Societe Francaise De Detecteurs Infrarouges-sofradir

Société Française De Détecteurs Infrarouges—sofradii

Lynred

Frédéric Salvetti

Nicolas Ricard

The detection device comprises a photodetector configured to transform an electromagnetic signal into a representative electric signal. The detection device also comprises an amplifier having a first input terminal connected to a first terminal of the photodetector. An integration capacitor is connected to the output terminal of the amplifier and to the first input terminal of the amplifier. A first source of a reference voltage is connected to a second input terminal of the amplifier. A second source of a detector voltage is connected to a second input terminal of the photodetector. The first and second voltage sources are correlated so as to correlate the noise components.

Detection device having a photodetector connected to a terminal of an amplifier so as to reverse bias the photodetector

The detection circuit with correlated double sampling comprises two transimpedance amplifiers connected by means of a sampling capacitor. A photodiode is connected to the input of the first transimpedance amplifier. The circuit comprises an anti-blooming circuit connected between the input and output of the first transimpedance amplifier. The anti-blooming circuit comprises means for comparing the output voltage of the first transimpedance amplifier with a setpoint voltage defined by means of the output voltage of the second transimpedance amplifier. The means for comparing are connected to means for applying a feedback current to the input of the first transimpedance amplifier when the difference between the output voltage and the setpoint voltage reaches a limit value.

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Montbonnot, France

Frédéric Salvetti