An Impedance Readout IC with Ratio-Based Measurement Techniques for Electrical Impedance Spectroscopy

Cheon, Song-I; Kweon, Soon-Jae; Kim, Young–In; Koo, Jimin; Ha, Sohmyung; Je, Minkyu

doi:10.3390/s22041563

Cited by 11 publications

(10 citation statements)

References 40 publications

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“…For the measurement aspect, Cheon et al presented an effective impedance measurement feature for bioimpedance consideration, where it measures the magnitude and the real part of the complex impedance [ 68 ]. Figure 25 shows the presented electrochemical impedance spectroscopy system, which measures the impedance over the targeted frequency band.…”

Section: Biomedical Applications From the Measurement Perspectivementioning

confidence: 99%

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Amplifiers in Biomedical Engineering: A Review from Application Perspectives

Kouhalvandi

Matekovits

Peter

2023

Sensors

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Continuous monitoring and treatment of various diseases with biomedical technologies and wearable electronics has become significantly important. The healthcare area is an important, evolving field that, among other things, requires electronic and micro-electromechanical technologies. Designed circuits and smart devices can lead to reduced hospitalization time and hospitals equipped with high-quality equipment. Some of these devices can also be implanted inside the body. Recently, various implanted electronic devices for monitoring and diagnosing diseases have been presented. These instruments require communication links through wireless technologies. In the transmitters of these devices, power amplifiers are the most important components and their performance plays important roles. This paper is devoted to collecting and providing a comprehensive review on the various designed implanted amplifiers for advanced biomedical applications. The reported amplifiers vary with respect to the class/type of amplifier, implemented CMOS technology, frequency band, output power, and the overall efficiency of the designs. The purpose of the authors is to provide a general view of the available solutions, and any researcher can obtain suitable circuit designs that can be selected for their problem by reading this survey.

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Section: Biomedical Applications From the Measurement Perspectivementioning

confidence: 99%

“… General structure of electrochemical impedance spectroscopy presented in [ 68 ] with a combination of voltage-controlled current source (VCCS), integrated circuit (IC), and instrumentation amplifier (IA). …”

Section: Figurementioning

confidence: 99%

Amplifiers in Biomedical Engineering: A Review from Application Perspectives

Kouhalvandi

Matekovits

Peter

2023

Sensors

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“…The ASIC configuration has been applied in detecting DNA hybridization [23] and measuring bioimpedance, which could be achieved with low power consumption [24]. Furthermore, ASIC configurations have been reported for EIT when impedance with multiple channels is required, such as prostate cancer screening [25], lung imaging [26,27], and many other purposes [28][29][30][31].…”

Section: Introductionmentioning

confidence: 99%

FPGA-Based Processor for Continual Capacitive-Coupling Impedance Spectroscopy and Circuit Parameter Estimation

Tsukahara

Yamaguchi

Tanaka

et al. 2022

Sensors

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In principle, the recently proposed capacitive-coupling impedance spectroscopy (CIS) has the capability to acquire frequency spectra of complex electrical impedance sequentially on a millisecond timescale. Even when the measured object with time-varying unknown resistance Rx is capacitively coupled with the measurement electrodes with time-varying unknown capacitance Cx, CIS can be measured. As a proof of concept, this study aimed to develop a prototype that implemented the novel algorithm of CIS and circuit parameter estimation to verify whether the frequency spectra and circuit parameters could be obtained in milliseconds and whether time-varying impedance could be measured. This study proposes a dedicated processor that was implemented as field-programmable gate arrays to perform CIS, estimate Rx and Cx, and their digital-to-analog conversions at a certain time, and to repeat them continually. The proposed processor executed the entire sequence in the order of milliseconds. Combined with a front-end nonsinusoidal oscillator and interfacing circuits, the processor estimated the fixed Rx and fixed Cx with reasonable accuracy. Additionally, the combined system with the processor succeeded in detecting a quick optical response in the resistance of the cadmium sulfide (CdS) photocell connected in series with a capacitor, and in reading out their resistance and capacitance independently as voltages in real-time.

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“…1. These approaches prioritize the accuracy and low-power consumption, potentially sacrificing the throughput and dynamic range, which are less important for the specific applications [16].…”

mentioning

confidence: 99%

Impedance-Readout Integrated Circuits for Electrical Impedance Spectroscopy: Methodological Review

Cheon,

Choi,

Kang

et al. 2024

IEEE Trans. Biomed. Circuits Syst.

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This review paper provides a comprehensive overview of impedance-readout integrated circuits (ICs) for electrical impedance spectroscopy (EIS) applications. The readout IC, a crucial component of on-chip EIS systems, significantly affects key performance metrics of the entire system, such as frequency range, power consumption, accuracy, detection range, and throughput. With the growing demand for portable, wearable, and implantable EIS systems in the Internet-of-Things (IoT) era, achieving high energy efficiency while maintaining a wide frequency range, high accuracy, wide dynamic range, and high throughput has become a focus of research. Furthermore, to enhance the miniaturization and convenience of EIS systems, many emerging systems utilize two-electrode or dry electrode configurations instead of the conventional four-electrode configuration with wet electrodes for impedance measurement. In response to these trends, various technologies have been developed to ensure reliable operations even at two-or dryelectrode interfaces. This paper reviews the principles, advantages, and disadvantages of techniques employed in state-ofthe-art impedance-readout ICs, aiming to achieve high energy efficiency, wide frequency range, high accuracy, wide dynamic range, low noise, high throughput, and/or high input impedance. The thorough review of these advancements will provide valuable insights into the future development of impedance-readout ICs and systems for IoT and biomedical applications.

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An Impedance Readout IC with Ratio-Based Measurement Techniques for Electrical Impedance Spectroscopy

Cited by 11 publications

References 40 publications

Amplifiers in Biomedical Engineering: A Review from Application Perspectives

Amplifiers in Biomedical Engineering: A Review from Application Perspectives

FPGA-Based Processor for Continual Capacitive-Coupling Impedance Spectroscopy and Circuit Parameter Estimation

Impedance-Readout Integrated Circuits for Electrical Impedance Spectroscopy: Methodological Review

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