A 120μW MICS/ISM-band FSK receiver with a 44μW low-power mode based on injection-locking and 9x frequency multiplication
ABSTRACT For true low-power peer-to-peer wireless links for sensing, link symmetry must be maintained unlike in [1,2] where the burden is shifted to the receiver. In addition, the transceiver power dissipation and performance should be adaptive to save power when the link distance is short. We present a 120μW MICS/ISM band receiver with -90dBm sensitivity at a data-rate of 200kb/s with BER<;0.1%. The receiver incorporates a 44μW low-power (LP) mode that achieves -70dBm sensitivity at 200kb/s and 0.1% BER. At a lower data-rate of 20kb/s, the LP mode can be used as a wake-up receiver with increased sensitivity of -75dBm with 1 % BER and 38μW power consumption.
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- "Low-IF 925 FSK -87 44/1300 N/A 65  IL 80 FSK -62 45 312 180  IL 45 FSK -62.7 37.5 200 130  IL 405 FSK -75 38 20 130  SRO 1900 OOK -100.5 400 5 N/A  SRO 2400 FSK -86 215 250 180 "
ABSTRACT: This paper discusses the perspectives of using a wake-up receiver (WUR) in wireless body area network (WBAN) applications with event-driven data transfers. First we compare energy efficiency between the WUR-based and the duty-cycled medium access control protocol -based IEEE 802.15.6 compliant WBAN. Then, we review the architectures of state-of-the-art WURs and discuss their suitability for WBANs. The presented results clearly show that the radio frequency envelope detection based architecture features the lowest power consumption at a cost of sensitivity. The other architectures are capable of providing better sensitivity, but consume more power. Finally, we propose the design modification that enables using a WUR to receive the control commands beside the wake-up signals. The presented results reveal that use of this feature does not require complex modifications of the current architectures, but enables to improve energy efficiency and latency for small data blocks transfers.IEICE Transactions on Communications 04/2015; E98-B(4):535-542. DOI:10.1587/transcom.E98.B.535 · 0.23 Impact Factor
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ABSTRACT: A 400MHz on-off keying transceiver for medical implant applications is presented. The transceiver achieves ultra-low power and high sensitivity with an analog "quadratic sum" demodulation scheme, which enables the using of a low intermediate frequency and a free-running oscillator for power saving. A new current-reuse structure and an inductor-sharing technique for front-end are also introduced to further reduce power consumption. The transceiver is implemented in 0.18μm CMOS process with 3.18mm 2 chip area. At 2 Mbps data rate, the receiver achieves energy efficiency of 1.71nJ/bit with sensitivity of -80.2dBm for 10 -3 BER, and the transmitter achieves energy efficiency of 1.53nJ/bit with -2.17dBm output power.Proceedings of the 37th European Solid-State Circuits Conference, ESSCIRC 2011, Helsinki, Finland, Sept. 12-16, 2011; 01/2011
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ABSTRACT: Emerging technology holds tremendous promise for improving recovery following brain injury. Here we describe a home-based rehabilitation system for improving volitional control of hand movement. People with cerebral palsy and those recovering from stroke or traumatic brain injury often have difficulty producing coordinated movements of the hand and arm on one side of the body. Surface electromyography (sEMG) recorded over affected muscles is used to provide enhanced visual feedback via a computer game interface. Several weeks of practice using this system has resulted in improved muscle coordination. Preliminary results are shown from the next generation of this system, which will employ ultra-low power wireless sensors to transmit muscle activity to a home computer.IEEE Global Humanitarian Technology Conference, GHTC 2011, Seattle, WA, USA, October 30 - November 1, 2011; 01/2011