Bioimpedance measurement using mixed-signal embedded system

Cabrera-López, J. J.; Velasco-Medina, Jaime; Denis, Ernesto Rodríguez; Calderon, Juan Felipe Briceno; Guevara, Oscar Julian Gomez

doi:10.1109/lascas.2016.7451078

Cited by 4 publications

(2 citation statements)

References 18 publications

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“…A configuration using microprocessors has also been reported [20,21]. In [20], the configuration used a microprocessor (STM32F405RG, STMicroelectronics N.V.).…”

Section: Introductionmentioning

confidence: 99%

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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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“…A configuration using microprocessors has also been reported [20,21]. In [20], the configuration used a microprocessor (STM32F405RG, STMicroelectronics N.V.).…”

Section: Introductionmentioning

confidence: 99%

“…The frequency was 1 mHz to 100 kHz using an analog-to-digital converter (ADC) and a digital-to-analog converter (DAC) in the STM32F405RG. The device in [21] could conduct measurement using an excitation voltage of 1 MHz with PSoC5 (Infineon Technologies AG, Cheonan-si, Korea).…”

Section: Introductionmentioning

confidence: 99%