An infrared detector readout circuit based on dark current suppression structure

Abstract

The present invention provides an infrared detector readout circuit based on a dark current suppression structure, comprising: a dark current suppression circuit, an integration circuit, a dual sampling circuit, a source follower, a differential amplifier circuit, and an output buffer circuit electrically connected in sequence, and also comprising a sequential logic circuit; the dark current suppression circuit is used to generate a controllable current that is not affected by temperature changes, and the current is mirrored to offset the dark current of the infrared detector; the sequential logic circuit is used to provide row selection logic, column selection logic, and sampling timing when selecting a target pixel from an infrared detector pixel array; the readout circuit can read out the current signal of the target pixel according to the row selection logic, column selection logic, and sampling timing; the present invention improves the signal-to-noise ratio of the readout system by suppressing dark current, and at the same time realizes the column-by-column readout function based on the sequential logic circuit, which can effectively reduce noise interference between the readout circuits in the array, and is suitable for preparing a large-scale focal plane array readout circuit.