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In this paper, we present new results on the development of an original acoustic waveguides concept based on a Periodically Poled Lithium Niobate transducer. Periodically poled transducers have been investigated recently as an alternative to classical inter-digital transducers for the excitation and detection of guided acoustic waves. We expose here two different structures of RF resonators based...
In this paper, we propose new structures based on “Silicon/PPLN thin film” hybrid wafers for nonlinear-optical and Radio-Frequency applications. This stack is obtained by home-made room-temperature bonding and wafer thinning techniques. Two main wafer bonding techniques have been developed on 3 and 4-inch wafers. The Au/Au bonding for RF applications and the Au/Au/SiO2 bonding for optical applications...
Electrical safety should be a top priority for all industrial, utility, and commercial installations. There should not be any delay in performing an electrical hazard analysis to identify the hazards that are present or likely to be present in the workplace; develop an effective electrical safety program and safe work procedures; provide the required shock and arc flash clothing and personal protective...
A ground-fault circuit-interrupter (GFCI) is an electrical device, either a receptacle or circuit breaker, which is designed to protect people from electric shock. GFCI protection should not be confused with ground-fault protection for equipment or grounding in general. Even if a system is properly grounded, minor faults in a circuit can cause a dangerous shock to a person using an appliance or power...
This paper introduces a novel atomic force microscope (AFM) and parallel robot integrated micro-force measurement system whose objective is the measurement of adhesion force between planar micro-objects. This paper is mainly focused on the kinematics parameters estimation between the objects to be measured, the parallel robot and the AFM system in order to position both objects during measurement...
Micro and nano-particles can be trapped by a non uniform electric field through the effect of dielectrophoretic principle. Dielectrophoresis (DEP) is used to separate, manipulate and detect micro particles in several domains, such as in biological or Carbon Nano-Tubes (CNTs) manipulations. Current methods to simulate the trajectory of micro-particles under a DEP force field are based on Finite Elements...
In this paper we propose and evaluate our platform to accelerate applications using custom instruction set extensions. We use a dynamically reconfigurable functional unit (DRFU) to execute the application specific custom instructions generated by our compiler framework. We explore two architectures with different computational granularities for the DRFU (look-up table and ALU based) and evaluate this...
Memory accesses are a major cause of energy consumption for embedded systems and the stack is a frequent target for data accesses. This paper presents a fully software technique which aims at reducing the energy consumption related to the stack by allocating and transferring frames or part of frames between a scratch-pad memory and the main memory. The technique utilizes an integer linear formulation...
In this paper, we present new results on the development of piezoelectric transducers based on periodically poled ferroelectric domains on lithium niobate bonded on silicon. The fabrication of the periodically poled transducers operating in the range 50-500 MHz has been achieved on a 3" 500 mum thick wafer. These devices have then been bonded on a silicon wafer and thinned to a few ten microns...
In this work, we report on the design and test of a cMUT structure based on a thin silicon membrane shaped in order to comply our modeling assumptions, i.e. long 2D-like cMUT cells able to operate conformably to the simulated operation of an actual 2D structure. The device is designed to operate at a minimum of 6 MHz in air and to exhibit an operation bandwidth larger than 100% in water. The silicon...
In this paper, we present new results on the development of piezoelectric transducers based on periodically poled ferroelectrics domains. The fabrication of test devices operating in the range 50 - 500 MHz has been achieved. Pure longitudinal modes are excited, yielding high frequency operation of test devices with easily achievable lithography process (20 and 10 ??m periods). The dispersion analysis...
The development of piezoelectric transducers based on periodically poled ferroelectrics domains is investigated. Optical quality Z-cut LiNbO3 wafers have been used for the fabrication of test devices operating in the range 7-70 MHz. The fabrication process is detailed and characterization results are reported. A very good agreement between theoretical predictions achieved by periodic finite element...
Bulk acoustic waves excited in thin piezoelectric films have revealed their capabilities for addressing the problem of high frequency RF filters (above 1 GHz). In this paper, we propose an alternative to thin film deposition consisting in single crystal wafers bonded on a substrate (for instance silicon or glass) and thinned, allowing for plate thickness close to 10 mum. This has been achieved on...
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