Digitized photoelectric detector sensing circuit

A technology for photodetectors and readout circuits, which is applied in the direction of measuring circuits and using electric radiation detectors for photometry, etc., can solve the problems of large area and power consumption, improve the readout signal-to-noise ratio, and eliminate column fixed modes Noise, the effect of eliminating column read noise

CN101650223AInactive Publication Date: 2010-02-17TIANJIN UNIV
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Publication Date
2010-02-17
Estimated Expiration
Not applicable · inactive patent

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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.
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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...

Examples

Embodiment Construction

[0026] The digitized photodetector readout circuit of the present invention will be described in detail below in conjunction with the accompanying drawings of the embodiments.

[0027] Such as figure 1 As shown, the digitized photodetector readout circuit of the present invention has multiple signal channels, specifically including: a front-end readout unit B composed of a plurality of unit circuits Z, and a column-shared integration circuit C connected to the front-end readout unit B , a high-speed high-precision comparator D connected to the column sharing integration circuit C, a delay control unit H connected to the high-speed high-precision comparator D, a counter E connected to the delay control unit H, and an output buffer stage G connected to the counter E , the output buffer stage G is also connected to the column selection register F, the output buffer stage G constitutes the output terminal, and the plurality of unit circuits Z are also respectively connected to the...