摘要
设计了一种基于标准0.18μm CMOS工艺的4级延迟单元的全差分环形压控振荡器。提出了一种新颖的环形振荡器电路结构,通过结合控制耦合强度与改变负载电阻值的方法,改善了单一技术在有限的电压范围内的调谐线性度,实现整个电压范围内的高调谐线性度;采用双通路技术提高了振荡频率,同时运用交叉耦合正反馈减少输出电平翻转时间,改善相位噪声特性,提高性能。后仿真结果表明,在电源电压为1.8 V时,VCO的中心频率为2.8 GHz,核心电路的功耗为18.36 mW,调谐范围为2.05 GHz^3.35 GHz,当频率为2.8 GHz时,相位噪声为-89.6 dBc/Hz@1 MHz。
A four-stage fully differential ring-voltage-controlled oscillator（ring-VCO） is presented based on 0. 18μm CMOS technology. The delay cell is optimized by a combining method for controlling the power of the cross-coupled MOS and modifying the load resistance value. The method can improve the linear character- istics of the circuits. Meanwhile, the dual-delay path technique is used to improve the frequence and a cross coupling positive feedback is used to reduce the transition time of the output. Measurements show that the os- cillators have linear frequency-voltage characteristics over a wide tunning range. At 1.8 V supply voltage, the VCO has a power consumption of 18.36 mW and a output frequence range from 2.05 GHz to 3.35 GHz. The phase noise is -89.6 dBc/Hz at 1 MHz offset from the center frequence of 2.8 GHz.
出处
《南京邮电大学学报（自然科学版）》
北大核心
2014年第2期100-104,共5页
Journal of Nanjing University of Posts and Telecommunications：Natural Science Edition
基金
国家自然科学基金(61076073)
教育部博士点基金(20133223120005
20133223110003)
中国博士后科学基金(2012M521126)
江苏省自然科学基金(BK20130878
BK2012435)
南京邮电大学科研项目(NY211016
NY213145)
南京邮电大学科学技术创新培训计划(SJD2012006)资助项目
