第5期 Tang Zhangwen et al.An Accurate 1.08GHz CMOS LC Voltage-Controlled Oseillator 871 ferential spiral inductor is 12.38nH,so the single- voltages,is shown in Fig.10.The worst phase end inductor features 6.19nH.The maximum and noise is -82.2dBc/Hz at a 10kHz frequency off- minimum capacitances in LC-VCO are 4.30pF set. (Cmax and 3.180pF(Cmin).The maximum and min- imum frequencies are 1.137GHz and 0.975GHz re- Carrier Power -1.18 dBa Atten 0.08 dB Mkr 4 18.0309kHz Ref -50.00dBc/Hz -84.73 dBc/Hz 18.08 spectively.And the DC voltage is 2.1V,the mini- mum amplitude is 0.86V,the maximum amplitude is 1.OV calculated by Egs.(10).In Fig.8,the cross lines are the results of measurement,and the solid lines are calculated by Eqs.(12)and (14).The measurement agrees well with the results obtained from the theoretical oscillator tuning curves'equa- tions (12)and (14),over the entire tuning range. Frequency Offset Fig.9 Phase noise -80 -85 米米 90 9 0.5 1.01.52.02.53.03.5 Fig.7 Microphotograph of CMOS LC VCO VenlV 1.14 Fig.10 Phase noise at 10kHz frequency offset Caculation 1.12 Measurement 1.10 L=6.19nH 5 Conclusions 1.08F =1.137GHz Cm=3.180pF 美1 F Am-0.86V An accurate 1.08GHz CMOS LC-tank voltage- 1.02 controlled oscillator is implemented in a 0.35um '=2.1V 1.00 m-0.975GHz standard 2P4M CMOS process.A new convenient 0.98++ C4.30pF Am=1.00V method of calculating frequency tuning curves is 0.9 0.5 1.0 1.52.0 2.53.0 3.5 proposed.The calculated f-V curves agree perfect- ValV ly with the experiment.At 3.3V power supply,the Fig.8 f-V tuning curve of the measurement and calcu- phase noise of the LC-VCO is measured to be lation -82.2dBc/Hz at a 10kHz frequency offset.The tail current is 3.1mA. COB packaged chips are measured on a Agi- lent E4440A (3Hz~26.5GHz)PSA series spec- Acknowledgements The authors would like to trum analyzer with phase noise module.Figure 9 thank Liu Chenbo,Yi Wei,and Jiang Qifeng of shows a typical phase noise at 1.7V control volt- Shanghai Research Center for Integrated Circuit age.The phase noise measured at different ECV Design,for the support of MPW service,and thank第C期 ’*)3;<*)3]$)6J’?U! E)EHH(1*2$YZ[B0OUNQR,7N\=%2*3$/N=)21=%%$#R8H"%%*2=1 A$1$)2"*%8."1*%")#(H2=1"8YXZDB)O"8=2<$8")3%$/ $)#")#(H2=1A$*2(1$8WZY‘)Oc’<$-*T"-(-*)# -")"-(- H*.*H"2*)H$8 ") 7N/\NR *1$ aZD[.@ #!-*T$*)#DZYB[.@#!-")$c’<$-*T"-(-*)#-")/ "-(-A1$J($)H"$8*1$YZYDP0OU*)#[Z‘PC0OU1$/ 8.$H2"G$%&cE)#2<$4NG=%2*3$"8XZY\"2<$-")"/ -(-*-.%"2(#$"8[ZBW\"2<$-*T"-(-*-.%"2(#$ "8YZ[\H*%H(%*2$#+&VJ8c#Y[$cL)@"3cB"2<$H1=88 %")$8*1$2<$1$8(%28=A-$*8(1$-$)2"*)#2<$8=%"# %")$8*1$H*%H(%*2$#+& VJ8c#YX$*)# #Ya$c’<$ -$*8(1$-$)2*31$$8]$%%]"2<2<$1$8(%28=+2*")$# A1=-2<$2<$=1$2"H*%=8H"%%*2=12()")3H(1G$8%$J(*/ 2"=)8#YX$*)##Ya$"=G$12<$$)2"1$2()")31*)3$c @"3cP Q"H1=.<=2=31*.<=ANQR,7N\NR @"3cB 5"#2()")3H(1G$=A2<$-$*8(1$-$)2*)#H*%H(/ %*2"=) NR5.*HI*3$#H<".8*1$ -$*8(1$#=)*E3"/ %$)2Vaaa[E #DOU’XWZC0OU$K,E8$1"$88.$H/ 21(-*)*%&U$1]"2<.<*8$)="8$ -=#(%$c@"3(1$‘ 8<=]8*2&."H*%.<*8$)="8$*2YZP\H=)21=%G=%2/ *3$c’<$.<*8$)="8$ -$*8(1$#*2#"AA$1$)2VN\ G=%2*3$8""88<=])") @"3cY[c’<$ ]=182.<*8$ )="8$"8 gBXZX#5H&OU*2*Y[IOUA1$J($)H&=AA/ 8$2c @"3c‘ K<*8$)="8$ @"3cY[ K<*8$)="8$*2Y[IOUA1$J($)H&=AA8$2 - /8FM9I@H8F@ E)*HH(1*2$YZ[B0OUNQR,7N/2*)IG=%2*3$/ H=)21=%%$#=8H"%%*2=1"8"-.%$-$)2$#")*[ZDC$- 82*)#*1#XKaQ NQR,.1=H$88cE )$]H=)G$)"$)2 -$2<=#=AH*%H(%*2")3A1$J($)H&2()")3H(1G$8"8 .1=.=8$#c’<$H*%H(%*2$#5"# H(1G$8*31$$.$1A$H2/ %&]"2<2<$$T.$1"-$)2cE2DZD\.=]$18(..%&"2<$ .<*8$ )="8$ =A2<$ 7N/\NR "8 -$*8(1$#2= +$ gBXZX#5H&OU*2*Y[IOUA1$J($)H&=AA8$2c’<$ 2*"%H(11$)2"8DZY-Ec "MXF8T9=KR=O=F>@ ’<$ *(2<=18 ]=(%#%"I$2= 2<*)I 7"( N<$)+="M" !$""*)#?"*)3 :"A$)3=A ,<*)3<*"6$8$*1H< N$)2$1A=1L)2$31*2$# N"1H("2 4$8"3)"A=12<$8(..=12=AQK!8$1G"H$"*)#2<*)I BPY