数字射频存储系统中高速DAC电路的设计与实现

发布时间：2018-04-29 17:53

本文选题：数字射频存储 + 数模转换　；参考：《燕山大学》2016年硕士论文

【摘要】：随着电子对抗技术的不断发展,高速数字射频存储技术逐渐被人们运用到雷达系统中。数字射频存储系统通过对射频信号的采集、存储、变换重构,来实现对信号目标的模拟、回放、干扰等。近年来,随着高速集成电路的不断发展,雷达系统的发展也得到了进一步的提高。然而,数字射频存储系统的带宽和转换速率都限制了雷达系统的发展。针对以上问题,本文在数字射频存储系统中运用高速数模转换电路,从而使得系统在速度和带宽方面取得突破性进展。首先,本文根据系统提出的各项技术指标,对芯片进行选型。同时,对系统内的现场可编程门阵列(Field Programmable Gate Array,FPGA)模块、数据转换模块、时钟模块、电源管理模块、电平转换模块进行详细设计及可行性分析。基于原理图的设计进行PCB绘制。针对高速DAC模块及数字射频存储系统的特点,提出了绘制PCB过程中需要注意的一系列问题,包括叠层、信号完整性、电源完整性、布局布线等几方面。绘制完成后,进行电路板的制作。其次,对数字射频存储系统进行逻辑设计。实现的主要功能是通过直接数字频率合成技术在FPGA内部产生频率可控的数字信号,对数字信号产生模块进行时域和频域的仿真。对系统数据的逻辑转换进行设计,通过FPGA内的并串转换将数据进行升速处理,为系统提供数字信号。对数字射频存储系统的时钟逻辑进行设计及仿真。最后,对系统进行上板调试。对系统的窗口、无杂散动态范围、平坦度等重要参数进行了测试。通过测试结果可以看出系统的设计完成了预定目标,实现了高速数字射频存储系统中DA模块8GSPS转换速率,4GHz带宽,30dBc以上的无杂散动态范围,各项技术指标性能良好。
[Abstract]:With the continuous development of electronic countermeasures technology, high speed digital radio frequency storage technology is gradually applied to radar system. Digital radio frequency storage system is used to collect, store, transform and reconstruct radio frequency signal to realize signal target simulation, playback, interference and so on. In recent years, with the continuous development of high speed integrated circuit, radar system However, the bandwidth and conversion rate of the digital radio frequency storage system restrict the development of the radar system. In this paper, the high-speed digital analog conversion circuit is used in the digital radio frequency storage system, which makes the system achieve breakthrough in speed and band width. At the same time, the detailed design and feasibility analysis of the field programmable gate array (Field Programmable Gate Array, FPGA) module, the data conversion module, the clock module, the power management module, the level conversion module, and the PCB drawing based on the design of the schematic diagram. The characteristics of high speed DAC module and digital radio frequency storage system, a series of problems should be paid attention to in the process of drawing PCB, including stack, signal integrity, power integrity, layout and wiring. After drawing and completion, the circuit board is made. Secondly, the logic design of the digital radio frequency storage system is made. The main functions of the realization are the main functions of the system. Using direct digital frequency synthesis technology to generate frequency controlled digital signals within FPGA, the digital signal generation module is simulated in the time domain and frequency domain. The logic conversion of the system data is designed, the data is processed by the parallel serial conversion in FPGA, and the digital signal is provided for the system. The clock logic is designed and simulated. Finally, the system is debugged on board. The system window, no stray dynamic range, flatness and other important parameters are tested. Through the test results, it can be seen that the system design completed the predetermined target, and realized the DA module 8GSPS conversion rate, 4GHz bandwidth, 30d in the high speed digital radio frequency storage system. The Bc has no spurious dynamic range, and the technical indexes are in good performance.

【学位授予单位】：燕山大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：TN952

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