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基于FPGA的多次测量型高精度TDC电路设计

Design of a High-precision Multi-measurement TDC Circuit Based on FPGA

  • 摘要: 飞行时间(TOF)探测器是大型核物理和粒子物理实验中的关键组件,基于TOF探测器的许多实验将在兰州重离子研究装置(HIRFL)和强流重离子加速器装置(HIAF)上进行。用于测量精密时间间隔的时间-数字转换器(TDC)在TOF探测器上发挥着极其重要的作用。基于现场可编程门阵列(FPGA)平台,设计并实现了三种不同架构的TDC:多链同时测量型、多沿同时测量型以及多周期重复测量型。对比三种TDC的时间分辨率与测量精度,并给出各自的优缺点。实验测试结果表明,三种TDC均有优异的分辨率和精度,平均bin width达到了6 ps,时间测量精度的均方根值(RMS)小于10 ps。

     

    Abstract: The Time-of-Flight (TOF) detector is a critical component in large-scale nuclear and particle physics experiments. Many TOF-based experiments will be conducted at the Heavy Ion Research Facility in Lanzhou (HIRFL) and the High-Intensity Heavy-Ion Accelerator Facility (HIAF). The Time-to-Digital Converter (TDC), which measures precise time intervals, plays an essential role in TOF detectors. This paper presents the design and implementation of three different multi-measurement TDC architectures based on Field-Programmable Gate Arrays (FPGA): a multi-chain simultaneous measurement TDC, a multi-edge simultaneous measurement TDC, and a multi-cycle repetitive measurement TDC. The time resolution and precision of the three TDCs are compared, and their respective advantages and disadvantages are discussed. Experimental results demonstrate that all three TDCs exhibit excellent resolution and accuracy, with an average bin width of 6 ps and a root mean square (RMS) time measurement accuracy better than 10 ps.

     

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