Ultra-low power sensor platform with wireless charging system

In this paper, we propose a power autonomous sensor platform with ultra-low power radio frequency (RF) transceiver and wireless charging. The ultra-low power RF transceiver consists of super-regenerative receiver and direct-modulation transmitter with multi-cell power amplifier. Although the proposed transmitter and receiver only consume 1.79 and 0.683 mW, respectively, the wearable sensor platform requires more power efficient transmitter, due to the limited capacity of rechargeable thin film battery, e.g, 50 ~ 250 mWhr [1]. Therefore, we apply wireless charging in order to prolong the lifetime and investigate the impact of wireless power transfer on the power autonomy of sensor platform.