Yuen-Hui Chee

Learn 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)
—This paper presents the principles for designing low-power transmitters for wireless sensor networks. Based on these principles, an injection-locked transmitter is implemented in a standard 0.13-m CMOS process and packaged using chip-on-board assembly. The transmitter utilizes a film bulk acoustic resonator (FBAR) to obtain a stable carrier at 1.9 GHz. At(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)
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)
  • 1