A Smart Contact Lens Controller IC Supporting Dual-Mode Telemetry With Wireless-Powered Backscattering LSK and EM-Radiated RF Transmission Using a Single-Loop Antenna
| Autor: | Minseob Lee, Sangbaie Shin, Su-Kyoung Kim, Cheonhoo Jeon, Kyongsu Lee, Jahyun Koo, Sei Kwang Hahn, Jae-Yoon Sim |
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| Rok vydání: | 2020 |
| Předmět: |
Physics
Electronic oscillator business.industry Loop antenna 020208 electrical & electronic engineering Transmitter Electrical engineering Hardware_PERFORMANCEANDRELIABILITY 02 engineering and technology Contact lens CMOS Transmission (telecommunications) Hardware_GENERAL Hardware_INTEGRATEDCIRCUITS 0202 electrical engineering electronic engineering information engineering Electrical and Electronic Engineering Antenna (radio) business Sleep mode |
| Zdroj: | IEEE Journal of Solid-State Circuits. 55:856-867 |
| ISSN: | 1558-173X 0018-9200 |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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