摘要
针对环形振荡器的功耗大、噪声大、线性度差等问题,基于TSMC 55 nm工艺,提出了一种新型交叉前馈结构环形振荡器电路。深入分析了器件自身热噪声、闪烁噪声对环形振荡器输出相噪贡献百分比,利用电容滤波技术来降低振荡器输出相噪,采用源极负反馈电路得到线性电流来改善调频线性度,并提供了宽调谐范围。Spectre RF仿真结果表明,设计的环形振荡器频率覆盖范围为0.2 GHz^3.8 GHz,产生8相位,相位噪声为-91.34 d Bc/Hz@1 MHz,在1.2 V电源电压下消耗电流为4.6 m A,线性度良好。
Aiming at the problems of the ring oscillator such as large power consumption,loud noise,linearity deficiency etc.,a novel ring oscillator with cross feed forward structure is proposed based on TSMC 55 nm process.After the contribution percentage of device thermal noise and flicker noise on the output phase noise is analyzed,the capacitance filtering technique is applied to reduce the output phase noise.The linear current is obtained with the source negative feedback circuit to improve the linearity of the frequency modulation,and offers a wide tuning range.The Spectre RF simulation results show that the designed ring oscillator has a frequency coverage of 0.2 GHz^3.8 GHz,produces 8 phases.Its phase noise is-91.34 dBc/Hz@1 MHz,and the current consumption is 4.6 mA at the 1.2 V supply voltage.The results also indicate the good linearity.
作者
李新
张海宁
刘敏
Li Xin;Zhang Haining;Liu Min(School of Information Science and Engineering,Shenyang University of Technology,Shenyang 110870,China)
出处
《电子技术应用》
2018年第4期40-43,47,共5页
Application of Electronic Technique
关键词
环形振荡器
低功耗
交叉前馈
相位噪声
ring oscillator
low power consumption
cross feed forward
phase noise
