Generation technology of synchronous trigger signals with low time jitter and high delay resolution
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摘要: 针对大型激光装置中广空间分布的甚多路高精度（一是长时间时间抖动小于5 ps，二是时间延迟微步进分辨率小于15 ps）同步触发信号的需求，设计了一种“数据流编解码光传输+高速串行收发器粗延时+宽带微带线微步进延时”的同步时序产生方案。通过数据流编解码光传输架构实现了广空间范围内时序的对齐；高速串行收发器粗延时和微带线微步进延时技术解决了同步触发信号低时间抖动和高延迟分辨的问题。通过对系统的时序逻辑和电路板的关键线路进行仿真，完成了整个系统的设计与研制，并开展了实验测试。测试结果表明：该系统可以实现广空间范围内的同步时序信号产生，同步触发信号的时间抖动精度优于3.76 ps（均方根值，8 h），39.6 ps（峰峰值，8 h），时间延迟分辨率优于15 ps；若应用于小空间范围，同步触发信号的时间精度可优于1.27 ps（均方根值，8 h），12.4 ps（峰峰值，8 h）。Abstract: Aiming at the requirement of the synchronous trigger signals of large-scale laser device with wide spatial distribution and high-precision (one is that the long-term timing jitter is less than 5 ps, and the other is that the time delay resolution is less than 15 ps), a synchronous timing generation scheme of “data stream codec optical transmission,coarse delay by using transceiver, and fine delay by using broadband microstrip delay line” is designed. The optical transmission architecture of the data stream codec realizes the timing alignment over a wide spatial range, and the technology of the transceiver and microstrip delay line solves the problems of low time jitter and high delay resolution. The design and development of the whole system were completed by simulating the timing logic of the system and the key circuits board, and experimental test were carried out. The test results show that the system can realize the generation of synchronous timing signals in a wide spatial range, and the time jitter accuracy is better than 3.76 ps (rms, 8 h ), 39.6ps (peak-to-peak, 8 h), and the time delay resolution is better than 8 ps; If the system is applied to a small spatial range, the time accuracy of the synchronous signal can be better than 1.27 ps (rms, 8 h ), 12.4 ps (peak-to-peak, 8 h).
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图 1 高延时分辨低抖动同步时序信号产生系统框图
Figure 1. Framework of the synchronizing system with high resolution and low jitter
图 2 基准时钟与触发启动信号的编解码过程图
Figure 2. Encoding and decoding of the reference clock and delayed start signal
图 6 Transceiver收发器实现同步信号的粗延时的波形图
Figure 6. Wave of the transceiver implementing the coarse delay of the synchronization signal
图 7 基准时钟与延时起点信息的编解码时序逻辑仿真图
Figure 7. Codec timing logic simulation of the reference clock and delayed start signal
图 8 具备粗延时的同步信号波形数据的产生
Figure 8. Generation of the waveform data for synchronous signals with coarse delay
表 1 延时设置误差测试结果
Table 1. Results of delay setting error
No. delay on the
CH1/nsdelay on the
CH2/nsdelay between the two channels
in the oscilloscope/nstheoretical
value/nserror between the theoretical
value and measured/ps1 1 1 −0.027 −0.027(intrinsic delay) 0 2 1 10 −9.031 −9.027 4 3 1 50 −49.036 −49.027 9 4 1 100 −99.034 −99.027 7 5 1 300 −299.035 −299.027 8 6 1 800 −799.036 −799.027 9 7 1 1000 −990.033 −999.027 6 8 1 2000 −1999.039 −1999.027 12 9 1 5000 −4999.053 −4999.027 26 10 1 10000 −9999.063 −9999.027 36 11 1 20000 −19999.083 −4999.027 56 
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表 2 延时分辨率测试结果
Table 2. Results of delay resolution
No. delay on the
CH1/nsdelay on the
CH2/nsdelay between the two channels
in the oscilloscope/pstheoretical
value/pserror between the theoretical
value and measured/ps1 1 1.00 −27 −27(intrinsic delay) 0 2 1 1.01 −40 −37 3.0 3 1 1.02 −47 −47 0 4 1 1.03 −59 −57 2.0 5 1 1.04 −66.7 −67 −0.3 6 1 1.05 −81.6 −77 4.6 7 1 1.08 −107.8 −107 0.8 8 1 1.10 −127.5 −127 0.5 9 1 1.15 −179.8 −177 2.8 10 1 1.20 −225.7 −227 −1.3 11 1 1.25 −279 −277 2.0 12 1 1.30 −331.5 −327 4.5 13 1 1.31 −341.7 −337 4.7
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