文献类型：期刊文献

中文题名：微弱荧光信号检测放大器的低噪声设计

英文题名：The Low Noise Circuit's Design of the Weak Fluorescent Signal Detector

作者：王慧锋[1];陈晞[2];张芹[3]

机构：[1]华东理工大学信息科学与工程学院自动化系,上海200237;[2]上海精密科学仪器有限公司,上海200030;[3]上海三科仪器有限公司,上海200030

年份：2007

卷号：5

期号：4

起止页码：46

中文期刊名：生命科学仪器

外文期刊名：Life Science Instruments

收录：CSTPCD

语种：中文

中文关键词：微弱信号;荧光信号;低噪声;光电二极管

外文关键词：Weak signal; Fluorescent signal; Low noise; Photodiode

摘要：本文对采用光电二极管的荧光信号接收电路的工作模式和噪声进行了分析。并论述了输入失调和暗电流的补偿方法,深入讨论了反馈电阻RF及补偿电容CF的防泄漏措施、输入管脚的“护卫(guarding)”与隔离技术、输入管脚的悬置引出技术、PCB板的清洁和隔离涂敷、屏蔽和滤波等技术。使所设计的接收电路获得较高的信噪比(SNR)。
This paper analyzed the working mode and noise causation in fluorescent signals detecting circuits by using photodiode. The compensating techniques of input offset and diode＇ s dark current are discussed. The methods for holding back leakage on the feedback resistor RF and compensating capacitance CF, the techniques for guarding and insulating input pin, the technique for input pin suspending connecting, cleaning and insulating coating of PCB board, the techniques for shielding and filtering are researched in detail. The designed detecting circuit＇ s SNR is increased.