Acquisition circuit comprising a buffer capacitor
AssigneeSociete Francaise de Detecteurs Infrarouges-Sofradir
InventorGilbert Decaens
Life of this patent
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Abstract
The acquisition circuit comprises a second and third electronic switch connected in series between a photodetector and a first input terminal of an amplifier. A reference voltage is applied to a second input terminal of the amplifier, the reference voltage being applied between the photodetector and the second electronic switch by means of a fourth electronic switch. An integration capacitor and a first electronic switch are connected in parallel between the first input terminal and an output terminal of the amplifier. A buffer capacitor is connected between a common terminal of the second and third electronic switches and a secondary voltage. The electrical capacitance of the buffer capacitor is at least equal to that of the integration capacitor.
Claims5
An acquisition circuit comprising:
- an amplifier comprising an input terminal and an output terminal,
- an integration capacitor and a first switch connected in parallel between the input terminal and the output terminal of the amplifier,
- at least two pixels connected to the input terminal, each pixel comprising:
- a photodetector,
- second and third switches connected in series between the photodetector and the input terminal of the amplifier, wherein the second and third switches have a common terminal,
- a buffer capacitor connected to said common terminal, wherein the capacitance of the buffer capacitor is at least equal to that of the integration capacitor,
- a fourth switch connected between a reference voltage source and the photodetector.
Dependencies are inferred from the claim text.