基于二维延迟链的高精度时间间隔测量

High accuracy time interval measurement based on two-dimensional delay chains

延迟线内插法是一种常用的时间间隔高精度测量方法,具有结构简单、便于片上实现的特点。本文提出了一种基于二维延迟链的高精度时间间隔测量方法,解决了现有一维延迟链中测量精度与刻度均匀性的矛盾;对二维延迟链的时间间隔测量精度进行了分析,通过QuartusⅡ软件对二维延迟链进行了布线,并由时序仿真得到了100ps的测量精度。

The method of delay chain interpolation is commonly applied in high accuracy time interval measurement, which has the advantages of simplicity and is easy for on chip implementation. The paper introduces a high accuracy time interval measurement method based on two-dimensional delay chains, which solves the conflict in temporary on dimensional delay chain between measurement accuracy and scale equality. After analyzing the time interval measurement accuracy of the two-dimensional delay chains, the routing is implemented by utilizing the software Quartus Ⅱ. The measurement accuracy results of timing simulation achieved to 100ps.