Abstract: An electrical stimulation system including: a mechanism generating at least one electrical signal to be applied to a biological tissue that is to stimulated and measuring a response of the biological tissue to each electrical signal; a calculation mechanism estimating, based on each electrical signal and on a corresponding response of the biological tissue, at least one parameter of an electrical model of the biological tissue and its interface with the electrical stimulation system and determining, using the model, at least one parameter of a stimulation pulse to be applied to the biological tissue by the electrical stimulation system; and a mechanism generating a stimulation pulse to be applied to the biological tissue.

Abstract: A converter circuit for connecting to a source of electrical energy that is capable of major fluctuations in delivered power. The circuit includes a chopper circuit having a variable duty cycle, a variable-size chopper switch and an input terminal connectable to said electric energy source; at least one first output circuit adapted to being connected via a variable-size chopper switch to an output terminal of the chopper circuit; and a control circuit configured to control firstly the duty cycle of the chopper circuit and secondly the size of said variable-size switches as a function of the power delivered by said electrical energy source.

Abstract: A method for testing a variable capacitance measurement system including a fixed voltage source, a variable capacitance sensor, and a circuit to process information output by this sensor. The method connects an electrically controllable electronic simulation device to replace the variable capacitance sensor, models the electrophysical behaviour of the sensor, and tests the system.

Abstract: A DC voltage conversion device including a DC/DC converter and an energy reservoir capable of providing a starting voltage to the DC/DC converter.

Abstract: A remote transmission device having a fixed station and a portable object provided with an antenna inductively coupled to the station, the object having a variable load impedance connected to terminals of the antenna, and a regulation loop regulating the voltage at terminals of the variable load impedance having rectifier means for rectifying the voltage at the terminals of the antenna and control means designed to modify the variable load impedance according to the output voltage of the rectifier means, and the station emitting an alternating magnetic field modulated in amplitude on 2N levels by data to be transmitted, encoded on N bits, the object having demodulation means having an n-bit analog to digital converter, clocked at an oversampling frequency much higher than the frequency of the data and connected between the rectifier means and the control means, and digital processing means connected to the output of the converter.

Abstract: A method for testing a variable capacitance measurement system including a fixed voltage source, a variable capacitance sensor, and a circuit to process information output by this sensor. The method connects an electrically controllable electronic simulation device to replace the variable capacitance sensor, models the electrophysical behaviour of the sensor, and tests the system.

Abstract: An accelerometric measurement device with a return loop including accelerometer, a corrector generating a signal for correction of the position of the accelerometer, a closed return loop to apply this correction signal to the accelerometer, a detector to detect an error in operation of the accelerometer, and a modifying component making at least a first modification to operation of the corrector from its initial state to a modified operating state.

Abstract: A DC voltage conversion device including a DC/DC converter and an energy reservoir capable of providing a starting voltage to the DC/DC converter.

Abstract: The portable object (1) is provided with an antenna (3) inductively coupled to a fixed station of a remote transmission device that emits an alternating magnetic field whose amplitude is modulated on 2<SP>N</SP> levels by data, which are to be transmitted and are encoded in N bits. The portable object has a variable load impedance (Z) connected to antenna terminals (3), and a control loop for controlling the voltage (Vac) to the terminals of the load impedance. The control loop comprises, in series-connected manner, a rectifier circuit (5) for rectifying the voltage (Vac) to the antenna terminals, an analog/digital converter (9) having n bits and being clocked at an oversampling frequency (Ck) much higher than the frequency of the data, and comprises a control circuit (10) serving to modify the load impedance (Z) according to the output voltage (Vdc) of the rectifier circuit (5).

Abstract: The invention relates to a capacitive measuring sensor including at least one measuring capacitor (Cm) and means (I1, I2, I3) for applying, in a measuring phase, an actuation voltage to at least one plate of the measuring capacitor.

Abstract: The invention relates to an accelerometric measurement device with return loop comprising: an accelerometer, a corrector, to generate a signal for correction of the position of the accelerometer, a closed return loop to apply this correction signal to the accelerometer, a detector to detect an error in operation of the accelerometer, and means making a first modification to operation of the correction means from its initial state to a modified operating state.

Abstract: A sigma-delta modulator comprising: at least one resonator (100a, 110b), a converter (120) to convert an analogue signal from the resonator into a digital signal with time information, and a feedback loop connecting an output of the converter to an excitation input of the resonator. According to the invention, at least one resonator in the modulator is chosen from among the group comprising mechanical, acoustic, electromechanical, electrostatic, optical and chemical resonators. Application to analogue-digital conversion, signal detection and signal generation.

Abstract: A sigma-delta modulator comprising: