Pixel for infrared imager integrating a bdi bias and an active reset

An imaging device including a plurality of detection elements, each detection element being formed from a photodetector associated with and connected to a readout circuit of a signal generated by the photodetector, the readout circuit being equipped with an integration capacitor for storing charges from the photodetector, the readout circuit further comprising:

• an active reset stage of the integration capacitor equipped with transistors forming a first current amplifier of a first current source,
• a buffered direct injection bias stage of the photodetector equipped with transistors forming a second current amplifier of a second current source,
• a switching circuit comprising a coupling stage integrated in the readout circuit, the switching circuit being controlled by control signals and being configured to:
• during a reset phase of the integration capacitor corresponding to a first state of said control signals:
• couple said first current source to the integration capacitor and activate the first current amplifier while uncoupling said second current source of the photodetector and deactivating the second amplifier,
• during an integration phase of a current from the photodiode and corresponding to a second state of said control signals, couple said second current source to the photodetector and activate the second current amplifier while uncoupling said first current source of the integration capacitor and deactivating the first amplifier.