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Fuketa, H., O'uchi, S., & Matsukawa, T. (2016). A 0.3-V 1-μW Super-Regenerative Ultrasound Wake-Up Receiver with Power Scalability. IEEE Transactions on Circuits and Systems II: Express Briefs. This brief presents an ultra-low power wake-up receiver using ultrasound for IoT applications. To achieve both high sensitivity and low power consumption, we propose a Colpitts-oscillator-based super-regenerative receiver (COSR). Owing to the simple architecture of the proposed COSR, a lowest supply voltage operation of 0.3 V and a smallest area are achieved. Furthermore, the power consumption of the proposed wake-up receiver is scalable and is determined by the input signal sensitivity and data rate, which are configurable by the user. In a field test, the proposed wake-up receiver consumes 1 W, which is smaller by 77% than that of a conventional ultrasound wake-up receiver at a comparable communication distance and data rate. A planar acoustic receiver for near field acoustic communication using evanescent wave. They develop a receiver that sends a wakeup signal to some devices when it gets an ultrasonic wakeup signal from another device (e.g. a smartphone). Sound is used to restrict the range, at which the signal can be detected (for privacy reasons). http://iopscience.iop.org/article/10.7567/JJAP.53.07KB07