A Multimodality Electrochemical and Impedance Spectroscopy System-on-A-Chip With Temperature Sensing and Impedance-Boosting Techniques
Journal
IEEE Transactions on Biomedical Circuits and Systems
Journal Volume
PP
Date Issued
2023-01-01
Author(s)
Lin, Yi Jie
Liu, Wei Cheng
Huang, Yu Chiao
Huang, Ying Jie
Yeh, Yung Hua
Chang, Min Hua
Lin, Shu Ping
Liao, Yu Te
Abstract
This paper presents a multimodal electrochemical sensing system-on-chip (SoC), including the functions of cyclic voltammetry (CV), electrochemical impedance spectroscopy (EIS), and temperature sensing. CV readout circuitry achieves an adaptive readout current range of 145.5 dB through an automatic range adjustment and resolution scaling technique. EIS has an impedance resolution of $9.2 m\Omega \sqrt Hz$at a sweep frequency of 10 kHz and an output current of up to 120 µA. With an impedance boost mechanism, the maximum detectable load impedance is extended to 22.95 kΩ, while the total harmonic distortion is less than 1%. A resistor-based temperature sensor using a swing-boosted relaxation oscillator can achieve a resolution of 31 mK in 0-85 ℃. The design is implemented in a 0.18 µm CMOS process. The total power consumption is 1 mW.
Subjects
Biomedical measurement | CMOS | Current measurement | Electrical Impedance Spectroscopy | Electrochemical | Frequency measurement | Impedance | Impedance Boosting | Multimodality | Sensors | Temperature sensors | Voltage control | Wide range
SDGs
Type
journal article