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本文提出一种基于双模变压器磁控技术的28nm CMOS串联谐振VCO，实现了10.2至16.2GHz（45.2%）的宽调谐范围，并在10MHz偏移处获得>201.1dBc/Hz的FoMT和207.7dBc/Hz的FoMAT。通过变压器优化方法，不同模式间相位噪声和FoM变化小于2dB，并集成采样PLL实现<18.1fs的均方根抖动。
Abstract This work presents a 28nm CMOS SR-VCO enabled by a dual-mode transformer with magnetic control, achieving a wide tuning range of 10.2 to 16.2GHz (45.2%) and a high FoMT/FoMAT@10MHz of 201.1/207.7dBc/Hz. A transformer optimization method is introduced to ensure consistent performance across modes, achieving less than 2dB variation in measured PN and FoM at 10MHz. A sampling PLL incorporating the presented SR-VCO demonstrates rms jitter <18.1fs and FoMJT of -265.8dB. While series-resonance voltage-controlled oscillators (SR-VCOs) are gaining increased popularity in the communication systems beyond 5G by virtue of their superior phase-noise (PN) performance, their tuning range (TR) is typically limited to below 20% due to the small on/off capacitance ratio of the switched capacitor array, which restricts multi-band operation. This limitation stems from the need for relatively large MOS switches to ensure
Yang Li, Yanchao Liu, Kaihang Wang, Dong Pu, Xiaohua Yu, Ronghua Ni
Fudan University, Shanghai, China