A 35xc2xb5W Receiver FrontEnd with 35% wireless energy harvesting efficiency for Wearable Medical Applications Lowpower and high energy efficiency receiver is one of the most important blocks of wearable medical devices. It has received much attention in both academia and industry in recent years. The high energy efficiency and low power make it difficult to realize the RF receiver in wearable medical applications (WMA). This paper presents a Lowpower RF receiver frontend with wireless energy harvesting technique (LPREH) for WMA. The RX wakeup timing control method is proposed to optimize the RX energy efficiency. Moreover, the energy harvesting technique is adopted to selfpower the RX. The proposed LPREH supports 900M2.45G band which is compatible with existing UHFISM protocols, and can demodulate OOK signals with 33 % PCE at 500mV antenna input signal. The RX consumes 36xc2xb5W80kbps and presents 0.45nJbit RX energy efficiency.

Analysis of a SingleFrequency MultiChannel Ambient RF Energy Harvesting in CMOS Technology This paper proposes a single frequency multichannel RF energy harvesting (RFEH) system capable of increasing the power harvesting density and sensitivity performance. Alternatively, the power summation of the multichannel RFEH system is investigated to determine the electrical characteristics in the output power density and output voltage with respect to varying input power level conditions. The RFEH system was simulated on a standard 65 nm CMOS technology and the simulation results show that by combining the power from each RF harvesting branch of the same frequency, the output power density is increased by 1.74x. In addition, better performance in the sensitivity down to 20.4 dBm for a Vout of 1V of the multichannel RF harvesting is observed when compared to single channel harvesting.