微弱信号检测的超低噪音宽带放大器设计
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摘要
本文简要报道了微型超低噪音宽带快电荷灵敏前置放大器。该放大器主要采用高增益宽带低噪音电压反馈型集成运放芯片OPA847,其低电压输入噪音低至0.85n V/Hz1/2,带宽高至3.9GHz。整个成本低至数百元,是同类型产品的1/10或更少,该前置放大器具有电路结构简单、紧凑,超高速,极低噪音,超高稳定性等优点。经实验测试,该放大器能有效进行微弱信号的放大和噪音的抑制,可广泛应用于普通物理实验的光电探测的前置放大,科研上也具有较可观的应用前景。
A miniature, ultra-low-noise, and high-sensitivity preamplifier has been introduced in brief in this paper. The design is adopted which mainly combines a high-gain bandwidth, low-noise, voltage-feedback operational amplifier OPA847. The input voltage noise density reaches to as low as 0.85 n V/Hz1/2 and bandwidth gets up to 3.9 GHz. The device costs only several hundred yuan, which is less than one tenth of cost for similar products. The preamplifier has the advantage of simple, compact, super-high speed, ultra-low noise and super-high stability et al. The amplifier has the function of the gain of weak signal and suppression of noise after testing. It is applied to the amplification of photoelectric detection and has the application foreground for scientific research.
A miniature, ultra-low-noise, and high-sensitivity preamplifier has been introduced in brief in this paper. The design is adopted which mainly combines a high-gain bandwidth, low-noise, voltage-feedback operational amplifier OPA847. The input voltage noise density reaches to as low as 0.85 n V/Hz1/2 and bandwidth gets up to 3.9 GHz. The device costs only several hundred yuan, which is less than one tenth of cost for similar products. The preamplifier has the advantage of simple, compact, super-high speed, ultra-low noise and super-high stability et al. The amplifier has the function of the gain of weak signal and suppression of noise after testing. It is applied to the amplification of photoelectric detection and has the application foreground for scientific research.
引文
[1]胡涛,司汉英.光电探测器前置放大电路设计与研究[J].光电技术应用,2010,25(1):52-55.
[2]扬芃原,杭纬,周振,苏永选.用于飞行时间质谱检测的小信号宽带放大器[J].分析测试仪器通讯,1995,4:187-189.
[3]张子斌,翟利华.用于激光电离质谱的低噪声脉冲放大器[J].质谱学报,2000,21(1):56-60.
[4]古良玲,杨奕.电路电子基础实验中Multisim10.0的应用技巧[J].实验科学与技术,2010,8(1):45-47.
[5]张丽萍.Multisim10.0仿真软件在模拟电路实验中的应用[J].实验科学与技术,2009,7(6):61-62.
[6]李军雨,吴晗平,吕照顺,梁宝雯,李旭辉.基于FPGA的紫外通信微弱信号放大器设计[J].激光与红外,2014(10):1143-1148.
[2]扬芃原,杭纬,周振,苏永选.用于飞行时间质谱检测的小信号宽带放大器[J].分析测试仪器通讯,1995,4:187-189.
[3]张子斌,翟利华.用于激光电离质谱的低噪声脉冲放大器[J].质谱学报,2000,21(1):56-60.
[4]古良玲,杨奕.电路电子基础实验中Multisim10.0的应用技巧[J].实验科学与技术,2010,8(1):45-47.
[5]张丽萍.Multisim10.0仿真软件在模拟电路实验中的应用[J].实验科学与技术,2009,7(6):61-62.
[6]李军雨,吴晗平,吕照顺,梁宝雯,李旭辉.基于FPGA的紫外通信微弱信号放大器设计[J].激光与红外,2014(10):1143-1148.