Yuen-Hui Chee

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This paper presents an ultra-low power, low voltage injection locked transmitter for wireless sensor networks. The transmitter utilizes Film Bulk Acoustic Resonator (FBAR) to obtain a stable 1.9 GHz carrier and achieves 32% efficiency while delivering 0 dBm from a 280 mV supply. With 50% on-off keying, it consumes 1.6 mW and supports a maximum data rate of(More)
In a dense ad-hoc wireless sensor network, the transmit power is comparable to the circuit power. Linear power amplifiers, which require lower drive power as compared to its switching counterparts, now become a viable candidate. This paper presents a class A/B low power amplifier suitable for ad-hoc wireless sensor network. The amplifier is implemented in(More)
The design and implementation of a 1.9GHz radio frequency transmit beacon is presented. The beacon is completely self-contained, and all necessary energy is scavenged through solar and vibrational energy sources. Custom RF integrated circuitry and energy scavenging devices are used to create a highly integrated and efficient beacon. The 1.9GHz direct(More)
The PicoCube is a 1 cm<sup>3</sup> sensor node using harvested energy as its source of power. Operating at an average of only 6uW for a tirepressure application, the PicoCube represents a modular and integrated approach to the design of nodes for wireless sensor networks. It combines advanced ultra-low power circuit techniques with system-level power(More)
Summary form only given. The availability of wireless transceivers transmitting over ranges from few microns to less than half a meter opens the door for a wide range of exciting new applications, ranging from seamless system assembly, smart surfaces, healthcare monitoring and intelligent machinery and components. However, the implementation challenges in(More)
The PicoCube is a 1cm 3 sensor node using harvested energy as its source of power. Operating at an average of only 6uW for a tire-pressure application, the PicoCube represents a modular and integrated approach to the design of nodes for wireless sensor networks. It combines advanced ultra-low power circuit techniques with system-level power management. A(More)
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