Stage background inhibiting infrared focal plane unit circuit

Abstract

The invention relates to a stage background inhibiting infrared focal plane unit circuit which is characterized by comprising an injection circuit, an integrating capacitor circuit, a background subtracting current circuit and a row selection control circuit, wherein the output end of an infrared detector is connected with the input end of the injection circuit; the output end of the injection circuit is connected with the input end of the integrating capacitor circuit; the output end of the integrating capacitor circuit and the output end of the background subtracting current circuit are connected with the input end of the row selection control circuit; the output end of the row selection control circuit is connected with a following signal processing circuit; the first input end and thesecond input end of the background subtracting current circuit are respectively connected with bias voltage VB1 and bias voltage VB2; and the charge accumulated on an integrating capacitor by background current is subtracted by the stage conduction of the background subtracting current circuit in the process of integration so as to realize background inhibition.

Description

technical field [0001] The invention relates to a readout circuit in an infrared imaging system, in particular to a staged background suppression infrared focal plane unit circuit, which belongs to the technical field of microelectronics and optoelectronics. Background technique [0002] Infrared imaging technology, also known as thermal imaging technology, is a technology that uses the property that any object above absolute zero emits infrared rays to convert invisible infrared radiation into visible images. The infrared imaging device converts the self-radiation difference (thermal image) of the scene into a visible light image by means of a detector sensitive to infrared radiation (ie, an infrared detector), thereby extending the human visual range to the infrared band. At present, infrared imaging technology is being increasingly widely used in military, space technology, medicine and related fields of national economy. The infrared focal plane array component is a key...

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to solve the problem of high non-uniformity of background suppression between existing unit circuits in the infrared readout circuit, and to provide a staged background suppression infrared focal plane unit circuit to effectively reduce the background suppression between unit circuits Non-uniformity; the unit circuit uses the background subtraction current circuit to conduct in stages during the integration process to subtract the charge accumulated by the background current on the integration capacitor to achieve background suppression

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