Scholarlink

<p> For photoelectric conversion applications with high gain, wide bandwidth and stringent passband flatness requirements, the bandwidth limitation and frequency response peaking due to the parasitic capacitance of photodiodes are investigated in this paper. Firstly, the closed-loop transfer function model of transimpedance amplifier is established based on the unipolar system, and the root trajectory characteristics under different combinations of gain bandwidth product and feedback capacitance parameters are analyzed through numerical simulation. The simulation results show that the influence of parasitic capacitance can be effectively suppressed by optimizing the parameter configuration. Secondly, the reasonable value range of the feedback capacitance is theoretically deduced by establishing an open-loop transfer function model. Finally, the circuit simulation results based on several commercial chips verify the correctness of the theoretical analysis. This study provides a parameter optimization basis for the design of transimpedance amplifiers for high-precision photodetection systems.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Bandwidth Expansion of High-Gain Passband Flat Transimpedance Amplifiers

  • 期刊论文

  • 发表日期：

    2026年2月4日

查看全文
  • Qiuye Mu,
  • Bingfeng Sun,
  • Zhenfang Fan,
  • Bowen Li,
  • Min Ye

摘要

For photoelectric conversion applications with high gain, wide bandwidth and stringent passband flatness requirements, the bandwidth limitation and frequency response peaking due to the parasitic capacitance of photodiodes are investigated in this paper. Firstly, the closed-loop transfer function model of transimpedance amplifier is established based on the unipolar system, and the root trajectory characteristics under different combinations of gain bandwidth product and feedback capacitance parameters are analyzed through numerical simulation. The simulation results show that the influence of parasitic capacitance can be effectively suppressed by optimizing the parameter configuration. Secondly, the reasonable value range of the feedback capacitance is theoretically deduced by establishing an open-loop transfer function model. Finally, the circuit simulation results based on several commercial chips verify the correctness of the theoretical analysis. This study provides a parameter optimization basis for the design of transimpedance amplifiers for high-precision photodetection systems.