A 13.56-MHz -25-dBm-Sensitivity Inductive Power Receiver System-on-a-Chip With a Self-Adaptive Successive Approximation Resonance Compensation Front-End for Ultra-Low-Power Medical Implants.
A 13.56-MHz -25-dBm-Sensitivity Inductive Power Receiver System-on-a-Chip With a Self-Adaptive Successive Approximation Resonance Compensation Front-End for Ultra-Low-Power Medical Implants.
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用于超低功耗医疗植入物的具有自适应逐次逼近谐振补偿前端的13.56 MHz -25 dBm灵敏度感应功率接收器片上系统。
DOI：
10.1109/tbcas.2020.3047827
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发表时间：
2021-03
影响因子：
5.1
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无电池和超低功耗的植入式医疗设备（IMD）具有最小的侵入性是最新的治疗范例。本文介绍了一种13.56 MHz感应功率接收器片上系统，在驱动30 μW轻负载时，输入灵敏度为−25.4 dBm（2.88 μW），效率为46.4%。特别是，提出了一种实时谐振补偿方案，以减轻共振变化常见的IMD由于不同的介电环境，负载条件和制造失配等的功率接收前端采用了6位电容器组，定期调整根据逐次逼近谐振调谐（SART）算法。补偿范围高达24 pF，在12个时钟周期内收敛，功耗开销可忽略不计。采集的1.7 V至3.3 V电压在片内数字化，并通过超宽带脉冲无线电（IR-UWB）反向遥测进行传输，以实现闭环调节。该集成电路采用180 nm CMOS工艺制造，总电流耗散为750 nA。在2cm的间隔距离下，端到端功率传输效率达到16.1%，同时驱动30 μW负载，这不受人为诱导的谐振电容偏移的影响。所提出的系统可以应用于各种无电池的IMD，具有数量级的功率传输效率的潜在改进。
Battery-less and ultra-low-power implantable medical devices (IMDs) with minimal invasiveness are the latest therapeutic paradigm. This work presents a 13.56-MHz inductive power receiver system-on-a-chip with an input sensitivity of −25.4 dBm (2.88 μW) and an efficiency of 46.4% while driving a light load of 30 μW. In particular, a real-time resonance compensation scheme is proposed to mitigate resonance variations commonly seen in IMDs due to different dielectric environments, loading conditions, and fabrication mismatches, etc. The power-receiving front-end incorporates a 6-bit capacitor bank that is periodically adjusted according to a successive-approximation-resonance-tuning (SART) algorithm. The compensation range is as much as 24 pF and it converges within 12 clock cycles and causes negligible power consumption overhead. The harvested voltage from 1.7 V to 3.3 V is digitized on-chip and transmitted via an ultra-wideband impulse radio (IR-UWB) back-telemetry for closed-loop regulation. The IC is fabricated in 180-nm CMOS process with an overall current dissipation of 750 nA. At a separation distance of 2 cm, the end-to-end power transfer efficiency reaches 16.1% while driving the 30-μW load, which is immune to artificially induced resonance capacitor offsets. The proposed system can be applied to various battery-less IMDs with the potential improvement of the power transfer efficiency on orders of magnitude.