在噪音方面对选定的摄影接收器输入阶段进行比较分析
Krzysztof Achtenberg1, Zbigniew Bielecki1
1Institute of Optoelectronics, Military University of Technology, 2 Kaliskiego Str., 00-908 Warsaw, Poland.
Sensors (Basel, Switzerland)
|March 17, 2025
概括
这项研究分析了半导体辐射探测器输入阶段的噪声. 带有场效应晶体管 (FET) 操作放大器的传 impedance 放大器为辐射检测系统提供更低的噪声.
科学领域:
- * 电气工程 电气工程
- * 应用物理 * 应用物理
- * 仪器仪表和测量 * 仪表仪表和测量 *
背景情况:
- * 半导体辐射探测器依赖信号调节电路以获得最佳性能.
- * 了解光接收器输入阶段的噪声特性对于探测器的灵敏度和准确性至关重要.
- *PIN光二极管在辐射检测中很常见,因此需要优化放大器设计.
研究的目的:
- *详细说明用于辐射检测的光接收器中不同操作放大器输入阶段的噪声特性.
- * 为了比较电压和传 impedance 放大器的噪声性能和带宽.
- * 评估基于双极连接晶体管 (BJT) 和场效应晶体管 (FET) 的输入阶段,用于光二极管集成.
主要方法:
- * 实验性噪声测量是在PIN光二极管 (BPW34) 上进行的.
- * 两个低噪音操作放大器 (AD797A和ADA4625-1) 在电压和传 impedance 放大器配置中进行了测试.
- * 基于BJT和FET的输入阶段的噪声和带宽进行了比较,这些阶段与光电极管直接运行.
主要成果:
- * 运行在光导模式下的跨阻抗放大器通常是辐射检测的首选解决方案.
- *基于FET的操作放大器在高传 impedance 配置中表现出比基于BJT的更低的输出噪声,因为减少了电流噪声.
- * 设计并验证了一种双通道微分传 impedance 放大器辐射探测器.
结论:
- *输入阶段和操作放大器的选择显著影响辐射探测器噪声性能.
- * 超阻抗放大器,特别是基于FET的操作放大器,建议用于低噪音辐射检测应用.
- * 需要仔细考虑偏差和反补偿,以减轻电路容量的噪声.
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