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.

中文翻译：

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一种支持双模遥测的智能隐形眼镜控制器 IC，具有无线供电的反向散射 LSK 和使用单环天线的 EM 辐射 RF 传输

本文介绍了一种用于智能隐形眼镜 (SCL) 的控制器 IC。对于无线遥测，我们建议使用单个外部环形天线支持双模操作的发射器。在无线供电的反向散射负载转移键控 (LSK) 模式下，发射机配置为使用天线作为 ${L}$ 用于磁共振耦合。变送器将其配置切换为主动液晶显示器射频辐射传输模式中的振荡器电路。为了抑制平均功耗，采用 0.2% 的占空比和受控的时序安排，同时最大限度地减少睡眠模式下的静态功耗。为了减少瞬时放电的影响，通过以更高的速率传输数据来缩短数据传输的周期。设计的 IC 使用 0.18- $\mu \text{m}$ CMOS。为了体外在两种模式下的验证中，SCL 是通过集成 IC、葡萄糖传感器、薄膜电池、环形天线和电源调节电容器来实现的。该 IC 的功耗为 143 nW，输入动态范围为 89 dB。