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A vibration-driven electret generator has been developed for energy harvesting applications. By using parylene as the spring material, a low-resonant-frequency MEMS generator is realized. Electrostatic levitation is adopted for the gap control. Large in-plane amplitude of 0.5 mm at the resonant frequency as low as 21 Hz has been achieved. We also demonstrate electret-powered operation of LED using...
This paper presents a 1.25 Gbps optical links design for mobile handsets. The system consists of an optical connector and a SER/DES main chip. The former contains an 850 nm VCSEL (vertical cavity surface emission laser), a GaAs-PIN photodiode and a transimpedance amplifier (TIA). The later includes a serializer, a deserializer, a VCSEL driver, a limiting amplifier, a PLL and a CDR. The chip and TIA...
Vibration-driven electret generator has been developed with the aid of MEMS technologies. Parylene high-aspect-ratio spring is successfully microfabricated to support an in-plane seismic mass. Resonant frequency as low as 37Hz has been achieved with a large in-plane amplitude of 1 mm. With our early prototype, we have obtained 21 Vp-p voltage output.
In this paper, we demonstrate that a two-dimensional arrangement of vertical cylindrical domains of asymmetric poly(styrene-b-methyl methacrylate) (PSt-b-PMMA) is achieved by graphoepitaxy using a resist pattern as the guide for alignment. The key to success is the combination of the neutralization of a bottom surface and the introduction of a two-dimensional hydrophilic guiding pattern, which leads...
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