期刊
IEEE JOURNAL OF SOLID-STATE CIRCUITS
卷 55, 期 4, 页码 856-867出版社
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/JSSC.2019.2959493
关键词
Biomedical diagnosis; miniaturized healthcare; smart contact lens (SCL); ultra-low-power telemetry; wireless sensor
资金
- World-Class 300 Program [S2482887]
- Korea Technology & Information Promotion Agency for SMEs (TIPA) [S2482887] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
This article presents a controller IC for smart contact lens (SCL). For wireless telemetry, we propose a transmitter supporting dual-mode operations with a single external loop antenna. In the wireless-powered backscattering load-shift keying (LSK) mode, the transmitter is configured to use the antenna as an ${L}$ for magnetic resonance coupling. The transmitter switches its configuration to be an active LC oscillator circuit in the RF-radiated transmission mode. To suppress the average power consumption, a 0.2% duty cycling is applied with a controlled timing schedule while minimizing static power consumption in the sleep mode. To reduce the effect of instantaneous discharging, the period of data transmission is shortened by transmitting data with a higher rate. The designed IC is fabricated using 0.18- $\mu \text{m}$ CMOS. For in vitro verifications in both modes, an SCL is implemented by integrating the IC, a glucose sensor, a thin-film battery, a loop antenna, and a supply-regulating capacitor. The IC achieves a power consumption of 143 nW with an input dynamic range of 89 dB.
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