存储系统中L波段射频直采技术设计与实现
2022年电子技术应用第9期
林文成,董郑宇,李 琼
中国电子科技集团公司第五十二研究所,浙江 杭州310012
摘要:随着军事科技技术的不断发展,存储关键敏感数据的存储系统在军事领域的重要性越来越突显出来。L波段作为重要的数据信号工作频段,已广泛运用在卫星导航、警戒雷达、通信侦察等领域。介绍了一种基于JESD204B的高速串行总线技术、超低抖动时钟方案及最新高速ADC实现L波段射频直采,采样率可达6 GS/s,SFDR(无杂散动态范围)实测可达67 dBFS以上,直采数据通过FPGA内部进行数字下变频后送给存储单元进行数据存储。
中图分类号:TN957
文献标识码:A
DOI:10.16157/j.issn.0258-7998.222939
中文引用格式:林文成,董郑宇,李琼. 存储系统中L波段射频直采技术设计与实现[J].电子技术应用,2022,48(9):22-26,31.
英文引用格式:Lin Wencheng,Dong Zhengyu,Li Qiong. Design and implementation of L-band RF direct acquisition technology in storage system[J]. Application of Electronic Technique,2022,48(9):22-26,31.
文献标识码:A
DOI:10.16157/j.issn.0258-7998.222939
中文引用格式:林文成,董郑宇,李琼. 存储系统中L波段射频直采技术设计与实现[J].电子技术应用,2022,48(9):22-26,31.
英文引用格式:Lin Wencheng,Dong Zhengyu,Li Qiong. Design and implementation of L-band RF direct acquisition technology in storage system[J]. Application of Electronic Technique,2022,48(9):22-26,31.
Design and implementation of L-band RF direct acquisition technology in storage system
Lin Wencheng,Dong Zhengyu,Li Qiong
The 52nd Research Institute of CETC,Hangzhou 310012,China
Abstract:With the continuous development of military science and technology, the storage system for storing key and sensitive data is becoming more and more important in the military field. As an important data signal working band, L-band has been widely used in satellite navigation, warning radar, communication reconnaissance and other fields. This paper introduces a high-speed serial bus technology based on JESD204B, an ultra-low jitter clock scheme and the latest high-speed ADC to realize L-band RF direct acquisition. The sampling rate can reach 6 GS/s, and the measured SFDR can reach more than 67 dBFS,the direct acquisition data is digitally down converted through FPGA and sent to the storage unit for data storage.
Key words :JESD204B;L-band;dynamic range;lowest jitter
0 引言
按标准的雷达频率命名法[1],L波段是指1 000~2 000 MHz的无线电电波波段。按传统实现方式[2],先采用射频模拟下变频模块在模拟端将1 000~2 000 MHz变频到100~1 100 MHz,然后采用低采样率的ADC进行信号的采集。此方法由于采用了大量的包括低噪放、滤波器、衰减器和本振电路等模拟器件[3],考虑到模拟器件本身易受干扰和有源器件容易引入噪声等因素,会大大降低系统的无杂散动态范围(Spurious-Free Dynamic Range,SFDR)值,一般只能做到50~55 dBFS。本文提出了全新的一种真正实现L波段全频段射频直采的设计方案,采用超高采样率(采样率达到6 GS/s)的ADC芯片实现射频直采,不但简化了前端的采样电路,而且使SFDR提高到了65~70 dBFS。
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作者信息:
林文成,董郑宇,李 琼
(中国电子科技集团公司第五十二研究所,浙江 杭州310012)
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