一种基于多级电容衰减技术的低电压数控振荡器  

A Low-voltage Digitally Controlled Oscillator Based on Multi-stage Capacitance Shrinking Technique

作　　者：王子轩[1] 王鑫 蔡志匡[1] 吉新村[1] 罗弘毅 郭宇锋[1] ANG Zixuan;WANG Xin;CAI Zhikuang;JI Xincun;LUO Hongyin;GUO Yufeng(College of Electronic and Optical Engineering&College of Microelectronics,Nanjing University of Posts and Telecommunications,Nanjingt 210000,CHN;School of Information Engineering,Wuhan University of Technology,Wuhan,430000,CHN)

机构地区：[1]电子与光学工程学院、微电子学院,南京邮电大学,南京210000 [2]信息工程学院,武汉理工大学,武汉430000

出　　处：《固体电子学研究与进展》2019年第5期344-349,385,共7页Research & Progress of SSE

基　　金：国家自然科学基金青年基金资助项目(61504061)

摘　　要：提出了一款工作在低电压(0.5~0.7 V)下的LC数控振荡器(Digitally controlled oscillator,DCO),采用电流复用结构的MOS对管为DCO起振提供能量,降低了DCO消耗的电流。提出一种多级电容衰减技术,在不增加功耗的前提下,使电容衰减系数达到0.002,并将单位可变电容值从4 fF减小到8 aF;在2.4 GHz频率下,使频率分辨率达到8 kHz。提出的LC-DCO在130 nm CMOS工艺下进行了流片验证,测试结果表明,在0.6 V电源电压下,功耗为6.6 mW,1 MHz频偏处的相位噪声从-126.7 dBc/Hz到-125.95 dBc/Hz,实现了195 dB的FoM。An LC digitally controlled oscillator(DCO)at low supplies(0.5~0.7 V)was presented in this paper.MOS transistors with a current-reuse structure were used to provide energy of oscillation and further lower the consumed current of the DCO.A multi-stage capacitance shrinking technique was proposed.The shrinking factor of capacitance is 0.002 and the unit variable capacitance of LC tank is reduced from 4 fF to 8 aF without increasing any power.The resolution is thereby up to 8 kHz at the frequency of 2.4 GHz.The proposed LC-DCO is fabricated in a 130 nm CMOS technology.The measurement results show that the DCO core consumes 6.6 mW at a 0.6 V supply.Phase noise at a 0.6 V supply are from-126.7 dBc/Hz@1 MHz to-125.95 dBc/Hz@1 MHz.The FoM of 195 dB is achieved.

关 键 词：数控振荡器 低功耗 低电压 多级电容衰减 频率分辨率 

分 类 号：TP333[自动化与计算机技术—计算机系统结构]