摘要
针对激光陀螺谐振腔背向散射光测量中的背向散射光模式信号获取需要特定频段的低噪声放大器问题,提出了一种平衡式多级低噪声放大器。该低噪声放大器采用平衡式多级级联结构,设计专用正交耦合器以实现与光电器件的共轭匹配,基于负反馈方式进行稳定性调整,对偏置电路进行了噪声优化,基于噪声和增益选择阻抗点,从功率流传输的角度分析并对正交耦合器结构做出创新。最终达到了“阻抗匹配,噪声最小”的设计目标。验证表明,在2.3 GHz~2.7 GHz增益可达20 dB,增益平坦度约为3 dB,整体输入驻波比小于1.50,对光电探测器输出噪声有明显的抑制效果。设计结果可参考应用在高频光电器件信号放大、混频器设计和TR组件等场景,解决普通单支路低噪声放大器增益较低和噪声较大的问题。
A balanced multistage low-noise amplifier is proposed to address the problem that the acquisition of backscattered light mode signals in the backscattered light measurement of laser gyro resonance cavities requires lownoise amplifiers in specific frequency bands.The low-noise amplifier adopts a balanced multistage cascade structure,designs a special orthogonal coupler to achieve conjugate matching,adjusts stability based on negative feedback,optimizes noise for the bias circuit,selects impedance points based on noise and gain,and analyzes and innovates the structure of the orthogonal coupler from the perspective of power flow transmission.The design goal of"impedance matching and noise minimization"is finally achieved.Verification shows that the gain is up to 20dB at 2.3 GHz~2.7 GHz,the gain flatness is about 3dB,the overall input VSWR is less than 1.50,and the output noise of the photodetector is obviously suppressed.The design results can be referenced and applied to many scenarios such as signal amplification of high-frequency optoelectronic devices,mixer design,and TR components to solve the problem of low gain and high noise of single-branch low-noise amplifiers.
作者
马超
周晚
刘斌
高嵩
陈超波
MA Chao;ZHOU Wan;LIU Bin;GAO Song;CHEN Chaobo(School of Mechatronic Engineering,Xi’an Technological University,Xi’an 710021,China;Xianyang Vocational&Technical College,Xianyang Shaanxi 712000,China;Xi’an KEYWAY Technology Co.Xi’an 710077,China;School of Electronic Information Engineering,Xi’an Technological University,Xi’an 710021,China)
出处
《激光杂志》
CAS
北大核心
2024年第11期16-24,共9页
Laser Journal
基金
国家重点研发计划项目(No.2022YFE0123400)
陕西省科技厅重点研发项目(No.2022GY-112)。
关键词
阻抗匹配
功率流传输
正交耦合器
Impedance mismatch
Power flow transmission
Quadrature coupler
作者简介
马超(1985-),男,讲师,主要研究方向:计算机测控技术、智能化仪表。E-mail:machao@xatu.edu.cn。
