Journal
IEEE TRANSACTIONS ON BIOMEDICAL CIRCUITS AND SYSTEMS
Volume 15, Issue 6, Pages 1268-1282Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TBCAS.2021.3126810
Keywords
Sensors; Wounds; Temperature sensors; Power capacitors; Wireless communication; CMOS process; System-on-chip; Electrochemical sensing; resolution scaling; time-based readout circuit
Funding
- MOST, Taiwan [109-2636-E-009-006, 110-2636-E-009-025]
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This paper presents a fully integrated wireless multimodal sensing chip that features voltammetric electrochemical sensing, temperature monitoring, and bi-phasic electrical stimulation for wound healing progress monitoring. The chip achieves a high linearity and low power consumption, with scalable resolution through dynamic threshold voltage adjustment to eliminate large passive components.
Multimodal sensing can provide a comprehensive and accurate diagnosis of biological information. This paper presents a fully integrated wireless multimodal sensing chip with voltammetric electrochemical sensing at a scanning rate range of 0.08-400 V/s, temperature monitoring, and bi-phasic electrical stimulation for wound healing progress monitoring. The time-based readout circuitry can achieve a 1-20X scalable resolution through dynamic threshold voltage adjustment. A low-noise analog waveform generator is designed using current reducer techniques to eliminate the large passive components. The chip is fabricated via a 0.18 mu m CMOS process. The design achieves R-2 linearity of 0.995 over a wide current detection range (2 pA-12 mu A) while consuming 49 mu W at 1.2 V supply. The temperature sensing circuit achieves a 43 mK resolution from 20 to 80 degrees. The current stimulator provides an output current ranging from 8 mu A to 1 mA in an impedance range of up to 3 k omega. A wakeup receiver with data correlators is used to control the operation modes. The sensing data are wirelessly transmitted to the external readers. The proposed sensing IC is verified for measuring critical biomarkers, including C-reactive protein, uric acid, and temperature.
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