摘要
接收前端是雷达、通信系统的重要组成部分,动态范围决定了系统在不同信号强度下能否正确接收和处理信号。针对现有接收前端瞬时动态范围扩展响应时间长、扩展能力有限的难题,提出了一种可配置门限的快速自适应动态扩展接收前端。该前端能够在基本不影响系统灵敏度情况下,通过射频检波及运放电路实现射频链路的快速增益调整。通过在商业仿真软件中选用合适器件建立微波电路、检波电路及运放电路,实现了该前端组件的仿真与设计。最终进行了加工测试,实测与仿真一致性较好。实测表明:提出的接收前端在LSC波段噪声系数优于4.2 dB,并实现了响应速度为100 ns的25 dB瞬时动态范围扩展,具备门限可配置功能,可以满足高灵敏度和大动态范围扩展的系统应用需求。
The receiving front end is an important component of radar and communication systems.As one of its key performance indicators,the dynamic range determines whether the system can correctly receive and process signals under different signal strength.Aiming at the challenges of long response time for instantaneous dynamic range expansion and limited expansion range ability in existing receive front-end,a fast self-adaptive dynamically-expandable receive front-end with a confi gurable threshold is proposed.This architecture enables rapid gain adjustment in the RF chain through RF detection and operational amplifi cation circuit,while maintaining system sensitivity.The proposed framework employs commercial simulation software to construct microwave-circuit,detector-circuit and operational amplifi cation circuit by selecting suitable device models,facilitating co-simulation and design optimization of the receive front-end.Finally,the physical test is carried out,and the measured results are in good agreement with the simulation.They show that the receive front-end proposed achieves a 25 dB instantaneous dynamic range expansion with 4.2 dB noise fi gure in LSC band within 100 ns.At the same time,this front-end has threshold confi gurable function,which can meet the requirements of high sensitivity and large dynamic range expansion.
作者
王欢
罗秋艳
林宏声
米添
张涛
WANG Huan;LUO Qiuyan;LIN Hongsheng;MI Tian;ZHANG Tao(Mailbox 429,Chadianzi,Chengdu 610036,China)
出处
《电子工艺技术》
2025年第5期10-13,共4页
Electronics Process Technology
关键词
射频
接收前端
自适应
瞬时动态范围
radio frequency
receive front-end
self-adaptive
instantaneous dynamic range(IDR)
