Stmicroelectronics (grenoble 2) Sas

Stmicroelectronics S.a.

Stmicroelectronics S.r.l.

Stmicroelectronics (alps) Sas

Stmicroelectronics (grenoble) Sas

Stmicroelectronics (rousset) Sas

Serge Ramet

Michel Ayraud

Tiziano Chiarillo

Philippe Level

Serge Pontarollo

Sandrine Nicolas

MarcoOrazio Cavallaro

Franck Badets

Marco Orazio Cavallaro

Danika Perrin

Sébastien Rieubon

Philippe Jouen

S&eacute;bastien Rieubon

Reiner Welk

Pascal Triaire

Laurent Camino

Flavia Amorosa

Damien Giot

Daniel Subiela

Cedric Rechatin

An electronic circuit comprises capacitive structures that are connected to one or a plurality of nodes, where each of the capacitive structures is formed by a capacitor or by a plurality of capacitors electrically connected in parallel. The electronic circuit further comprises additional capacitors that are each connected to the one or plurality of nodes. For at least one distance between capacitors, the capacitive structures have a same average of values defined, for each capacitor of each capacitive structure, by the number of capacitors of the circuit connected to the one or plurality of nodes and located at the distance from the capacitor of the capacitive structure.

Electronic circuit with a set of weighted capacitances

In an embodiment, a differential amplifier includes: an input stage; an output stage coupled to the input stage, the output stage having first and second output terminals; and a feedback circuit coupled to the output stage, where the feedback circuit is configured to dynamically adjust a bias current of the output stage based on voltages of the first and second output terminals.

Common-mode loop controlled fully-differential adaptive class-A amplifier

A local oscillator device includes an oscillator module including a first inductive element and a capacitive element coupled in parallel with the inductive element. A frequency divider is coupled to the oscillator module for delivering a local oscillator signal. The local oscillator device includes an autotransformer including the first inductive element and two second inductive elements respectively coupled to the terminals of the first inductive element and to two output terminals of the autotransformer, the output terminals being further coupled to input terminals of the frequency divider.

Low power local oscillator

The transmission device comprising a transmit stage configured to deliver a transmission signal on an input-output node of an antenna and comprising a power transistor coupled to the input-output node and configured to amplify a signal to be transmitted. The device comprises a receive stage configured to receive a reception signal on the input-output node and comprising an attenuator circuit configured to attenuate the reception signal. The attenuator circuit comprising the power transistor and a control circuit able to place the power transistor in a triode mode.

Attenuator device in a radio frequency transmission stage

An integrated circuit includes a first stage configured to receive a bias current. A current regulation loop includes a transimpedance amplifier having a first transistor, and a second transistor having a gate coupled to a gate of the first transistor. The first transistor and the second transistor are configured to compare the bias current with a reference current, and to generate a regulation voltage on an output node of the transimpedance amplifier. A capacitor is coupled between the output node of the transimpedance amplifier and the gates of the first and second transistors.

Biasing current regularization loop stabilization

A class AB operational amplifier includes an input stage, an output stage and a level shifter stage to control the quiescent current of the output stage and to transfer the signal from the input stage to the output stage, and a control circuit of the level shifter stage. The control circuit includes a transistor differential pair having a differential input terminals and the differential voltage at the differential terminals of the differential pair controls the level shifter stage.

High performance class AB operational amplifier

A phase-locked loop double-point modulator may include a frequency divider having a ratio which can be changed by a first modulation signal, and an oscillator, a frequency of which can be changed by a second modulation signal correlated to the first modulation signal. A calibration circuit may be configured, in a calibration mode, to match the gains of the first and second modulation signals based on frequency measurements of the oscillator for two different calibration values of the second modulation signal. The phase-locked double-point modulator may also include an attenuator having a constant ratio greater than 1 and placed in the path of the second modulation signal, and a selector switch configured to be controlled by the calibration circuit to reduce the ratio of the attenuator in the calibration mode.

Double-point modulator with accurate and fast gain calibration

A fully differential operational amplifier includes a differential input stage, at least one output stage and a common-mode feedback circuit connected with the input stage. The differential input stage includes a differential pair of transistors and a bias circuit for the differential pair of transistors. A start-up circuit operates to detect an operating condition of the differential pair of transistors of the input stage and in response thereto turn on the bias circuit.

Fully differential operational amplifier with common-mode feedback circuit

An oscillator comprises an inverter, with a resonator connected between an input and an output of the inverter. A transistor external to the inverter is connected in a current mirror mode with a transistor of the inverter so that the inverter's transistor copies the current of the external transistor. The external transistor has its drain terminal connected to the gate terminals of the inverter's transistor and of the external transistor. A current source is connected to the gate terminal of the inverter's transistor, and a switch is connected between the drain and gate terminals of the external transistor. Circuitry controls the switch so as to open the connection between the drain and gate terminals of the external transistor at the beginning of a start-up phase of the oscillator.

Crystal oscillator with fast start-up and low current consumption

An analog switch including at least one first MOS transistor capable of transferring a signal from a first terminal to a second terminal; a connection circuit for bringing a substrate terminal of the first transistor to a voltage which is a function of the voltages of the first and second terminals; and a circuit for controlling a control voltage of the first transistor with the signal.

Analog switch

An amplifier having an output stage with a complementary pair of first and second transistors each coupled to an output node of the amplifier; control circuitry arranged to provide a control signal at a control node of the first transistor based on the voltage at an input node of the amplifier; and adjustment circuitry arranged to adjust the control signal to maintain the current through the first transistor above a minimum value.

Amplifying circuit

The present invention relates to an RF integrated circuit comprising a frequency synthesizer and a QAM modulator for modulating a baseband signal of frequency F, the frequency synthesizer supplying to the QAM modulator an output signal of frequency Fadjustable with a frequency step &#x394;F, for forming a carrier signal of the QAM modulator. According to the present invention, the frequency synthesizer is a Vernier effect frequency synthesizer comprising an auxiliary frequency synthesizer supplying an auxiliary signal of frequency Fadjustable with a frequency step &#x394;Fand a main frequency synthesizer having a phase-locked loop bandwidth at least two times higher than the frequency step &#x394;Fof the auxiliary signal.

RF integrated circuit comprising a frequency synthesizer not very sensitive to injection locking

An electronic circuit includes at least one differential pair of transistors, a control transistor switch, a first current source and a second current source. The second current source is connected to a common emitter node of the pair of transistors in order to accelerate the discharge of parasitic capacitances during a switching operation.

Electronic circuit with a differential pair of transistors and logic gate comprising such a circuit

An amplitude control device for a signal output by an oscillator includes a rectification circuit for rectifying the output signal, and a differential amplification circuit for generating a biasing current control signal for the oscillator. The biasing current control signal is based upon the output signal from the rectification circuit and a reference voltage. A dividing bridge and an adder are designed so that only a fraction of the reference voltage is used to define the amplitude of the oscillations. The contribution made to the oscillator phase noise by the reference voltage noise is considerably reduced.

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Jarrie, France

Serge Ramet