The Design And Implementation Of High-speed Time-digital Converter

Time is the existence of material movement and one of the basic attributes. Precision time as scientific research, scientific experiments and engineering aspects of the basic physical parameters for all the dynamics and timing of the process of measurement and quantitative research to provide the essential time-coordinates. Precision time, not only in nuclear physics, particle physics research, Geodynamics Research, studies the theory of relativity, the pulsar cycle research and Dynamics satellite to measure, such as basic research in the field have an important role, but also in areas such as aerospace, deep space Communications, satellite launching and monitoring, geological mapping, navigation, communications, power transmission and scientific measurement, such as applied research, the national economy and national defense construction is also widespread application, and even to It has been an in-depth every aspect of social life, almost nothing less. Precision time measurement is the basic means of precision time-to-digital converter circuit.Precision time-to-digital converter circuit to achieve a variety of methods, the main thesis of this study is based on field programmable logic devices (FPGA) in the string of high-speed conversion and MAX3885 chips as the core device in order to achieve precision time-to-digital converter circuit. FPGA is rich in resources, at present there has been a lot of time based on the realization of FPGA-to-digital converter circuit research. The present research papers in the previous time-to-digital converter circuit based on the use of the FPGA to achieve high-speed time-to-digital converter circuit of a comprehensive study of detail. In addition, details of the realization of the time-to-digital converter circuit test, the last to achieve given the time-to-digital converter circuit test results and analysis.The main content is as follows:1. Research and Analysis for TDC Time - to-digital converter circuit applications, the key parameters of the analysis of comparative analysis of several hours - to-digital converter circuit method to determine the direction of the research topic.2.The system design of the hardware platform Selected by the string and conversion chip MC100EP445, a high-speed clock chip Si5321, programmable logic devices of the Virtex-4 SX35, USB controller chips CY7C68O13 such as a hardware platform, elaborated on the elements of the circuit Design, and PCB design of a few key points were also discussed.3.System software platform designed Software platform from FPGA procedures, USB driver and user interface of the three aspects of the preparation of a detailed description of the TDC data processing in the process of rising edge detection, data accumulation and FPGA and USB data transfer procedures Process.4.System-testing Through a simple and practical test programme contrast, the system eventually proved the correctness and accuracy, good design to achieve the objective of a sound social and economic benefits.