Stmicroelectronics S.a.

Sgs-thomson Microelectronics S.a.

Frédéric Goutti

Sébastien Laville

Vincent Rabary

A circuit adjustable after packaging includes a functional circuit supplied with a power potential and a reference potential and has at least one parameter adjustable by programming at least one programmable element and a circuit to program the programmable element of the functional circuit. The adjustable circuit also includes a limiter circuit to limit the voltage between the power supply potential and the reference potential to an adjustable limiting voltage, and a circuit to adjust the limiting voltage. After adjusting a parameter of the functional circuit, the limiting voltage of the limiter circuit is adjusted.

Circuit adjustable after packaging having a voltage limiter and method of adjusting same

A power amplifier circuit comprising at least one first amplifier having a first input receiving an input voltage through at least one first coupling capacitor and connected to an output of the first amplifier, and having a second input, separate from the first input, receiving a reference voltage supplied by a time constant circuit comprising a decoupling capacitor, at least one first controllable switch connecting the first and second inputs.

Audio amplifier circuit with suppression of unwanted noise when powered on from standby

An amplifier includes two complementary differential input stages and a first current source that is switched as a function of the input voltage of the amplifier in order to render active one or the other of the input stages by establishing the quiescent current of the input stage. A folded cascode stage has two cascode transistors whose currents are determined by a bias voltage of these transistors and reduced by the currents circulating in the output branches of a first of the differential input stages. Circuitry switched at the same time as the first current source for maintaining a constant current in the cascode transistors when one of the differential stages changes between an active state and an inactive state.

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Grenoble, France

Frédéric Goutti