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Staged background suppression method of ultrared focal plane readout circuit

A technology of infrared focal plane and readout circuit, which is applied in the direction of TV, color TV, electrical components, etc., can solve the problem of high background suppression non-uniformity, reduce background suppression non-uniformity, improve the ability to detect weak signals, and realize The effect of background suppression

Inactive Publication Date: 2010-02-03
江苏久日数控机床有限公司 +2
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  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to solve the problem of high background suppression non-uniformity in existing background suppression methods in infrared readout circuits, and to provide a staged background suppression method for infrared focal plane readout circuits

Method used

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  • Staged background suppression method of ultrared focal plane readout circuit
  • Staged background suppression method of ultrared focal plane readout circuit
  • Staged background suppression method of ultrared focal plane readout circuit

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Embodiment Construction

[0021] see figure 1 , figure 2 The unit circuit of the infrared focal plane readout circuit in the method of the present invention is composed of the following parts: injection circuit 2, integration capacitor circuit 3, background subtraction current circuit 4, row selection control circuit 5. Detector 1 (in the prior art, infrared detectors such as QWIP detectors, HgCdTe detectors, and PST detectors can be used), converts infrared radiation signals into current signals. The injection circuit 2 contains an operational amplifier, a P-type MOS tube M INJ , the two constitute a buffered direct injection circuit (BDI injection circuit), which can provide a stable bias voltage for the detector and has extremely high injection efficiency. Integrating capacitor circuit 3 contains N-type MOS transistor M INT , N-type MOS tube M RST , integrating capacitance C INT . Among them, the N-type MOS tube M INT As the integral control switch tube, in the integral control signal Φ INT...

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Abstract

The invention relates to a staged background suppression method of an ultrared focal plane readout circuit. The staged background suppression method is characterized in that unit circuits in the ultrared focal plane readout circuit comprise an injection circuit, an integral capacitor circuit, a background current reduction circuit and a row-selection control circuit, wherein the output end of a 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 integral capacitor circuit; the output end of the integral capacitor circuit, the output end of the background current reduction circuit and the input end of the row-selection control circuit are mutually connected; the input end of the background currentreduction circuit is connected with an input voltage VB; and the output end of the row-selection control circuit is connected with a subsequent signal-processing circuit. The background current reduction circuit is utilized to be switched on by stages in an integral process so that a charge packet is reduced form the integral capacitor circuit every time when the background current reduction circuit is switched on, and charges collected on an integral capacitor by a background current are eliminated for a plurality of times to realize background suppression.

Description

technical field [0001] The invention relates to a background suppression method used in an infrared imaging system, in particular to a stage-by-stage background suppression method for an infrared focal plane readout circuit, which belongs to the technical field of microelectronics and optoelectronics. Background technique [0002] Infrared imaging technology is a technology that converts invisible infrared radiation signals into visible images. It 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 device in modern infrared imaging technology, and it includes two parts: an infrared detector and an infrared focal plane readout circuit. The main function of the readout circuit is to convert, amplify, and transmit the signal output by the infrared detector, and at the same time provide various low-noise bias voltages required for the infrared detector. A common reado...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01J5/06H04N5/33
CPCH04N25/77
Inventor 夏晓娟周杨帆文勇苏鹏飞孙伟锋陆生礼时龙兴
Owner 江苏久日数控机床有限公司
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