Bias voltage full-automatic temperature compensation system for APD array chip

Abstract

The invention discloses a bias voltage full-automatic temperature compensation system for an APD array chip. The bias voltage full-automatic temperature compensation system comprises the APD array chip (101), a thermistor (108), an AD converter I (107), a matching resistor (110), an AD converter II (105), a microprocessor (102), a digital potentiometer (103), an output-adjustable high-voltage module (104), a buzzer (109) and a display module (106). The bias voltage full-automatic temperature compensation system has the advantages that the working temperature of the APD array chip can be obtained by detecting the resistance of the thermistor so as to obtain the needed optimal reverse bias voltage, then the digital potentiometer is used to change the output voltage of the output-adjustable high-voltage module to allow the APD array chip to obtain the reverse bias voltage matched with the current working temperature, and a reverse bias voltage full-automatic temperature compensation function of the APD array chip is achieved.

Description

technical field [0001] The invention relates to an APD bias voltage regulation technology, in particular to an APD array bias high-voltage automatic temperature compensation system. Background technique [0002] When an APD (avalanche photodiode) under reverse high voltage bias is irradiated with light, the current flowing through the APD will produce an avalanche multiplication effect. The closer the APD reverse bias voltage is to the avalanche breakdown voltage, the more significant the avalanche multiplication effect will be, but at the same time, additional noise effects will be generated that will overwhelm the useless signal. Therefore, precise control of the APD reverse bias voltage has become the biggest problem in the practical application of APD. Since the avalanche breakdown voltage changes with temperature, it is necessary to control the APD bias high voltage to also follow the temperature change. [0003] "Optical Communication Technology" Journal 12, 2014 "Des...

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Problems solved by technology

[0003] "Optical Communication Technology" Journal 12, 2014 "Design of APD Bias Temperature Compensation Circuit Based on ADL5317 and LM35"; "Circuit Design", both disclose the design of the APD bias temperature compensation circuit. The disadvantages are: it is necessary to manually adjust the parameters of multiple components in the circuit, the voltage range of the high voltage module is small, and the adjustment is inconvenient

"Optics and Optoelectronics Technology", Issue 4, 2013, "APD Numerical Control Bias Circuit with Temperature Compensation"; "Industrial Control Computer", Volume 25, No. 3, 2012, "Design of Numerical Control Bias Source for Avalanche Photodiode Based on DSP" , their shortcomings are: although a microcontroller is used, some components of the high-voltage module still need to be adjusted manually; and the temperature measurement circuit is more complicated

[0004] None of the existing temperature compensation methods are aimed at APD array chips, they are all limited to a single APD, and some circuit parameters need to be adjusted manually, and automatic temperature compensation has not been realized.

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