中圖分類號： TN79 文獻標識碼： A DOI：10.16157/j.issn.0258-7998.222793 中文引用格式： 劉琛昊，金革. 皮秒級多脈沖時間間隔大量程時間測量系統(tǒng)設計[J].電子技術應用，2022，48(10)：108-112. 英文引用格式： Liu Chenhao，Jin Ge. A large range time measuring system study of picosecond multi-pulse time interval[J]. Application of Electronic Technique，2022，48(10)：108-112.
A large range time measuring system study of picosecond multi-pulse time interval
Liu Chenhao1，Jin Ge2
1.School of Microelectronics，University of Science and Technology of China，Hefei 230026，China； 2.Department of Modern Physics, School of Physical Sciences，University of Science and Technology of China，Hefei 230026，China
Abstract： Time measurement technology has important applications in laser ranging, particle identification, radioactive nuclear medicine engineering and other fields. This design uses the time interpolation technology based on FPGA EP3C55F484C6 which produced by Altera Corp to achieve high precision TDC. By combining with the upper computer, the number of stop pulses corresponding to a start pulse can be adjusted in a single measurement, which can solve the problem of repeated measurement when there are multiple targets to be measured in a measurement. After the test, the design resolution is 90.08 ps, the measurement accuracy is 33.54 ps, the integral nonlinear INL range is(-0.34 LSB~+0.27 LSB), and the differential nonlinear DNL range is(-0.28 LSB~+0.31 LSB).
Key words : time-to-digital converter；FPGA；multi-pulse measuring；carry chain
0 引言
科學實驗中許多信息是以時間信息方式存在于探測器的輸出信號中，典型的例子如飛行時間測量(Time of Flight，TOF)：發(fā)射端發(fā)射信號到待測物體后，被反射回探測器，通過對往返時間間隔進行分析，可以得到距離信息，而所測得時間精度也就決定了TOF系統(tǒng)的精度[1]。而時間數(shù)字轉(zhuǎn)換器則是在時間分析中使用較多的測量手段[1-2]。在傳統(tǒng)的實驗中，若存在多個待測物體，探測器會收到多個信號，需進行多次測量，增加實驗的復雜度，且無形中增加實驗成本。針對這一情況，本文設計了在一次測試中，一個“開始”信號可以對應多個“停止”信號進行測量的時間數(shù)字轉(zhuǎn)換系統(tǒng)。
