Circuit carrying out temperature compensation on bias voltage of avalanche photodiode

An avalanche photoelectric and temperature compensation technology, applied in circuits, electrical components, semiconductor devices, etc., can solve the problems of environmental temperature effects of avalanche photodiodes, and achieve the effects of low power consumption, low cost and small size

Inactive Publication Date: 2010-08-11
CHINA JILIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to solve the problem that the avalanche photodiode is easily affected by the ambient temperature, and provide a low-cost circuit for temperature compensation of the bias voltage of the avalanche photodiode

Method used

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  • Circuit carrying out temperature compensation on bias voltage of avalanche photodiode
  • Circuit carrying out temperature compensation on bias voltage of avalanche photodiode

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Embodiment Construction

[0010] refer to figure 1 , the circuit for temperature compensation of the avalanche photodiode bias voltage includes: first resistor R1, second resistor R2, third resistor R3, fourth resistor Rz, fifth resistor Rc, potentiometer VR1, negative temperature coefficient thermistor Resistor RT, Zener tube Dz, first transistor T1 and second transistor T2, first resistor R1, potentiometer VR1 and second resistor R2 are connected in series in sequence, after negative temperature coefficient thermistor RT and third resistor R3 are connected in parallel One end of the parallel circuit is connected to the other end of the second resistor R2, the other end of the parallel circuit is connected to one end of the regulator tube Dz and grounded, the movable end of the potentiometer VR1 is connected to the base of the second transistor T2, and the second transistor The emitter of T2 is connected in common with one end of the fourth resistor Rz and the other end of the regulator Dz, the collec...

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PUM

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Abstract

The invention discloses a circuit carrying out temperature compensation on the bias voltage of an avalanche photodiode, comprising a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a potentiometer, a negative temperature coefficient thermosensitive resistor, a voltage-regulator tube, a first crystal triode and a second crystal triode. In the circuit, a thermosensitive resistor feedback sampling part is formed by the first resistor, the second resistor, the potentiometer, the negative temperature coefficient thermosensitive resistor and the third resistor; a reference voltage part is formed by in series connecting the fourth resistor with the voltage-regulator tube; and a comparison and amplification part is formed by the second crystal triode and the fifth resistor connected with the collecting electrode of the second crystal triode. The thermosensitive resistor feedback sampling part samples output bias voltage; the comparison amplification part compares feedback sampling voltage with reference voltage and outputs to the first crystal triode in an amplifying way; and the first crystal triode realizes the regulation of the output bias voltage according to environment temperature. The temperature compensation circuit can effectively realize the temperature compensation of the bias voltage of the avalanche photodiode and has lower cost and power consumption and smaller volume compared with the traditional thermostatic apparatus.

Description

technical field [0001] The invention relates to a temperature compensation circuit, in particular to a circuit for temperature compensation of avalanche photodiode bias voltage. Background technique [0002] Avalanche photodiode (APD) is a highly sensitive photoelectric conversion device, which is widely used in distributed optical fiber temperature sensor, optical communication, laser ranging and other fields. When the avalanche photodiode is working normally, it needs to add a reverse bias voltage of tens to hundreds of volts to make it enter the avalanche region to obtain the best sensitivity. The optimal bias voltage is generally proportional to the ambient temperature. Higher, the higher the optimal reverse bias voltage required, and vice versa. This feature of the avalanche photodiode makes it greatly affected by the ambient temperature in specific applications. When the reverse bias operating voltage remains unchanged and the ambient temperature rises, the sensitivit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01L31/02H01L31/107
Inventor 余向东
Owner CHINA JILIANG UNIV
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