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A Magnetically Tuned
通过磁调谐实现连续频率调谐的变压器-电容正交振荡器
3.2GHz-7.3GHz频率范围, 176.5dB FoM@3.2GHz, 24mW功耗, 1.5°相位误差
正交振荡器磁调谐变压器-电容相位噪声CMOS
▸创新点1：磁调谐连续频率调谐技术，通过控制变压器-电容谐振槽的磁场实现连续频率调谐，频率范围从3.2 GHz到7.3 GHz，扩展了传统变容二极管调谐的局限性。
▸创新点2：变压器-电容正交振荡器结构，采用两个相同的变压器-电容振荡器单元构成反馈环路，通过磁耦合实现相位对齐，确保正交相位精度（最大偏差1.5°），同时优化了相位噪声性能。
▸创新点3：相位噪声优化设计，通过磁耦合调节谐振槽电抗，在3.2 GHz和6.4 GHz下分别实现176.5 dB和170.5 dB的相位噪声品质因数，显著提升了高频振荡器的噪声性能。
▸创新点4：采用65 nm CMOS工艺集成MOS变容二极管，进一步扩展工作带宽，同时将最大功耗控制在24 mW，实现了高能效与宽调谐范围的平衡。
Abstract
Continuous frequency tuning by control of the mag- netic field of a transformer—capacitor tank, in a selective oscil- lator, is explored in this work. A quadrature generator is built connecting two identical transformer—capacitor oscillator cells in a feedback loop. The topology itself assures the currents in the transformer windings are aligned in phase, while their relative am- plitude determines, via magnetic coupling, oscillators’ tank reac- tance, i.e., oscillation frequency. This paper introduces the idea, an- alyzes oscillation amplitude, frequency tuning band, phase noise, and phase accuracy, and discusses design and experiments. Pro- totypes, realized in 65 nm CMOS, employing MOS varactors to further extend operation bandwidth, show the following perfor- mances: 3.2 GHz and 7.3 GHz minimum and maximum oscilla- tion frequency, respectively. Phase noise figure of merit of 176.5 dB at 3.2 GHz and 170.5 dB at 6.4 GHz is observed, with 24 mW maximum power consumption and 1.5 maximum deviation from quadrature.