基于单片机多模式控制的APD偏压电路模块设计

Design of APD Bias Circuit Module Based on Multi-mode Control of Single Chip Microcomputer

摘要:

针对雪崩光电二极管(APD)应用多样化的需求,提出多模式控制的APD偏压电路模块设计方案。基于APD工作原理,分析了APD增益系数、反向偏置电压、工作温度三者之间的关系,设计了具有多模式工作的APD偏压模块硬件电路,开展了详细的单片机软件功能设计。结合雪崩光电二极管进行了实验验证,结果表明在-40~+60℃温度范围内,该偏压电路模块具有温度补偿及多模式切换功能,输出电压偏差小于0.5V,纹波小于100mV,可实现APD多模式工作,满足工程化应用需要。

Abstract:

In response to the diverse applications of avalanche photo-diode (APD), a design solution of bias circuit module with multi-mode control was proposed. Based on the working principles of APD, the correlation among gain coefficient, reverse bias voltage and operating temperature was analyzed. The bias circuit modules with multi-mode control were designed, the software design was realized on the single chip microcomputer, and the module was analyzed and verified by experiments. Experimental results show that the bias circuit module with multi-mode control and temperature compensation is available in the temperature range of -40~+60℃, the deviation of the output voltage is less than 0.5V, and the ripple is less than 100mV. The module can realize APD multi-mode operation and meet engineering applications.