In this letter, low-phase-nose multicore class-F voltage-controlled oscillators (VCOs) using coupled-lined-based synchronization topology are proposed. Compared to traditional resistance-coupled multicore VCOs, the proposed coupled-line-based topology improves the $Q$ of the small inductors in the millimeter-wave frequency range. Mode ambiguity is eliminated for a robust oscillation startup. Quad-core and oct-core VCO prototypes are designed and implemented in 65-nm CMOS process, which exhibit a measured frequency tuning range of 20.5% centered at 31.32 GHz. The quad-core VCO has a measured phase noise (PN) of −134.33 dBc/Hz and a corresponding FoM of 191.32 dBc/Hz at 10-MHz offset from 28.28 GHz. The oct-core VCO has a measured PN of −137.23 dBc/Hz and a corresponding FoM of 191.08 dBc/Hz at 10-MHz offset from 28.16 GHz.

中文翻译：

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使用基于耦合线的同步拓扑的 30GHz 低相位噪声可扩展多核 F 类压控振荡器

在这封信中，提出了使用基于耦合线的同步拓扑的低相鼻多核 F 类压控振荡器 (VCO)。与传统的电阻耦合多核 VCO 相比，所提出的基于耦合线的拓扑改进了 $Q$毫米波频率范围内的小电感器。消除了模式模糊性以实现稳健的振荡启动。四核和八核 VCO 原型采用 65-nm CMOS 工艺设计和实现，其测量的频率调谐范围为 20.5%，中心频率为 31.32 GHz。四核 VCO 的测量相位噪声 (PN) 为 -134.33 dBc/Hz，对应的 FoM 为 191.32 dBc/Hz，偏移 28.28 GHz 为 10 MHz。八核 VCO 的测量 PN 为 -137.23 dBc/Hz，对应的 FoM 为 191.08 dBc/Hz，偏移 28.16 GHz 为 10-MHz。