Devialet

Stmicroelectronics (grenoble 2) Sas

Easii Ic Sas

Easii Ic

Alexandre Huffenus

Pierre-Emmanuel Calmel

Vincent Rabary

Robert Cittadini

Gaël Pillonnet

Serge Pontarollo

Charles Coqueret

Mathieu Pernot

Frédéric Goutti

Gael Pillonnet

David Aimé Pierre Gras

The present invention relates to an amplification device () of an input signal comprising: The amplification device () further comprises a compensation circuit (), for each amplification stage (), able to generate a compensation signal (I, I) of the stray component of the smoothed signal (I, I) generated in the inductive element () of the corresponding amplification stage ().

Amplifying device comprising a compensation circuit

A switching power supply is provided which includes an input for an input current at an input voltage, a controlled transistor bridge having two branches each with two transistors, the two branches being connected in parallel to the input terminals, a transformer having a primary connected between the midpoints of the two branches formed between the transistors of each branch, an output for an output current connected to the terminals of a secondary circuit of the transformer, and a control unit for the transistors to alternately switch each of the midpoints between high and low values with a time offset between the switching times of the midpoint values. The control unit is also capable of ensuring that the time order for switching of the midpoints between the high and low values thereof varies over the course of time.

Switching power supply with controlled transistor bridge

The input stage () of a high-fidelity amplifier () with high linearity and a low distortion rate comprises: &#x2014;an input () for the digital signal to be converted;&#x2014;a voltage output () for the converted voltage;&#x2014;a digital/analog converter (), the input of which forms the input () for the digital signal to be converted, the digital/analog converter () having access to a signal terminal ();&#x2014;a voltage current conversion resistor () arranged between the voltage output () and a reference potential; and&#x2014;a current/voltage converter () that has a voltage output and is arranged between the signal terminal () and the voltage outlet (). The current/voltage converter () comprises a transistor (). The source of the transistor () is only connected to the signal terminal () of the digital/analog converter ().

Input stage of an amplifier and corresponding amplifier

The present invention concerns a synchronization method for synchronizing at least two systems for rendering multimedia streams, the method comprising:

Method for synchronising and rendering multimedia streams

The current-to-voltage converter includes an input for the current to be converted, an output for the converted voltage, a current-to-voltage conversion resistor arranged between the output and a reference potential, a processing circuit including a transistor, the input being connected to the output via the transistor, a twin circuit including components identical to and disposed in a similar way to those of the processing circuit, a voltage follower connected at the input to the processing circuit and at the output to the twin circuit, and means for reinjecting the current at the output of the follower into the processing circuit.

Current-to-voltage converter, amplifier input stage and corresponding amplifier

An amplifier including: an output stage having two first power supply terminals capable of receiving a first voltage defined by first positive and negative variable potentials with respect to a reference potential; and a circuit for controlling the current in transistors of the output stage with a reference value, wherein the output stage includes a first and a second MOS transistors in series between the first two terminals, the junction point of this series association defining an output terminal of the amplifier; the control circuit includes two measurement MOS transistors having their respective sources and gates coupled to the respective sources and gates of the first and second transistors of the output stage; at least one control branch, comprising transistors in series between two terminals of application of a second voltage, defines nodes connected to the gates of the output transistors, said second voltage being greater than the first one.

Control of minimum current in output transistors of an amplifier output stage

A method generates a reference voltage by steps including: generating a reference signal from a voltage source; generating a comparison signal of the reference signal with a voltage reference; sampling the comparison signal; adjusting a numerical value as a function of the result of the comparison and of the numerical value; and converting the current numerical value into a voltage corresponding to the reference voltage.

Reference voltage generator for biasing an amplifier

A method and corresponding circuit that adjusts the gain of an audio output stage having a class D amplifier, this method including the steps of setting the gain to a nominal value, analyzing an output signal during successive clock periods, counting the number of clock periods during which the signal is in a state corresponding to a saturation, decreasing the gain if the number reaches, before the end of a first time interval, a value corresponding to a first percentage, maintaining the gain constant if, at the end of a second time interval, different from the first interval, the number corresponds to a second percentage being comprised between the first percentage and a third percentage, and increasing the gain if, at the end of the second time interval, the number corresponds to a fourth percentage, lower than the third percentage.

Growing community of inventors

Grenoble, France

Alexandre Huffenus