Research Of Short Time Interyal Generating Technology Based On FPGA

Timing generation has been widely used in the time interval measuring instrumentcalibration, ultra-wideband radar signal generation physics experiments, timing control.With the technology development in these areas, the time interval to produce thetechnology had put forward higher requirements.In this paper, on the basis of various the timing generation methods, a dual-delaylink to a new way to produce short interval. Dual-delay chain arranged in parallel by thetwo N programmable delay unit concatenation of two programmable delay unit controlmodule respectively, with the two clock signals with frequencies close to the calibrationof the reference clock, the use of two programmable delay unit a delay difference toimprove system resolution. Programmable delay dual delay chain unit, the size of analgorithm is used to configure the programmable delay cell delay, the resolution underthe premise of the guarantee system, taking into account the dynamic range of thesystem.Most of the short interval generating system using ASIC implementations, but thismethod of system design and development cycle, specific and strong, highmanufacturing costs short comings. This article through the in-depth study of the delayunit and the layout of the wiring inside the FPGA, combined with dual delay chain in ashort time interval to generate system implemented on FPGA, that the system FPGAprogram can be modified according to different application environments, and to ensurethat high-resolution shorten the system development time, reduce design andmanufacturing costs. Sub-module design idea, divided by function as a reference clockgeneration module the dual delay chain module, data processing module, timing controlmodules, and each module is completed the detailed design and implementationprocess.Finally, in order to verify the actual performance of the system, this article on shortinterval self-developed hardware board carried out a large number of tests, the resultsshow that: the system interval resolution of9ps, differential nonlinearity and integralnonlinearity is-0.3LSB~0.35LSB、-0.73LSB~0.93LSB, to achieve the system designrequirements. Short time interval FPGA-based generation system has the advantages ofhigh resolution, low cost, low complexity, easy to expand, to the field in a short time interval produce good research value.