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Preamplification circuit of photodiode

A preamplifier circuit, photodiode technology, applied in the direction of differential amplifier, DC-coupled DC amplifier, etc., can solve the problem of unconditional detection of two photodiodes, and achieve the effect of improving photoelectric conversion accuracy and suppressing common mode interference.

Inactive Publication Date: 2014-08-13
SHANGHAI INST OF OPTICS & FINE MECHANICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0009] 2. In some environments, due to the limitation of the optical path, it is not possible to use two photodiodes to detect the signal at the same time

Method used

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  • Preamplification circuit of photodiode

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Embodiment Construction

[0018] The present invention will be further described below in conjunction with the accompanying drawings.

[0019] see first figure 1 , figure 1 It is a structural diagram of the photodiode preamplifier circuit of the present invention. It can be seen from the figure that the photodiode preamplifier circuit of the present invention is composed of a photoelectric conversion module, an instrument amplification module and a voltage follower module. The photoelectric conversion module is composed of a photodiode A1 , resistor R1, first capacitor C1, and voltage regulator Vcc, the instrument amplifier module is composed of instrument amplifier A2, potentiometer R2, second capacitor C2, third capacitor C3, and first power supply V1, and the voltage follower module It is composed of an operational amplifier A3, a fourth capacitor C4, a fifth capacitor C5, and a second power supply V2; the connection relationship of the above-mentioned components is: the negative pole of the photod...

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Abstract

A preamplification circuit of a photodiode is characterized by comprising a photoelectric conversion module, a meter amplifying module and a voltage following module, wherein the photoelectric conversion module is composed of a photodiode, a resistor, a first capacitor and a voltage stabilizing source, the meter amplifying module is composed of a meter magnifier, a potentiometer, a second capacitor, a third capacitor and a first power supply, and the voltage following module is composed of an operation amplifier, a fourth capacitor, a fifth capacitor and a second power supply. According to the preamplification circuit provided by the invention, on one hand, common mode interference during the suppress signal magnification process can be effectively restrained, the switching accuracy is improved, and on the other hand, the magnification ratio can be adjusted, the use is flexible and convenient, and the structure is simple.

Description

technical field [0001] The invention relates to a photodiode, in particular to a photodiode pre-amplification circuit. Background technique [0002] Photodiodes can output corresponding analog electrical signals according to the illuminance of the received light, so they are widely used in fields such as optical fiber communication, optical fiber sensing, and signal isolation. When the photodiode working in the reverse voltage state is irradiated by light, a low-level photocurrent will be generated. In order to realize further processing, the photocurrent must be amplified and processed. A photodiode and an attached preamplifier circuit constitute a photodetector. [0003] The conversion accuracy is an important indicator of the photodetector. The factors that affect the conversion accuracy of the photodetector mainly come from two aspects. One is the performance index of the photodiode itself, and the other is the signal received during the preamplification process. exter...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03F3/45
Inventor 袁丰华王向朝李中梁
Owner SHANGHAI INST OF OPTICS & FINE MECHANICS CHINESE ACAD OF SCI