This paper describes a new multiphase modeling for oil bubble actuation in microchannel with cerebrospinal fluid (CSF). The sampling method is based on an oil droplet microvalve to measure the conductivity and impedance of the CSF in a non-moving liquid. The proposed system was simulated using the finite element software Comsol Multiphysics. For the fluidic modeling and simulation, the multiphase flow level set package of Comsol was used to describe the interaction between oil and CSF. Regarding the electric force computation, the Maxwell stress tensor was explicitly computed in Comsol and then coupled to the fluid dynamics. The values of permittivity of oil ( oil ) and CSF ( CSF ) were used, respectively, 2.2 and 109. Simulation results show the actuation of an oil droplet inside a constriction valve, demonstrating the operation of the sampling system.
This paper presents an ultra-low power, fully integrated solar energy harvester circuit for autonomous microsystems. The proposed circuit harvests solar energy from a micro-power photovoltaic module and stores the harvested energy in a miniaturized thin film Li-Ion microbattery, using a highly area-and power-efficient power management circuit. As neither inductor, nor large pumping capacitors have been used in this circuit, it occupies less area comparing to conventional inductive and switched-capacitor DC-DC converters. In addition, thanks to low power design of this circuit, it achieves more than 94% efficiency during battery charging. Even under reduced light intensity, when the harvested energy is only a few tens of microwatts, more than 92% efficiency is achievable. The proposed microsystem has been implemented in a 0.18µm CMOS process and occupies a core area of only 0.12mm 2 . This circuit features a low power consumption of 270nW in average.
We present progress on high-speed electronic ICs for Silicon Photonic transceivers. The design freedom offered by Silicon Photonics is exploited to generate multilevel modulation formats, reduce power consumption and physical footprint or increase speed. We show drivers and receivers integrated in CMOS and SiGe BiCMOS processes.
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