Digitized photoelectric detector sensing circuit

Abstract

The invention discloses a digitized photoelectric detector sensing circuit provided with a plurality of signal paths. The digitized photoelectric detector sensing circuit comprises a front end sensingunit consisting of a plurality of unit circuits, a column-shared integrating circuit connected with the front end sensing unit, a high-speed and high-precision comparator connected with the column-shared integrating circuit, a delay control unit connected with the high-speed and high-precision comparator, a counter connected with the delay control unit and an output buffering stage connected withthe counter, the output buffer stage is further connected with a column selection register, the output buffering stage forms an output end, and the plurality of unit circuits are further respectivelyconnected with a row selection register, wherein each signal path comprises one unit circuit. The digitized photoelectric detector sensing circuit utilizes an analogue-digital signal conversion technology of pulse frequency coding to advance the position from the analogue-to-digital conversion so as to efficiently reduce the analogue signal processing circuit, eliminate the column fixing mode noise and the column sensing noise in the analogue signal sensing circuit and improve the sensing signal-to-noise ratio.

Description

technical field [0001] The invention relates to a signal processing technology of a photodetector focal plane array readout circuit. In particular, it relates to a digitized photodetector readout circuit which eliminates column fixed pattern noise and column readout noise in the analog signal readout circuit and improves the readout signal-to-noise ratio. Background technique [0002] The photodetector focal plane array consists of a detector array and a readout circuit. The function of the readout circuit is to integrate the weak signal output by the infrared detector, amplify, denoise and parallel / serial convert, and then transmit it to the A / D for digital conversion of the analog signal. The performance of the readout circuit will directly affect the quality of the infrared focal plane. With the continuous increase of infrared focal plane arrays and the continuous improvement of the integration level of the entire imaging system, higher requirements are placed on the pe...

AI Technical Summary

Problems solved by technology

Digital signal transmission after pixel-level A / D conversion can greatly reduce noise interference and improve signal processing speed, but the area and power consumption of the system will be large

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