Laser Journal, Volume. 45, Issue 11, 16(2024)

Balanced multistage low-noise amplifier for measuring backscattered light

MA Chao1...2, ZHOU Wan3, LIU Bin4, GAO Song2 and CHEN Chaobo2 |Show fewer author(s)
Author Affiliations
  • 1School of Mechatronic Engineering, Xi’an Technological University, Xi’an 710021, China
  • 2School of Electronic Information Engineering, Xi’an Technological University, Xi’an 710021, China
  • 3Xianyang Vocational&Technical College, Xianyang Shaanxi 712000, China
  • 4Xi’an KEYWAY Technology Co. Xi’an 710077, China
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    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 low-noise 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.

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    MA Chao, ZHOU Wan, LIU Bin, GAO Song, CHEN Chaobo. Balanced multistage low-noise amplifier for measuring backscattered light[J]. Laser Journal, 2024, 45(11): 16

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    Paper Information

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    Received: Apr. 22, 2024

    Accepted: Jan. 17, 2025

    Published Online: Jan. 17, 2025

    The Author Email:

    DOI:10.14016/j.cnki.jgzz.2024.11.016

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