摘要
为改善振荡器相位噪声性能,设计了一种带有尾电流源反馈的薄膜体声波谐振器(FBAR)振荡器。研究表明,尾电流源晶体管闪烁噪声和谐振回路是振荡器相位噪声的主要来源。为了降低尾电流源晶体管闪烁噪声对振荡器相位噪声的影响,采用两组对称分离且工作在亚阈值区域的P型金属氧化物半导体(PMOS)偏置电流源进行尾电流反馈。与传统单个尾电流源相比,该技术具有更好的相位噪声性能。同时,基于对Hajimiri噪声模型的分析,利用尾电流源反馈技术,控制振荡器在振幅达到峰值及零穿越点时的电流大小,以进一步改善相位噪声性能。高Q值谐振器可以显著提高振荡器的整体相位噪声性能,因此,设计采用高Q值微机电系统(MEMS)器件FBAR作为谐振腔,并通过TSMC 180 nm RF CMOS工艺完成电路设计。结果表明:该振荡器输出频率为1.93 GHz,整体电路功耗为580μW,在1 kHz偏频处相位噪声为-89.7 dBc/Hz,计算得到灵敏值(Factor Of Merit,FOM)为217 dB。
A Film Bulk Acoustic Resonator(FBAR)oscillator with tail-current source feedback is designed to improve the phase noise performance of the oscillator.Research shows that the flicker noise of the transistor of tail current source and the resonant loop are main sources of phase noise of the oscillator.In order to reduce the impact of flicker noise in the transistor of tail current source on phase noise of the oscillator,the tail current feedback technique is adopted,which employs two sets of symmetrical split Positive channel Metal Oxide Semiconductor(PMOS)biased current source operating in the subthreshold region.Compared with the traditional single tail current source,it shows better phase noise performance.Based on the analysis of Hajimiri noise model,the tail current source feedback technology is used to control the current magnitude of the oscillator when the amplitude reaches peak and zero-ride-through point to improve the phase noise performance.A high Q resonator can significantly improve the phase noise performance of the oscillator.The design is based on the TSMC 180 nm RF CMOS process.With a high Q value Micro-Electro-Mechanical Systems(MEMS)device FBAR as the resonator,the oscillator has a output frequency of 1.93 GHz.The post simulation results show that power consumption is 580μW,the oscillator can achieve phase noise at 1 kHz offset frequency of-89.7 dBc/Hz and Factor Of Merit,FOM(FOM)of 217 dB.
作者
丁增辉
黄继伟
DING Zenghui;HUANG Jiwei(College of Physics and Information Engineering,Fuzhou University,Fuzhou 350108,China)
出处
《微电子学与计算机》
2024年第1期113-117,共5页
Microelectronics & Computer
基金
福建省中央引导地方科技发展专项(2020L3021)
福建省自然科学基金(2020J01467)。
