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Background suppression method for infrared reading circuit and circuit thereof

A background suppression and circuit technology, applied in color TV parts, TV system parts, TVs, etc., can solve the problems of low background suppression non-uniformity, high non-uniformity, extra noise, etc., and achieve low background suppression Non-uniformity, eliminates additional noise and power consumption, and is less susceptible to process effects

Inactive Publication Date: 2009-11-18
海安江理工技术转移中心有限公司 +1
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  • Abstract
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  • Claims
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AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to solve the problems of high background suppression non-uniformity and the introduction of extra noise and power consumption in the existing background suppression technology of infrared readout circuits, and provide a background suppression method and circuit for infrared readout circuits with low background suppression non-uniformity, low noise, low power consumption

Method used

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  • Background suppression method for infrared reading circuit and circuit thereof
  • Background suppression method for infrared reading circuit and circuit thereof
  • Background suppression method for infrared reading circuit and circuit thereof

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Embodiment Construction

[0023] see figure 1 , 2 , The present invention is provided with a negative charge packet generator 1 , a detector 2 , an injection circuit 3 , a sample and hold circuit 4 , and a buffer 5 . Negative charge packet generator 1 contains 4 P-type MOS transistors M1, M2, M3, M4 (they are all used as switch tubes) and switch capacitor C S . Among them, through the clock signal Φ 1 、Φ 2 Control the on and off of M1, M2, M3, M4, change C S The amount of charge stored on the upper to provide the negative charge packet required for background suppression; the reference voltage V B adjustable, by adjusting the reference voltage V B The size of the negative charge packet provided by the negative charge packet generator 1 can be determined; the reference voltage V REF Once set, it remains unchanged. Detector 2 contains a high-performance infrared detector that converts infrared radiation signals into electrical current signals. The injection circuit 3 includes a P-type MOS transi...

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Abstract

The invention discloses a background suppression method for an infrared reading circuit and a circuit thereof. The circuit is provided with a negative charge packet generator, a detector, an injection circuit, a sampling hold circuit and a buffer, wherein an output end of the negative charge packet generator is connected with one input end of the injection circuit; and an output end of the detector is connected with the other input end of the injection circuit, an output end of the injection circuit is connected with an input end of the sampling hold circuit, an output end of the sampling hold circuit is connected with an input end of the buffer, and an output end of the buffer is connected with a subsequent signal processing circuit. The method and the circuit adopt the negative charge packet generator to provide a plurality of negative charge packets by stage to reduce charges of background current accumulated on an integrating capacitor, do not need a background current memory of the prior art to generate background reduction current to realize background suppression, have extremely low background suppression non-uniformity, and do not introduce extra noise and power consumption.

Description

technical field [0001] The invention relates to a readout circuit in an infrared imaging system, in particular to a background suppression method for an infrared readout circuit and a circuit thereof, belonging to the technical fields of microelectronics and optoelectronics. Background technique [0002] Infrared radiation is an electromagnetic wave between visible light and microwaves, with a wavelength between 770nm and 1mm, and is outside red light in the spectrum. When infrared radiation propagates in the atmosphere, it will be absorbed and scattered by various components of the atmosphere, which will cause the gradual attenuation of the radiation power. The infrared photon detector mainly works in three bands of 1-3μm, 3-5μm, and 8-13μm. They are called near-infrared band, mid-infrared band and far-infrared band respectively. In infrared imaging applications, according to the photon density of the background radiation of the detection target, there are low background a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N3/15H04N5/33G01J5/06
Inventor 孙伟锋夏晓娟周杨帆谢亮陆生礼时龙兴
Owner 海安江理工技术转移中心有限公司
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