JSSC 2024第1期Clocking & PLLs65nmVCO

A Low-Phase-Noise VCO With Common-Mode Resonance Expansion and Intrinsic Differe

提出一种采用三线圈变压器的低相位噪声VCO，具有共模谐振扩展和本征差分二次谐波输出。

12.3-15.2 GHz, -118.0 dBc/Hz @1MHz, 8.4-9.6 mW, 0.06 mm2

压控振荡器相位噪声共模谐振二次谐波CMOS

▸创新点1：共模谐振带宽扩展技术，通过引入第三个线圈动态调控共模响应，无需手动调谐即可实现宽带宽共模谐振，显著提升相位噪声性能（相位噪声达-118.0 dBc/Hz @1MHz）。

▸创新点2：本征差分二次谐波输出设计，利用三线圈变压器结构直接生成差分二次谐波信号，省去额外倍频器电路，降低功耗（节省倍频器功耗约2-3mW）。

▸创新点3：堆叠8字形电感拓扑结构，将第三线圈集成于Class-F变压器内部，在零面积开销下实现功能扩展（芯片面积仅0.06mm²），同时保持高品质因数。

▸创新点4：复合谐振系统创新，结合Class-F谐振器与CM谐振扩展技术，实现基波与二次谐波同步优化（FoM达190.4/190.1dBc/Hz），突破传统VCO带宽-噪声权衡限制。

Abstract

In this article, we propose a voltage-controlled oscillator (VCO) with a single three-coil transformer, featuring a common-mode (CM) resonance expansion and intrinsic dif- ferential 2nd harmonic output. In addition to a conventional transformer-based class-F resonator, an internal third coil is added to manipulate the CM response. On one hand, it expands the CM resonance bandwidth, eliminating the need for manual harmonic tuning to align the 2nd harmonic resonance. On the other hand, it creates