Pixel circuit of infrared detector and driving method

Abstract

The invention discloses a pixel circuit of an infrared detector and a driving method, and belongs to the field of infrared detector circuit design. The pixel circuit comprises an integral control circuit, a signal transmission circuit, a reset circuit, a gating read-out circuit and an integral capacitor. According to the pixel circuit of the infrared detector and the driving method provided by theinvention, the reset voltage and the signal voltage can be read out in a time-sharing manner in a short time interval of the same frame, and thermal noise signals contained in two times of sampling in the short time interval of the same frame are also basically the same, so the difference between the two times of sampling voltages is calculated through a subsequent circuit; theoretically, the thermal noise of the pixel circuit can be completely eliminated.

Description

technical field [0001] The invention belongs to the technical field of infrared detectors, and more specifically relates to a pixel circuit and a driving method of an infrared detector. Background technique [0002] Generally speaking, the infrared detector is divided into an infrared sensing part and a CMOS integrated circuit part. The parameter design of the CMOS integrated circuit is inseparable from the light response of the infrared sensing part. Therefore, according to the relevant parameters such as the photoresponse of the infrared sensing part, it is very important to design a dedicated CMOS integrated circuit for the construction of an infrared detector. And with the development of the times, many military and civilian application scenarios of infrared detectors require detectors to detect very weak infrared light, so how to read infrared sensing signals under weak light is a new challenge. [0003] figure 1 It is a schematic structural diagram of an existing in...

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Problems solved by technology

[0005] Aiming at the defects and improvement needs of the prior art, the present invention provides an infrared detector pixel circuit and a driving method, the purpose of which is to realize real correlated double sampling, eliminate the thermal noise introduced in the reset process, and solve the problem of under-light conditions. The problem that the signal is truncated due to the small integral voltage of the pixel, and at the same time reduce the 1 / f noise of the pixel point circuit

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