频谱分析仪8 GHz射频前端设计及实现  

Design and Implementation of 8 GHz RF Front-End of Spectrum Analyzer

作　　者：郭亚楠 杜会文 丁毓恒 赵子正 GUO Yanan;DU Huiwen;DING Yuheng;ZHAO Zizheng(Ceyear Technologies Co.,Ltd.,Qingdao 266555,China)

机构地区：[1]中电科思仪科技股份有限公司,山东青岛266555

出　　处：《电声技术》2022年第5期126-129,133,共5页Audio Engineering

基　　金：青岛市高端研发机构项目“微弱突发宽带电磁信号微波光子快速探测技术”资助(No.21-7-3-9-jch)。

摘　　要：频谱分析仪需对输入信号进行变频,以方便后端信号采集处理模块对信号进行采集处理。目前,频谱分析仪的变频方案一般以4 GHz为界进行分段,对4 GHz以上频段的信号采用YIG滤波器级联本振混频模块的方式进行变频。这种方式在Sub-6 GHz应用场景下大大增加了设备的成本。为此,本文提出一种8 GHz射频接收前端的变频设计方法。该方法可将3 Hz~8 GHz范围内的输入信号变换到相应的中频上,而无需使用YIG滤波器,大大降低了设备的成本及复杂度。对设计的射频接收模块进行了测试,在LTE制式下相邻频道泄漏比(Adjacent Channel Leakage Ratio,ACLR)指标优于-65 dBc,在5G NR下ACLR指标优于-55 dBc,可很好地满足通信测试要求。The spectrum analyzer needs to convert the input signal to facilitate the signal acquisition and processing module at the back end. At present, the frequency conversion scheme of the spectrum analyzer is generally divided by 4 GHz, and the frequency band above 4 GHz adopts YIG filter cascading local oscillator mixing module to carry out frequency conversion. This method greatly increases the cost of equipment in sub-6 GHz application scenarios. In this paper, frequency conversion design method of 8 GHz RF receiver front-end is proposed, which can transform the input signal in the range of 3 Hz ~ 8 GHz to the corresponding intermediate frequency without using YIG filter, which greatly reduces the cost and complexity of equipment. The Adjacent Channel Leakage Ratio(ACLR) index of LTE system is better than -65 dBc, and the ACLR index of 5G NR is better than-55 dBc, which can well meet the requirements of communication testing.

关 键 词：射频接收前端 相邻频道泄漏比(ACLR) 动态范围 

分 类 号：TN74[电子电信—电路与系统]