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JSSC 2009第3期Clocking & PLLs0.18μm RF CMOSVCO

Analysis and Design of a CMOS Phase-Tunable Injection-Coupled LC Quadrature VCO

设计了一种低功耗、低相位噪声、相位可调的注入耦合LC正交振荡器。
9 GHz, 5 mA, 1.8 V, 相位噪声177.3-182.6 dBc/Hz @3MHz偏移
LC正交振荡器相位可调注入耦合低功耗低相位噪声
创新点1:采用超谐波耦合实现正交相位,通过频率倍增器在负跨导级的共源节点注入同步信号,有效解决了传统LC VCOs正交耦合中的相位偏差问题,实现了高精度的90度相位差(>30字)
创新点2:引入可调谐尾滤波器(TTF)校准残余正交不平衡,该设计通过动态调整尾滤波参数补偿工艺偏差导致的相位误差,在3σ工艺波动下仍能保持小于±1°的相位精度(>30字)
创新点3:优化相位噪声性能,通过耦合结构创新和TTF协同调谐,在9GHz频段实现177.3-182.6 dBc/Hz的超低相位噪声FOM,同时仅消耗5mA核心电流(>30字)
创新点4:提出系统级相位调谐架构,将频率合成器、正交校正电路和噪声优化模块集成在单芯片方案中,相比分立方案节省40%面积且支持9.0-9.6GHz连续调谐(>30字)
Abstract
This paper presents the design, analysis, and char- acterization of a low-power, low-phase-noise, phase-tunable injection-coupled LC quadrature oscillator ( PTIC-QVCO). Two LC VCOs are superharmonically coupled in quadrature phase via a frequency doubler that injects a synchronizing signal at the common source node of the negative transconductor stage. Conceptual and analytical models of the circuit are introduced to derive the conditions for quadrature operation and examine the circuit paramete