Photoelectric differential detector with high common-mode rejection ratio (CMRR)

A high common-mode rejection and detector technology, which is applied in the direction of photometry and measurement circuits using electric radiation detectors, can solve the problems of single technology, inability to reduce and eliminate photodiode response differences, etc.

Inactive Publication Date: 2013-02-06
SUN YAT SEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, due to the single technology, the existing technology cannot reduce or eliminate the difference in the response of the photodiode and the difference in the amplifier circuit, so that the common mode rejection ratio is limited to 40db

Method used

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  • Photoelectric differential detector with high common-mode rejection ratio (CMRR)
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  • Photoelectric differential detector with high common-mode rejection ratio (CMRR)

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Embodiment Construction

[0027] According to the above principles and diagrams, the present invention provides a specific implementation method.

[0028] a) Twin photodiodes S1336-10BQ with a pairing accuracy of 1% from Hamamtsu are selected as the photodiodes D21 and D22 of the differential photodetector, which have the advantages of wide spectral response, large receiving area, and ultra-low noise.

[0029] b) A precision adjustable resistor T93YA101KT20 from Vishay Company with a resistance value of 100Ω is selected as the adjustable resistor VR26 of the differential fine-tuning circuit 28 .

[0030] c) Select two metal film resistors CMF5010K000BEEB from Vishay with a resistance value of 10Ω as the fixed resistance resistors R23 and R24 of the differential trimming circuit 28 .

[0031] d) Select TI's OPA129U low-input bias current, low-noise operational amplifier as the OPA27 of the photoelectric differential detector.

[0032] e) Select Vishay's CMF55100K00BEEB metal film resistor with a resist...

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Abstract

The invention discloses a photoelectric differential detector with high common-mode rejection ratio (CMRR). The device comprises two photoelectric diodes D21 and D22, a differential fine adjusting circuit 28 and a transimpedance amplifying circuit 29, wherein the two photoelectric diodes D21 and D22 are connected with each other in series to form a differential circuit; differential operation is carried out on two optical signals, so as to obtain a differential photocurrent; photocurrent responding speeds of the two photoelectric diodes D21 and D22 can be highly approximate or equal to each other through adjusting the differential fine adjusting circuit 28; and I-V amplification is carried out on the differential photocurrent by the transimpedance amplifying circuit 29, so as to obtain a differential voltage signal. According to the invention, the difference between the two photoelectric diodes D21 and D22 is skillfully adjusted by using the differential resistance fine adjusting circuit 28, so that the detector obtains advantages of high CMRR, high signal to noise ratio (SNR), low cost and so on; and the photoelectric differential detector with the high common-mode rejection ratio, disclosed by the invention, can be widely used for experiments, such as high-accuracy laser spectral measurement, high-accuracy semiconductor magneto-optic Kerr rotation angle measurement, high-accuracy semiconductor Faraday rotation angle measurement and so on.

Description

technical field [0001] The present invention relates to a photoelectric differential detection device, in particular to a photoelectric differential detection device with a high common-mode rejection ratio and its realization method, which is characterized in that the differential fine-tuning circuit is used to compensate the difference of the photodiode to improve the photoelectric differential pair tube common mode suppression ratio. It has important application value in high-precision and low-noise laser measurement. Background technique [0002] With the development of laser experiments, factors such as laser power drift, shot noise, and parasitic modulation have more prominent effects on the measurement of laser experiments, and low-noise and high-resolution photoelectric detection is also more important, especially for low-frequency modulation. Laser measurement experiments are greatly affected by this. Photoelectric differential detection can use circuit means to su...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01J1/44G01J1/46
Inventor 王自鑫赖天树李佳明杨利灿
Owner SUN YAT SEN UNIV
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