一种低附加相位噪声的频率合成方法  

A kind of frequency synthesis with low additional phase noise

作　　者：邹海明 高伟 刘文冬 罗俊 王晶阳 ZOU Haiming;GAO Wei;LIU Wendong;LUO Jun;WANG Jingyang(Zhuhai Microcreative Tech.Co.,Ltd.,Zhuhai Guangdong 519000,China)

机构地区：[1]珠海微度芯创科技有限责任公司,广东珠海519000

出　　处：《太赫兹科学与电子信息学报》2024年第5期529-536,共8页Journal of Terahertz Science and Electronic Information Technology

摘　　要：频率源的相位噪声水平直接制约雷达的性能上限,因而低相噪频率合成技术是高性能雷达系统的一项关键技术。现有低相噪频率合成方法常用高次倍频实现,整体性能上严重依赖于低相噪晶振,成本一直居高不下。对此,提出一种低附加相位噪声频率合成方法,即采用最小化链路上附加相位噪声的技术,用普通恒温晶振级联低相噪放大器、梳状谱发生器和锁相环,最终实现低相位噪声的频率合成。实测数据表明,本文方法以100 MHz普通恒温晶振为参考,积分区间[1 kHz,30 MHz]的时间抖动为11 fs,频率合成在5.8 GHz载波的相位噪声为-119 dBc/Hz@1 kHz,积分区间[1 kHz,30 MHz]的时间抖动为13.7 fs,总附加时间抖动为8.17 fs,附加相位噪声仅1.9 dB,达到了业界领先水平,能够有效提升毫米波雷达系统的成像性能,优于传统频率合成方法。The phase noise level of the frequency source directly restricts the upper limit of radar performance,thus low phase noise frequency synthesis is a key technology for high performance radar systems.Existing low phase noise frequency synthesis methods are often realized by high order frequency doubling,and the overall performance is heavily dependent on the low phase noise Oven Controlled Crystal Oscillator(OCXO),therefore the cost is high.In this paper,a low additional phase noise frequency synthesis method is proposed,the technique of minimizing the additional phase noise on the link is adopted,and an ordinary OCXO is employed to cascade the low phase-noise amplifier,comb generator,and phase-locked loop to ultimately realize the frequency synthesis with low phase noise.The measured data show that the proposed method uses a 100 MHz OCXO as a reference,the time jitter in the integration interval[1 kHz,30 MHz]is 11 fs,the phase noise of the frequency synthesized at the 5.8 GHz carrier is-119 dBc/Hz@1 kHz,the time jitter in the integration interval[1 kHz,30 MHz]is 13.7 fs,the total additional time jitter is 8.17 fs,and the additional phase noise is only 1.9 dB.It reaches the industry-leading level,which can effectively improve the imaging performance of millimeter-wave radar systems and outperforms the traditional frequency synthesis methods.

关 键 词：梳状谱 附加相位噪声 时间抖动 锁相环 频率合成 

分 类 号：TN74[电子电信—电路与系统]