北京大学学报（自然科学版） ›› 2026, Vol. 62 ›› Issue (2): 230-236.DOI: 10.13209/j.0479-8023.2026.003

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基于源极跟随器的专用集成前置放大器量程扩展研究

王游龙, 于向前†, 王玲华, 陈鸿飞, 施伟红, 叶雨光, 王永福, 杨芯, 宗秋刚, 邹鸿   

  1. 北京大学地球与空间科学学院, 北京 100871
  • 收稿日期:2025-02-27 修回日期:2025-10-20 出版日期:2026-03-20 发布日期:2026-03-20
  • 基金资助:
    国家重大科研仪器研制项目(42127803)和国家自然科学基金杰出青年基金(42225404)资助

Range Expansion for Specific Integrated Preamplifier Based on Source Follower

WANG Youlong, YU Xiangqian, WANG LingHua, CHEN Hongfei, SHI Weihong, YE Yuguang, WANG Yongfu, YANG Xin, ZONG Qiugang, ZOU Hong
  

  1. School of Earth and Space Sciences, Peking University, Beijing 100871
  • Received:2025-02-27 Revised:2025-10-20 Online:2026-03-20 Published:2026-03-20

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摘要：

针对专用集成前置放大器RENA3的最大输入电荷量限制量程且最佳输入电容(2或9 pF)过低, 导致无法匹配较大的粒子探测器等效电容(几十到几百pF)的问题, 提出将源极跟随器作为RENA3的输入级, 解决最大输入电荷量和最佳输入电容受限问题, 从而扩展应用范围。对所提方法进行理论分析、PSpice仿真以及实验验证, 实验结果与理论分析和数值模拟结果吻合, 由此验证所提方法的可行性。该方法同样适用于其他类型的专用集成前置放大器。

关键词: 电荷灵敏放大器, 量程扩展, 电容匹配, RENA3

Abstract:

To address the problems that the maximum input charge of the application-specific integrated preamplifier RENA3 limits its measurement range and its optimal input capacitance (2 pF or 9 pF) is too low to match the large equivalent capacitance of particle detectors (tens to hundreds of picofarads), a source follower is proposed as the input stage of RENA3 to overcome the constraints on maximum input charge and optimal input capacitance, thereby expanding its application scope. The proposed method is verified via theoretical analysis, PSpice simulation, and experiments. The experimental results are consistent with the theoretical analysis and numerical simulation, which validates the feasibility of the proposed method.

Key words: charge sensitive preamplifier, range expansion technology, capacitance matching, RENA3

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