Sgs-thomson Microelectronics S.r.l.

Istituto Nazionale Di Fisica Nucleare

Gianluigi Pessina

Alberto Gola

Fabrizio Stefani

Daniel V Camin

Ezio Previtali

The amplifier comprises a first field effect transistor controlled by the input signal of the amplifier and a current generator for the supply of said first transistor. The latter is biased so as to operate in its linear region and in cascade with it there is provided at least one second field effect transistor biased in a similar way, suitable for raising the output impedance of the amplifier, and thus its gain, to a value corresponding to the desired use.

High-gain amplifier with low noise and low power dissipation, using

The pilot circuit comprises an R-C network consisting of a condenser inserted between a gate terminal of the MOS transistor and ground and a resistance for charging said condenser. In parallel with the resistance there is placed an SCR circuit with associated threshold circuit which permits firing of the SCR circuit when the charge voltage of the condenser reaches a preset threshold.

Pilot circuit with integrated circuit with preset firing delay for MOS

An improved power stage with increased output dynamics. The stage comprises a power amplifier having a first inverting input, a second non-inverting input, an output to be connected to a load and a feedback network comprising a first resistor connected between the inverting input and the output of the power amplifier and a second resistor connected between the first inverting input and a first line set to a first reference voltage by means of a voltage generator with preset values. The stage furthermore comprises an input voltage generator generating an input voltage signal to be amplified and connected between the second non-inverting input and a second line set to a second reference voltage different from said first reference voltage. In order to increase the output dynamics, in particular in the case of low power supply voltage, said voltage generator arranged between the second resistor and said input voltage generator, and generating a voltage which is variable in inverse proportion to the input voltage signal, with respect to the second reference voltage.

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Lainate, Italy

Gianluigi Pessina