← 返回 JSSC 论文列表JSSC 2019第3期Clocking & PLLs130nmVCO
A Noise Circulating Oscillator
提出一种噪声循环交叉耦合压控振荡器，显著降低相位噪声并提升性能指标。
2.35GHz, 1.2V, 2.15mA, 193.1dBc/Hz FoM@100kHz, 18.6%调谐范围
压控振荡器相位噪声噪声循环变压器谐振腔CMOS
▸创新点1：噪声循环有源核心设计（方法创新）。通过引入变压器基谐振腔和噪声循环机制，有效抑制了有源器件的噪声功率，同时保持与传统交叉耦合VCO相同的负阻特性。该设计在130-nm CMOS工艺中实现了193.1 dBc/Hz的优异FoM，相位噪声角频率低至50 kHz。
▸创新点2：宽带噪声抑制技术（系统创新）。利用噪声循环的宽带特性，显著改善了1/f²和1/f³区域的相位噪声性能，且在18.6%的调谐范围内（2.05-2.47 GHz）保持FoM >192.8 dBc/Hz，突破了传统VCO的窄带噪声优化局限。
▸创新点3：低相位噪声角频率（性能创新）。通过噪声循环技术将1/f³相位噪声角频率压缩至<60 kHz，相比传统设计降低至少50%，同时实现-25/-13 MHz/V的低电源频率推移，提升了频率稳定性。
▸创新点4：变压器基谐振腔优化（电路创新）。创新性地结合变压器结构与噪声循环机制，在0.36mm²核心面积下实现2.35GHz振荡，功耗仅2.15mA@1.2V，达成面积-功耗-噪声的协同优化。
Abstract
This paper presents a noise circulating cross- coupled voltage-controlled oscillator (VCO) topology with a transformer-based tank. The introduced noise circulating active core greatly suppresses the effective noise power from the active devices while offering the same amount of negative resistance compared to conventional cross-coupled VCO topologies. The mechanism of noise circulation is investigated with theoretical analysis and further verified by simulation. Due to the broad- band nature of the noise circulating technique, the resulting VCO phase noise in both 1/ f 2 and 1/ f 3 regions is greatly improved over a wide frequency tuning range. A prototype VCO at 2.35 GHz is implemented in a standard 130-nm bulk CMOS process with 0.36-mm 2 core area. It draws 2.15 mA from a 1.2-V supply. The measured figure-of-merit (FoM) is 193.1/195.0/195.6 dBc/Hz at 100k/1M/10MHz offsets with a 1/ f 3 phase noise corner of only 50 kHz. The VCO design consistently achieves >192.8 dBc/Hz FoM at 100k/1M/10MHz offsets and <60 kHz 1/ f 3 phase noise corner over its entire 18.6% frequency tuning range (2.05 − 2.47 GHz). It also exhibits low supply frequency pushing of −25 and −13 MHz/V at the highest and lowest frequencies, respectively.