基于射频IP的低相噪频率产生技术

Low phase noise frequency generation technology based on RF IP

摘要:

提出一种新颖的基于射频IP的低相噪频率合成方案。通过梳线发生器产生多个频点，开关滤波器选择频段，利用二次混频进行频谱搬移的方式实现Ka波段的宽带覆盖；采用三维系统级封装(3D-SIP)的集成方式弥补了传统直接频率合成式难以实现小型化的缺点；通过分频器及倍频器实现100 MHz的小步进变化。该方案可实现-99 dBc/Hz@1 kHz的相噪，弥补了直接数字频率合成(DDS)激励锁相环(PLL)小步进频率合成方式难以实现低相噪的缺点。该频率合成器具有小型化、低相噪的优点，具有较强的工程使用价值，可拓展用于多类通信及雷达系统中。

Abstract:

A novel low phase noise frequency synthesis scheme based on Radio Frequency-In-Package(RF IP) is proposed. The multiple frequency points are generated by the comb generator, the frequency band is selected by the switching filter, and the frequency spectrum shifting is performed by the secondary mixing, therefore, the broadband coverage of Ka-band is realized. The integration method of three-dimensional System-In Package(3D-SIP) compensates for the disadvantage of traditional direct frequency synthesis in achieving miniaturization. A small step variation of 100 MHz is achieved through a frequency divider and multiplier. This scheme can achieve a phase noise of -99 dBc/Hz@1 kHz, compensating for the disadvantage of Direct Digital frequency Synthesis(DDS) excited Phase-Locked Loop(PLL) small step frequency synthesis in achieving low phase noise. This frequency synthesizer has the advantages of miniaturization and low phase noise, has strong engineering application value, and can be expanded for use in various communication and radar systems.