基于FPGA的高分辨率数字时间转换器  

High resolution digital-to-time converter based on FPGA

作　　者：王伟 张瑞峰 Wang Wei;Zhang Ruifeng(School of Microelectronics,Tianjin University,Tianjin 300072,China)

机构地区：[1]天津大学微电子学院,天津300072

出　　处：《强激光与粒子束》2023年第3期155-163,共9页High Power Laser and Particle Beams

摘　　要：针对全固态直线变压器驱动源(LTD)中大规模开关同步触发的需求,基于游标法和预相移技术设计了一种全新的双通道同步高分辨率数字时间转换器(DTC)。在原有游标DTC的基础上提前计算不同生成脉冲相位重合位置的关系,通过相位移动和相位检测使时钟信号提前满足相位关系,以实现同时触发多个不同宽度脉冲信号的目的。详细阐述了DTC的实现原理和电路设计模块,并对其进行了仿真和现场可编程门阵列(FPGA)实现,同时对实现结果进行测试、分析和讨论。在Xilinx ARTIX-7 FPGA开发板上实现了第一个脉冲信号的分辨率为0.85 ps,微分非线性(DNL)和积分非线性(INL)分别为-1.255~1.166 LSB和-7.33~7.05 LSB。第二个脉冲信号分辨率为17.1131 ps,DNL和INL分别为-0.0987~0.105 LSB和-0.717~0.735 LSB,且在0~80℃的环境温度中依旧可以保证DTC的性能。结果表明此DTC具有实现简单、成本低,性能高效等优点。Aiming at the requirement of large-scale switch synchronous triggering in all-solid-state linear transformer driver(LTD),this paper designs a new dual-channel synchronous high-resolution digital-to-time converter(DTC)based on the vernier method and pre-phase shift technology.On the basis of the original vernier DTC,the relationship between the overlapping positions of different generated pulse phases is calculated in advance,and the clock signal meets the phase relationship in advance through phase shift and phase detection,so as to achieve the purpose of triggering multiple pulse signals of different widths at the same time.The realization principle and circuit design module of DTC are expounded in detail,and the simulation and Field Programmable Gate Array(FPGA)realization are carried out.At the same time,the realization result is tested,analyzed and discussed.On the Xilinx ARTIX-7 FPGA development board,the resolution of the first pulse signal is 0.85 ps,and the differential nonlinearity(DNL)and integral nonlinearity(INL)are-2.55~2.17 LSB and-7.33~7.05 LSB,respectively.The resolution of the second pulse signal is 17.1131 ps,DNL and INL are-0.005~0.0105 LSB and-0.299~0.288 LSB respectively,and the performance of DTC can still be guaranteed in the ambient temperature of 0~80℃.The results show that this DTC has the advantages of simple implementation,low cost and high performance.

关 键 词：数字时间转换器 游标法 预相移 模式时钟管理器 同步触发 

分 类 号：TN492[电子电信—微电子学与固体电子学]