Research on Key Technologies of Low-Jitter Frequency Synthesizers

The development of advanced communication technologies has put forward strict requirements on local oscillator (LO) signal sources, and frequency synthesizers need to achieve low-jitter performance to meet the requirements of 5G communication protocols. This paper discusses fractional-N frequency synthesizer architectures for sub-6GHz and millimeter wave (mm-Wave) frequency bands, introduces advanced techniques to achieve low phase noise (PN) and low spur level, and also introduces low-jitter LO generation schemes. Finally, the development direction of frequency synthesizers is prospected.