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Weak signal reading-out analog signal link structure for short wave infrared detector

An analog signal, short-wave infrared technology, used in electrical radiation detectors, instruments, measuring devices, etc., can solve problems such as difficult to implement, complex structure, difficult to achieve dynamic range, noise suppression requirements, etc. Output swing, the effect of improving dynamic range

Inactive Publication Date: 2012-12-12
SHANGHAI INST OF TECHNICAL PHYSICS - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The conventional CTIA structure input stage has good injection efficiency and noise performance, but the existing structure is complex and difficult to realize in a limited area
It is difficult for the general column common structure to meet the requirements in terms of dynamic range and noise suppression
The output stage of a common source follower cannot meet the frame rate

Method used

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  • Weak signal reading-out analog signal link structure for short wave infrared detector
  • Weak signal reading-out analog signal link structure for short wave infrared detector
  • Weak signal reading-out analog signal link structure for short wave infrared detector

Examples

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Effect test

Embodiment Construction

[0026] 1) The preamplifier circuit of the readout circuit adopts a CTIA structure, which includes M1, M2, M3, integrating capacitors, and sampling capacitors. The size is determined according to the needs, and the recommended width to length ratio is 1 / 10, 1 / 5, 1 / 10.

[0027] 2) Unity gain op amps include M1~M5, and the recommended sizes are 10 / 1, 10 / 1, 20 / 1, 20 / 1, 20 / 1.

[0028] 3) The clamping voltage V in the correlated double sampling structure CDS Take 4~5V, C1 takes 1~2p.

[0029] 4) In the structure of the charge amplifier, C1 is 1pF, and C2 can be 0.4~2pF according to the amplification ratio.

[0030] 5) Complementary output stage structure P-UGA\N-UGA are adopted figure 2 For the structure of the unity gain amplifier, the recommended aspect ratios are 200 / 1, 200 / 1, 400 / 1, 400 / 1, 400 / 1.

[0031] The application design scheme of the operational amplifier CTIA structure of the analog signal chain and the cascode structure of the current source load in the readout ci...

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Abstract

The invention discloses an analog signal link circuit for a high-frame frequency reading-out integrated circuit system for collecting and processing weak signals of a short wave infrared detector and belongs to the technical field of integrated circuit design. The analog signal link circuit is characterized in that a reading-out circuit adopts an analog signal link structure. The analog signal link circuit has the concrete scheme that a current source loaded CTIA (capacitance trans-impedance amplifier) structure input stage in a cascade structure is adopted in a unit structure, a CDS (correlated double sampling) module and a charge amplifying module are arranged in a row public structure, and a public output stage adopts a complementary output stage. The CDS structure is integrated in the analog signal link, the serious low-frequency noise of a reading-out circuit of the infrared detector is filtered out, and the technical support is provided for the short wave infrared detector in applications of high resolution ratio and the like.

Description

technical field [0001] The invention relates to the technical field of mixed-signal integrated circuits, in particular to an analog signal chain structure for short-wave infrared detector weak signal readout, which is used in short-wave infrared detector array (Infrared Focus Plane Array-IRFPA) systems with photoelectric weak The high frame frequency readout integrated circuit of the signal function can realize the integration, sampling, amplification and output of the weak light response signal of the short-wave infrared detector. Background technique [0002] The infrared detector array is the core device in the infrared imaging system. An infrared detector array generally consists of two parts: an infrared detector array and a readout circuit. After receiving the incident infrared radiation, the infrared detector generates a photocurrent related to the performance of the incident infrared radiation, and transmits it to the corresponding readout circuit unit. The traditi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01J5/22G01J5/24G01J5/06
Inventor 王攀丁瑞军陈洪雷叶振华张君玲黄爱波
Owner SHANGHAI INST OF TECHNICAL PHYSICS - CHINESE ACAD OF SCI
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