TODT方法使用随时间变化的动态阈值将核脉冲幅度线性地转化为过阈时间宽度，通过时间测量实现高精度核脉冲幅度的数字化。这一新方法由申请者提出，并得到了国家基金资助，现已结题，并取得了重要研究成果。本课题在此基础上提出进一步开展基于TODT思路的核信号获取其它相关方面的深入研究，内容包括信号基线恢复、堆积判弃，和高精度定时的实现方法和实现电路研究，设计原理样机并建立性能评估实验装置。项目目标是在不显著增加电路复杂度的前提下，将上述各方面的实现与幅度数字化有机结合起来，形成完善的基于动态阈值和时间读出技术的核信号获取新方法；继续发挥TODT方法高集成度的优势，能够用FPGA和分离器件实现多通道信号的并行读出和数据获取系统，并为应用领域的专用ASIC设计奠定基础。本课题不仅具有方法学上的研究意义，也是大型粒子物理实验、核辐射成像，以及国土安全监测等方面设计大通道数并行读出和数据获取系统的迫切需要。

Utilizing the time-varying dynamic threshold to linearly transfer the peak amplitude of nuclear pulses into the time-over-dynamic-threshold (TODT), TODT method could realize the nuclear pulse digitization with high performance by measuring the time width. This new method proposed by the applicant and funded by NSFC has now been accomplished with significant results. Based on the work, this project proposes extending the study to other aspects of the nuclear signal data acquisition with the TODT basic idea, which includes the new methods and practical circuits for realizing baseline restoration, pile-up rejection, high resolution timing, and building a prototype to evaluate them by experiments. The target of the project is able to combine all these new methods with the TODT digitizing method together to form a complete new solution for data acquisition （DAQ）based on dynamic threshold and time readout technique without obviously adding the complexity of implementation. This project will promote the advantage of high degree integration of the TODT method, make it possible to build multiple-channel parallel readout and DAQ systems using commercial available circuit components, and lay the foundation for ASIC design to specific applications. This project is not only significant in methodology, but also demanded by the DAQ design of high-channel-count systems for large-scale particle physics experiments, radiation imaging and homeland security monitoring systems.