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Photoelectric detection circuit noise analysis method

A photoelectric detection and noise analysis technology, applied in the direction of noise figure or signal-to-noise ratio measurement, can solve the problems of low photoelectric conversion efficiency and weak detection ability of photodiodes, and achieve the effect of high photoelectric conversion efficiency and universal applicability

Inactive Publication Date: 2017-03-08
NANJING UNIV OF SCI & TECH
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Problems solved by technology

[0004] However, the existing noise analysis of the photoelectric detection circuit is mostly based on the unbiased condition of the photodiode, and the analysis process is relatively simple. time weak

Method used

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Embodiment Construction

[0023] It is easy to understand that, according to the technical solution of the present invention, those skilled in the art can imagine various implementations of the noise analysis method of the photoelectric detection circuit of the present invention without changing the essence of the present invention. Therefore, the following specific embodiments and drawings are only exemplary descriptions of the technical solution of the present invention, and should not be regarded as the entirety of the present invention or as a limitation or limitation on the technical solution of the present invention.

[0024] In the present invention, the photoelectric detection circuit such as image 3 As shown in , the photodiode is in the reverse biased state, and when performing noise analysis, along the image 3 The middle dotted line divides the photoelectric detection circuit into three modules: photodiode module, triode module, and operational amplifier module;

[0025] 1. Noise analysis...

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Abstract

The invention puts forward a photoelectric detection circuit noise analysis method. A photoelectric diode is in a state of reverse bias. During noise analysis, a whole photoelectric detection circuit is divided into a photoelectric diode module, a triode module and an operational amplifier module which are cascaded. The output noise voltage or current value of each module is calculated; then, the total output noise voltage value of the whole photoelectric detection circuit is calculated according to the principle of cascade; and finally, noise factors are analyzed according to the total output noise voltage value so as to correct circuit parameters. The method can be widely applied to circuits of all cascade structures, and provides reference for the design of a low-noise photoelectric detection circuit to a certain extent.

Description

technical field [0001] The invention belongs to the technical field of photoelectric detection, and specifically relates to a noise analysis method of a photoelectric detection circuit, which is used to obtain an output noise voltage model of a photoelectric detection circuit, and provides certain parameter guidance for reducing circuit noise, and can be widely used in various photoelectric detections occasion Background technique [0002] At present, photoelectric detection technology has been applied to many fields. Ideally, as long as there is an optical radiation signal, the signal can be detected by a photoelectric detection circuit. However, when the detected signal is very weak, the signal is often submerged in the noise. Therefore, the noise analysis of the photoelectric detection circuit is of great significance to improve the detection ability of the photoelectric detection circuit. [0003] figure 1 and figure 2 It is the existing photoelectric detection circu...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R29/26
Inventor 周玉蛟任侃孙爱娟唐彦琴杨锦清王飞
Owner NANJING UNIV OF SCI & TECH