Implementation of weak optical signal detection circuit
-
摘要: 为将微弱光信号有效地转换为电信号以方便后级电路处理，设计了微弱光信号检测电路。电路由光电转换和前置放大两部分组成。光电转换电路采用低输入偏置电流运算放大器AD549实现；前置放大电路使用对称三极管组成的对数比率放大电路实现，并在同等条件下与集成电路LOG100组成的前置放大电路相比较。实际测量表明，该放大电路设计可有效放大低于1nW的微弱输入信号，同时对噪声也有很强的抑制作用，而由LOG100组成的电路对噪声的抑制能力明显衰减。Abstract: In order to convert weak optical signals into electrical signals effectively for post-processing, a weak optical signal detection circuit is designed. The circuit consists of a photoelectric conversion circuit and a preamplifier circuit. The photoelectric conversion circuit was implemented with a low input bias current operational amplifier AD549. The preamplifier circuit was implemented with a logarithmic ratio circuit using symmetric transistors, and was compared with the preamplifier composed of IC LOG100 under the same conditions. Measurement results show that the amplifier circuit can amplify weak input signals lower than 1nW and noise can also be suppressed efficiently, while the circuit composed of LOG100 has a relatively poor performance in noise suppression.
-
Keywords:
- weak optical signal /
- photoelectric detection /
- pre-amp /
- logarithmic circuit
-
-
［1］刘彬,张秋婵.光电检测前置放大电路的设计［J］. 燕山大学学报,2003,23(3):193-196.
LIU Bin, ZHANG Qiu-chan. Designing of pre-amplifier circuit of photodiode monitoring［J］.Journal of Yanshan University, 2003,23(3):193-196. (in Chinese with an English abstract)
［2］龚涵,陈浩宇.微弱光信号检测电路的设计与实现［J］.科技信息:科学·教研,2007(27):85-87.
GONG Han, CHEN Hao-yu. The design and realization of an optic-electric detecting circuit for weak signal［J］. Science & Technology Information, 2007(27):85-87.(in Chinese with an English abstract)
［3］王立刚,张殿元.低噪声光电检测电路的研究与设计［J］.电测与仪表,200,44(500):63-66.
WANG Li-gang，ZHANG Dian-yuan. Research and design of photoelectric detection circuit with low noise［J］. Electrical Measurement & Instrumentation,2007,44(500):63-66.(in Chinese with an English abstract)
［4］王立婷.光电检测电路的设计及实验研究［D］.吉林：吉林大学,2007.
WANG Li-ting. The design and experimental study on the photoelectric detecting circuit［D］. Jinlin: Jilin University ,2007. (in Chinese)
［5］刘建朝.微弱激光功率计研究［D］.河北：河北工业大学,2007.
LIU Jian-chao. Research on the weak laser power meter［D］.Hebei: Hebei University of Technology, 2007. (in Chinese)
［6］Analog Devices Inc.Products AD549 datasheets［EB/OL］. Norwood: Massachusetts,2002［2008］. http:∥www.analog.com／static／importedfiles／datasheets／AD549.pdf.
［7］Texas Instruments Incorporated .BURR-BROWN Corporation Products LOG100 Datasheets［EB／OL］. Dallas:Texas,1995［2005］. http:∥focus.ti.com／lit／ds／sbfs014／sbfs014.pdf.
计量
- 文章访问数: 3271
- HTML全文浏览量: 174
- PDF下载量: 1365
下载:
陕公网安备 61011302001501号 