Abstract:
The resonant device comprises an electromechanical resonator of nanometric or micrometric size that comprises a mobile element and a fixed element. Detection means provide detection signals representative of movement of the mobile element with respect to the fixed element to a feedback loop that is connected to an excitation input of the resonator. The resonator is formed on the same substrate as the detection means and feedback loop. The feedback loop comprises at most first and second transistors connected in series between a reference voltage and the excitation terminal. A capacitive load is connected between the excitation terminal and reference voltage. The detection signals control the conductivity of the first transistor.
Abstract:
The device resonant comprises a plurality of synchronized oscillators. Each oscillator comprises a resonator which comprises detection means providing detection signals representative of oscillation of the resonator to a feedback loop connected to an excitation input of the resonator. The detection signals control the conductivity of the feedback loop of the oscillator. The excitation inputs of all the resonators are connected to a common point which constitutes the output of the resonant device. A capacitive load is connected between said common point and a reference voltage.
Abstract:
This array (10) of coupled resonators (16i) comprises means (12) for supplying an input electrical signal (Ve) and means (14) for electrically exciting N coupled resonators (16i) of the array using this input electrical signal.The electrical excitation means (14) comprise, for each of these N coupled resonators (16i), actuation means (18,) connected to the means (12) for supplying the input electrical signal for an actuation of this coupled resonator according to the input electrical signal, and variable gain input amplification means (20i) for the actuation of this coupled resonator specific to this coupled resonator (16i). Furthermore, they comprise means (22) for controlling a specific setting of the variable gain of each of the input amplification means (20i).
Abstract:
A device with a suspended beam and piezoresistive means of detecting displacement of the beam and a method of manufacturing the device are disclosed. The device comprises a support, a suspended beam, moving parallel to the plane of the support, and means of detecting displacement, comprising at least two piezoresistive strain gauges that are not in line with each other. The beam is suspended through detection means. The two gauges are located on two opposite lateral faces of the beam respectively.
Abstract:
An oscillator including two groups of elementary junctions having giant magnetoresistance effect traversed by electric currents, the junctions of each of the two groups being in series and energized by respective main currents and the voltages across the terminals of the groups being added together to provide a voltage on an output of the oscillating circuit. The voltage across the terminals of one or more junctions of a first group is applied to a first input of a phase comparator and the voltage across the terminals of one or more junctions of the other group is applied to another input of the phase comparator, the phase comparator providing on two outputs secondary currents of the same amplitude and of opposite signs, which are dependent on the mean phase difference between the voltages applied to the inputs, the secondary currents each being added to a respective main current.
Abstract:
A device for generating a clock signal, including a phase-locked loop including: a controlled oscillator to deliver a clock signal; plural phase comparators to compare a phase of the clock signal delivered by the controlled oscillator with plural clock signal phases applied at an input of the phase-locked loop; a mechanism for weighted summation of output signals of the plural phase comparators such that one or more of the weighting coefficients applied to one of the output signals has an absolute value that overrides the absolute values of the other weighting coefficients applied to the other output signals; and a mechanism filtering the weighted sum of the output signals of the plural phase comparators, to deliver at an output a control signal to the controlled oscillator.
Abstract:
The device resonant comprises a plurality of synchronized oscillators. Each oscillator comprises a resonator which comprises detection means providing detection signals representative of oscillation of the resonator to a feedback loop connected to an excitation input of the resonator. The detection signals control the conductivity of the feedback loop of the oscillator. The excitation inputs of all the resonators are connected to a common point which constitutes the output of the resonant device. A capacitive load is connected between said common point and a reference voltage.
Abstract:
A method of identifying an electronic or electromechanical system includes: applying at least one noise signal (u) as input to the system, applying an output signal of the system to a one-bit analog digital converter, acquiring a signal at the output of the converter, carrying out an estimation of the output of the system with aid of performing an estimation (ĥ) of the impulse response of the system. The estimation (ĥ) of the impulse response includes: iterative calculation of a plurality of nh elements (J0, . . . , Ji, . . . , Jnh−1) of a given criterion (J), each element including, respectively: at least one term of correlation between the signal at the output of the converter and the noise signal.
Abstract:
The oscillator comprises at least a first series of a multiple of four sub-assemblies each of which comprises an excitation terminal and an output terminal. The sub-assemblies are arranged in series in a closed loop. The output terminal of each sub-assembly is connected to the excitation terminal of the following sub-assembly. The output terminal of one of the sub-assemblies constitutes the output terminal of the oscillator. Each sub-assembly comprises excitation means and a nanowire which constitutes the electromechanical resonator and the piezoresistive detection means of movement of the resonator. A first terminal of the nanowire is connected to a first supply voltage. The second terminal of the nanowire constitutes the output terminal of the sub-assembly which is grounded via a corresponding resistive circuit. An input terminal of the excitation means constitutes the excitation terminal of the sub-assembly.
Abstract:
Analyzer 1 for analyzing a fluid 3 containing at least one substance to be analyzed and at least one inflammable substance containing: a source of gas 9 to provide a flux of diluent gas, an injecting nozzle 11 for introducing samples of the fluid into the flux of diluent gas and for producing a gaseous flux, and a detector 7 for analyzing the gaseous flux, wherein: the source of gas is intended to deliver a flux of diluent gas containing a material capable of supporting the combustion of the inflammable substance, preferably to deliver a flux of air, the injection nozzle is configured so as to introduce into the diluent gas samples of the fluid such that the average volume fraction of the fluid in the gaseous flux is less than 1/2,000 and preferably less than 1/20,000, and the detector contains at least one microsensor for detecting the substance to be analyzed. Corresponding method.