Stmicroelectronics S.r.l.

Giovanni Cali'

Giuseppe Palmisano

Gaetano Cosentino

Pietro Filoramo

Angelo Granata

Felice Alberto Torrisi

Roberto Pelleriti

The present invention refers to a cascode amplifier suitable for amplifying a voltage signal present on the input terminal. The amplifier comprises at least one first transistor comprising a non-drivable input terminal that coincides with the input terminal of the amplifier, a non-drivable output terminal and a drivable terminal connected to a first polarization voltage. The amplifier comprises in addition at least one second transistor comprising a non-drivable input terminal in common with the output terminal of the first transistor, an output terminal non-drivable connected to a second polarization voltage and a drivable terminal. The amplifier also comprises a feedback element placed between the output terminal of the second transistor and the drivable terminal of the first transistor and circuit means coupled between the drivable terminals of the first and of the second transistor and suitable for making the values of voltage on the drivable terminal and on the output terminal of the first transistor substantially the same.

Cascode amplifier

A bandgap voltage generator includes an output node for providing an output voltage, a current mirror coupled between the output node and a voltage reference, and a biasing transistor coupled to the output node. A feedback line includes a feedback transistor coupled to the output node. A current generator biases the feedback transistor by injecting a current into a bias node of the feedback line. A capacitor is coupled between the bias node and the voltage reference. The feedback line includes a circuit coupled between the bias node and the feedback transistor for causing a current to flow through the feedback transistor, and for increasing a resistance of a portion of the feedback line in parallel to the capacitor.

Method of limiting the noise bandwidth of a bandgap voltage generator and relative bandgap voltage generator

A circuit switches a capacitive value in an exclusive manner to a selected integrated amplifier among a plurality of integrated amplifiers. The circuit includes a first current generator connected between a first supply node and a first node of the circuit, and a second current generator connected between a second supply node and a second node of the circuit. The second current generator is electrically in parallel with the capacitor. An array of switches equal in number to the integrated amplifiers are exclusively switched ON for connecting a directly biased diode between the first node and the second node. Each integrated amplifier has a supply node coupled to a connecting node between a respective diode and a respective connecting switch of the array of switches.

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Catania, Italy

Giovanni Cali'