一种时间-数字转换NIM插件的研制  

Development of a NIM Module for Time-to-digital Conversion

作　　者：林延畅[1] 王小斌[1] 陈少敏[1] 高原宁[1] 姜春华[1] 钱文斌[1] 

机构地区：[1]清华大学工程物理系

出　　处：《核电子学与探测技术》2008年第1期68-71,共4页Nuclear Electronics & Detection Technology

摘　　要：介绍一种实现时间-数字转换（TDC）功能的单插宽NIM插件的研制。该TDC插件主要包括基于CPLD的13Bit双沿触发计数器与相关逻辑控制电路，基于高速比较器的NIM-TTL电平转换电路，基于ARM微处理器的读数与通讯控制电路，以及电源变换电路等单元电路。它有两组输入端口，分别用于接收来自两个输入端或同一输入端上顺次到达的Start和Stop信号。采用50MHz基准时钟时，该插件的有效时间间隔测量范围为0-81.91bts，最小分辨率为10ns。初步参数测试结果，以及在“子寿命测量实验中的应用效果均表明，该TDC插件具有线性度好、电路简洁、可靠性高、功耗低，成本低，而且易于升级等特点。A developed single slot wide NIM module for time-to-digital conversion （TDC） is presented in this paper. This TDC module consists of a CPLD based double edge trigger counter with logic function circuit, a high speed comparator based NIM-to-TTL logic level converter, a processor ARM based data access and communication control unit, and voltage regulators for power supply. There are tow input groups available, separately for accepting start and stop signal between two input ports or iust from the same input port in sequence. With a 50 MHz reference clock, the available input ranges from 0 to 81.91μs, and the resolution can reach 10 ns level. This module was tested in a muon lifetime measurement experirnent, showing good linearity, simple configuration, low power consumption, good reliability, low cost, and easy upgrade as well.

关 键 词：核仪器插件(NIM) 时间擞字转换(TDC) 双沿触发计数器 复杂可编程逻辑器件(CPLD) 高级精简指令集微处理器(ARM) 

分 类 号：TL82[核科学技术—核技术及应用]