近日，东南大学崔铁军团队开发了一种具有超高相位精度和品质图的等离子体元旋转行波振荡器。相关论文于2025年8月21日发表在《光：科学与应用》杂志上。

正交信号的高相位精度和优值图（FOM）是集成系统的必要条件，包括正交调幅（QAM）通信和多输入多输出（MIMO）雷达。然而，传统的正交振荡器往往难以同时满足高FOM和高正交相位精度的严格要求。

为了解决这一挑战，研究组提出了一种欺骗表面等离子激元波导（Meta）来设计片上旋转行波振荡器（RTWO）。通过利用Meta先进的色散操纵能力，传输线（TL）的物理和电气长度被有效地解耦，从而克服了谐振器内外环电长度不相等的限制，这在传统的RTWO中很难实现。

基于设计方法，研究组采用65纳米CMOS技术，实现了测量FOM为188.5 dBc/Hz，相位误差约为0.21°。这些指标甚至超过了由更先进的28纳米CMOS工艺。该研究表明，在工艺限制下，Meta-RTWO在不添加额外相位调整结构的情况下，显著提高了输出信号正交精度和FOM。

附：英文原文

Title: A plasmonic meta-rotary travelling-wave oscillator with ultrahigh phase accuracy and figure of merit

Author: Yao, Da Yue, Zhang, Hao Chi, He, Pei Hang, Shen, Jia Jie, Zhu, Jia Wen, Zhou, Peigen, Zhang, Xin Yu, Zhang, Le Peng, Wu, Li Jie, Wei, Cun Yue, Shao, Rui Wen, Fan, Yi, Zhao, Yang, Chen, Jixin, Hong, Wei, Cui, Tie Jun

Issue&Volume: 2025-08-21

Abstract: High phase accuracy and figure of merit (FOM) of quadrature signals are essential for integrated systems, including quadrature amplitude modulation (QAM) communications and multi-input multi-output (MIMO) radar. However, the traditional quadrature oscillators often struggle to meet the stringent requirements of high FOM and high quadrature phase accuracy simultaneously. To address this challenge, we propose a spoof surface plasmon polariton (SPP) metawaveguide (Meta) to design on-chip rotary traveling-wave oscillator (RTWO). By leveraging the advanced dispersion manipulation capability of Meta, the physical and electrical lengths of transmission line (TL) are effectively decoupled, thereby overcoming the limitations associated with the unequal electrical lengths of inner and outer loops of the resonator, which is difficult to achieve in the conventional RTWOs. Based on the design methodology, we realize a Meta-RTWO using the 65nm CMOS technology and achieve a measured FOM of 188.5 dBc/Hz and a phase error of approximately 0.21°. These metrics surpass those of the traditional oscillators fabricated even by more advanced 28nm CMOS processes. This study demonstrates that Meta-RTWO achieves a significant improvement in both output signal quadrature accuracy and FOM under process limitations without using additional phase adjustment structures.

DOI: 10.1038/s41377-025-01966-z

Source: https://www.nature.com/articles/s41377-025-01966-z