一种工作在近阈值电源电压下的高分辨率数控振荡器  

An high-resolution digitally controlled oscillator under near-threshold supply

作　　者：黄曼玉 万哲辛 吴桐 邵陆钦 郭宇锋[1,2] 王子轩[1,2] HUANG Manyu;WAN Zhexin;WU Tong;SHAO Luqin;GUO Yufeng;WANG Zixuan(College of Electronic and Optical Engineering,Nanjing University of Posts and Telecommunications,Nanjing 210023,China;National and Local Joint Engineering Laboratory of RF Intergration and Micro-Assembly Technology,Nanjing University of Posts and Telecommunications,Nanjing 210023,China)

机构地区：[1]南京邮电大学电子与光学工程学院,江苏南京210023 [2]南京邮电大学射频集成与微组装技术国家地方联合工程实验室,江苏南京210023

出　　处：《南京邮电大学学报（自然科学版）》2020年第6期63-70,共8页Journal of Nanjing University of Posts and Telecommunications：Natural Science Edition

基　　金：国家自然科学基金(61504061,61974073)资助项目。

摘　　要：文中提出了一种工作在近阈值电源电压下的LC数控振荡器(Digitally Controlled Oscillator, DCO),该振荡器采用PMOS管和NMOS管的交叉耦合结构实现了电流复用,降低了DCO的工作电流。DCO基于一种多阶电容桥接技术,在不采用ΔΣ调制器且不增加DCO功耗的前提下将单位可变电容值由3.2 fF减小到6.7 aF,提高了DCO的分辨率。文中提出的LC-DCO在130 nm CMOS工艺下进行了流片验证,测试结果显示,在0.5 V电源电压,输出频率为2.4 GHz时,电路功耗为0.425 mW,分辨率为9 kHz, 1 MHz频偏处的相位噪声为-122.2 dBc/Hz, FoM为193.52 dB。A LC digitally controlled oscillator( LC-DCO) under near-threshold supply is proposed.The cross-coupling structure of PMOS and NMOS transistors is used to achieve current multiplexing, thus reducing the current of the DCO.A multi-stage capacitance attenuation technology is used for improving the resolution of the DCO without ΔΣ modulator and the power consumption of the DCO is reduced.And the unit variable capacitance value is reduced from 3.2 fF to 6.7 aF.The resolution is 9 kHz when the output frequency is 2.4 GHz.The LC-DCO is tested in 130 nm CMOS process.The measurement results show that the power consumption of the circuit is 0.425 mW at 0.5 V supply voltage, the phase noise is-122.2 dBc/Hz, and the FoM is 193.52 dB.

关 键 词：数控振荡器 分辨率 近阈值电源电压 低功耗 

分 类 号：TN752[电子电信—电路与系统]