电子学报2025，Vol.53Issue(9)：3202-3210,9.DOI:10.12263/DZXB.20250667
一种用于片上时钟系统的单粒子不敏感振荡器
A Single-Event Immune Oscillator for On-Chip Clock Systems
摘要
Abstract
With the continuous evolution of advanced semiconductor processes,chip integration and complexity have significantly increased.System clock design is gradually shifting from off-chip crystal oscillators to on-chip clock systems.frequency-locked loop(FLL)clock reference generation circuits based on Inductor-Capacitor voltage-controlled oscillators(LCVCOs)have become a key technology for high-reliability electronic systems due to their excellent noise suppression characteristics and strong radiation resistance capabilities.However,existing LCVCO architectures are highly sensitive to single-event effects in capacitor arrays and tail current sources,which can easily cause system failures in space radiation en-vironments,severely limiting their application prospects in aerospace.To address these issues,this paper proposes a novel LCVCO architecture aimed at enhancing the robustness of reliable on-chip clock systems.This architecture introduces dy-namic self-bias feedback technology,dynamically adjusting the bias voltage of the tail current source through real-time os-cillation signals to effectively suppress 1/f noise and achieve self-stabilization control of output amplitude.The phase noise and single-event sensitivity of oscillators are evaluated and compared based on the impulse sensitivity function(ISF).Simu-lation results show that the ISF curve of the LCVCO designed in this paper has lower amplitude and better symmetry at criti-cal nodes,significantly improving noise performance and single event transient(SET)tolerance.Additionally,the resonant tank uses an NMOS-type capacitor array unit with low-impedance discharge paths,which can quickly discharge single-event transient currents,reducing frequency fluctuations caused by them.The design is implemented using fin field-effect transistor(FinFET)technology,occupying an area of 0.06 mm² and consuming 9.6 mW of power.At a 26 MHz output clock,the phase noise is optimized to-136 dBc/Hz@1MHz,with a figure of merit(FoM)value of 154.5 dBc/Hz@1MHz,and the root mean square(RMS)value of cycle jitter is 5.93 ps.Laser experiments show that the laser triggering threshold of the LCVCO designed in this paper has been increased to 1.5 nJ,an improvement of 114.3%compared to traditional structures,greatly reducing the impact of single-event effects.Heavy-ion irradiation experiments were conducted at a linear energy transfer(LET)value of 86.1 MeV·cm²/mg,showing that the maximum frequency deviation is less than 4.5%.The simula-tion and experimental results fully validate the high reliability of this circuit in the space radiation environment,which pro-vides a more robust clocking solution for spaceborne electronic equipment.关键词
振荡器/锁相环/时钟/相位噪声/单粒子瞬态/脉冲灵敏度函数Key words
oscillator/phase-locked loop/clock/phase noise/single event transient/impulse sensitivity function分类
信息技术与安全科学引用本文复制引用
桑浩,袁珩洲,郭阳,刘胜,陈小文,徐炜遐..一种用于片上时钟系统的单粒子不敏感振荡器[J].电子学报,2025,53(9):3202-3210,9.基金项目
国家自然科学基金(No.62174180) National Natural Science Foundation of China(No.62174180) （No.62174180）
