements in different cycles to improve the sensitivity [6]. In this paper, a digital lock-in amplifier is proposed to increase the accuracy and sensitivity of the EIT system.…”

Section: Introductionmentioning

confidence: 99%

A High Accuracy and High Sensitivity System Architecture for Electrical Impedance Tomography System

Liu

et al. 2018

2018 IEEE Asia Pacific Conference on Circuits and Systems (APCCAS)

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A high accuracy and high sensitivity system architecture is proposed for the read-out circuit of electrical impedance tomography system-on-chip. The switched ratiometric technique is applied in the proposed architecture. The proposed system architecture minimizes the device noise by processing signals from both read-out electrodes and the stimulus. The quantized signals are post-processed in the digital processing unit for proper signal demodulation and impedance ratio calculation. Our proposed architecture improves the sensitivity of the read-out circuit, cancels out the gain fluctuations in the system, and overcomes the effects of motion artifacts on measurements.

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21.2 A 1.4mΩ-sensitivity 94dB-dynamic-range electrical impedance tomography SoC and 48-channel Hub SoC for 3D lung ventilation monitoring system

Cited by 6 publications

References 3 publications

An Imaged Based Method for Universal Performance Evaluation of Electrical Impedance Tomography Systems

An Imaged Based Method for Universal Performance Evaluation of Electrical Impedance Tomography Systems

A 1.25 MHz, 108 dB Chopped Sampling-Mixer-Based Impedance Spectroscopy SoC in 0.18-μm CMOS

A High Accuracy and High Sensitivity System Architecture for Electrical Impedance Tomography System

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