Abstract: A piezoelectric system includes a piezoelectric resonator comprising a piezoelectric element and a pair of electrodes configured to transmit signals emitted by the piezoelectric element and generated by a deformation of the piezoelectric element; a detector configured to detect at least two signals of the signals generated by the deformation of the piezoelectric element, the at least two signals being detected at different instants; a control unit configured to compare the at least two signals and, on the basis of the comparison, determine a complex active impedance value as a function of a predetermined law; an active impedance unit configured to generate an active impedance based on the complex active impedance value determined by the control unit, the active impedance being connected to the pair of electrodes.

Abstract: A quantum device includes multiple spin qubits, multiple electrometers, each being capacitively coupled to one of the spin qubits, multiple injection-locked oscillators, each being coupled to one of the electrometers and designed to transmit an excitation signal to the electrometer to which it is coupled, each excitation signal having a different frequency, an amplification circuit comprising at least one amplifier, wherein the device comprises a feedback loop coupling the output of the amplification circuit to an input of each injection-locked oscillator and through which an injection signal flows, each injection-locked oscillator being designed to receive the injection signal and, as a function of the injection signal, maintain or decrease its excitation signal.

Abstract: An electronic control device for controlling a converter that comprises a piezoelectric element and a plurality of switches which are commanded to alternate phases, respectively at substantially constant voltage, and substantially constant charge, across the terminals of said piezoelectric element, the control device comprising: a measurement module for measuring a period of a resonance cycle of the piezoelectric element; an event detection module for detecting a characteristic event belonging to a current resonance cycle; a command module for commanding the switching of the switches; a computation module for computing at least three subsequent switching time instants during at least one subsequent resonance cycle, which is posterior to the current resonance cycle, each subsequent switching time instant being computed based on a respective characteristic event; and the command module being configured to command the switching of the respective switch at each of the subsequent time instants computed.

Abstract: A quantum device including: several spin qubits arranged as a matrix and each comprising a quantum dot; several electrometers each electrostatically coupled to a potential well of one of the quantum dots; circuits for applying an excitation signal to an input electrode of each electrometer, configured such that a value of the frequency, phase or maximum amplitude of each excitation signal is different from that of the other excitation signals, and applying a same excitation signal on electrometers coupled to a same row od qubits; a transimpedance amplifier having an input coupled to output electrodes of the electrometers; a demultiplexing circuit including an input electrically coupled to an output of the transimpedance amplifier, and configured to demultiplex the output signals to be delivered by the electrometers.

Abstract: The present disclosure relates to a method of tuning an electric charge extraction circuit of a vibrational energy harvester having a mechanical resonator, the method comprising varying, during a first phase, first and second parameters (?1,?2) of the electric charge extraction circuit based on detected harvested power (PHARVEST), each of the first and second parameters (?1,?2) influencing the amount of damping of the mechanical resonator and at least the first parameter (?1) influencing the resonance frequency of the mechanical resonator, wherein the first and second parameters (?1,?2) are varied during the first phase such that the amount of damping remains constant or varies by less than a first significant amount and the resonance frequency reaches a final level.

Abstract: A device for recovering or dampening vibratory energy from a mechanical resonator, comprising: an electrical generator comprising an element for converting mechanical vibration energy into electrical charges coupled to the resonator, the electrical generator periodically transferring a portion of the electrical charges from one terminal of the conversion element to the other; a frequency variation to phase variation conversion device, comprising an injection-locked oscillator of which the free-running oscillation frequency is equal to the resonance frequency of the resonator, and supplying to the electrical generator a control signal of frequency equal to that of the signal outputted by the conversion element and of which the phase shift depends on the difference between the frequency of the signal outputted by the conversion element and the resonance frequency of the resonator.

Abstract: The invention concerns a circuit for recuperating electrical energy from a mechanical resonator (402) comprising: a voltage inversion circuit (408) configured to invert the voltage across a capacitance (Cp) of the mechanical resonator, the voltage inversion circuit comprising: a capacitor (Cint); and a charge transfer circuit configured: to discharge a voltage of a first polarity held by the capacitance of the mechanical resonator to said capacitor during a first period; and to charge a voltage, of opposite polarity to the first polarity, to the capacitance of the mechanical resonator during a second period using the voltage potential stored by said capacitor during the first period; wherein the charge transfer circuit comprises an inductance and at least one switch controllable to limit the current passing through the inductance.

Abstract: A piezoelectric generator including: a piezoelectric element; a circuit for shorting and placing in open circuit the piezoelectric element; and an inductive converter.

Abstract: The present disclosure relates to a method of tuning an electric charge extraction circuit of a vibrational energy harvester having a mechanical resonator, the method comprising varying, during a first phase, first and second parameters (?1,?2) of the electric charge extraction circuit based on detected harvested power (PHARVEST), each of the first and second parameters (?1,?2) influencing the amount of damping of the mechanical resonator and at least the first parameter (?1) influencing the resonance frequency of the mechanical resonator, wherein the first and second parameters (?1,?2) are varied during the first phase such that the amount of damping remains constant or varies by less than a first significant amount and the resonance frequency reaches a final level.

Abstract: The invention concerns a circuit for recuperating electrical energy from a mechanical resonator (402) comprising: a voltage inversion circuit (408) configured to invert the voltage across a capacitance (Cp) of the mechanical resonator, the voltage inversion circuit comprising: a capacitor (Cint); and a charge transfer circuit configured: to discharge a voltage of a first polarity held by the capacitance of the mechanical resonator to said capacitor during a first period; and to charge a voltage, of opposite polarity to the first polarity, to the capacitance of the mechanical resonator during a second period using the voltage potential stored by said capacitor during the first period; wherein the charge transfer circuit comprises an inductance and at least one switch controllable to limit the current passing through the inductance.

Abstract: An autonomous electronic system includes two input terminals that are connected to an external electrical energy source, a converter circuit comprising at least one inductive element and connected to the terminals in order to receive energy from the source, a means for storing the energy delivered by the converter circuit, an electronic processing circuit performing a predefined function and delivering a data signal after performing the function, an emission circuit connected to an antenna in order to transmit the data signal to a remote receiver, and a control circuit able to control the circuits supplied with power by virtue of the energy source, the system being wherein the converter circuit and the antenna comprise at least one common inductive element and in that it comprises a link device situated between the emission circuit and the at least one common inductive element so as to transmit the signal emitted by the antenna formed at least partly by the at least one common inductive element.

Abstract: A piezoelectric generator including: a piezoelectric element; a circuit for shorting and placing in open circuit the piezoelectric element; and an inductive converter.