172 复旦学报（自然科学版） 第44卷 1999,34(5):717724 [9]Bunch R,Raman S.A0.35 Wm CMOS 2.5 GHz complementary Gm VCO using PMOS inversion mode varactors [J ] 2001 IEEE Radio Frequency Integrated Circuits Sympasium.2001,5:49-52. [10]Liu T P.A 6.5 Gz monolithic CMOS voltage-controlled oscillators [J ]ISSCC Tech Dig,1999,2:404-405. Design of 1.5 V LC Voltage-Controlled High Frequency Oscillator of Low Phase Noise WU Rong,YI Xiao-feng,TANG Zhang wen,SU Yamrfeng,HONG Zhi-liang (ASIC System State Key Laboratory.Fudan University.Shanghai 200433.China) Abstract:It is described the design of a voltage-controlled oscillator for the DCS1800 system.The center frequency of the os cillator is 3.6GHz.The analysis and comparison of three methods to reduce phase noise are presented theoretically,and the simulation results are shown.Then the optimization analysis of the parameters of the device is presented.LCfiltering techrology is used to reduce the phase noise.The phase noise at 600 kHz away from the center frequency is-117 dBc/Hz,the tuning range is up to 26.7%.The static current is 6 mA at 1.5 V. Keywords:semiconductor technology;voltage controlled oscillator(VCO);phase noise;LC noise filtering technology (上接第138页) [5]Prodic A,Dragan M.Mixed signal simulation of digitally controlled switching converters [J ]IEEE COMPEL,2002,6 (1):3436. [6]Allen P E,Holberg D R.CMOS Analog Circuit Design,2Ed[M].北京：电子工业出版社，2002. Delay-ring A/D and Its Application in DC/DC Control Chip HU Jun,LI Wemhong (ASIC System State Key Laboratory.Fudan University,Shanghai 200433.China) Abstract:A nomrclock delay-ring A/D converter is presented,which is based on standard cell library and not sensitive to pro cess variation.The architecture of thisA/D converter is simple,and its speed is high.Meanwhile there is no need of any control signal.This A/D converter can be used in higlrfrequency digital control chip of DC/DC converter. Keywords:semiconductor technology;DC/DC;PWM;PID control;delayring A/D 1995-2005 Tsinghua Tongfang Optical Disc Co..Lid.All rights reserved.1999 , 34 (5) : 7172724. [9 ] Bunch R , Raman S. A 0. 35μm CMOS 2. 5 GHz complementary2Gm VCO using PMOS inversion mode varactors [J ]. 2001 IEEE Radio Frequency Integrated Circuits Symposium , 2001 , 5 : 49252. [10 ] Liu T P. A 6. 5 GHz monolithic CMOS voltage2controlled oscillators [J ]. ISSCC Tech Dig , 1999 , 2 : 4042405. Design of 1. 5 V LC Voltage2Controlled High Frequency Oscillator of Low Phase Noise WU Rong , YI Xiao2feng , TAN G Zhang2wen , SU Yan2feng , HON G Zhi2liang ( ASIC & System State Key Laboratory , Fudan University , Shanghai 200433 , China) Abstract : It is described the design of a voltage2controlled oscillator for the DCS21800 system. The center frequency of the os2 cillator is 3. 6 GHz. The analysis and comparison of three methods to reduce phase noise are presented theoretically , and the simulation results are shown. Then the optimization analysis of the parameters of the device is presented. LC filtering technology is used to reduce the phase noise. The phase noise at 600 kHz away from the center frequency is - 117 dBc/ Hz , the tuning range is up to 26. 7 %. The static current is 6 mA at 1. 5 V. Keywords : semiconductor technology ; voltage controlled oscillator (VCO) ; phase noise ; LC noise filtering technology ～～～～～～～～～～～～～～～～～～～～～～～～～～～～～～～～～～～～～～～～～～～～～～～～～～～～ (上接第 138 页) [5 ] Prodic’ A , Dragan M. Mixed2signal simulation of digitally controlled switching converters [J ]. IEEE COMPEL ,2002 ,6 (1) :34236. [6 ] Allen P E , Holberg D R. CMOS Analog Circuit Design ,2ndEd [M]. 北京 :电子工业出版社 ,2002. Delay2ring A/ D and Its Application in DC/ DC Control Chip HU J un , LI Wen2hong ( ASIC & System State Key Laboratory , Fudan University , Shanghai 200433 , China) Abstract : A non2clock delay2ring A/ D converter is presented ,which is based on standard cell library and not sensitive to pro2 cess variation. The architecture of this A/ D converter is simple ,and its speed is high. Meanwhile there is no need of any control signal. This A/ D converter can be used in high2frequency digital control chip of DC/ DC converter. Keywords : semiconductor technology ; DC/ DC ; PWM; PID control ; delay2ring A/ D 271 复 旦 学 报(自然科学版) 第 44 卷 © 1995-2005 Tsinghua Tongfang Optical Disc Co., Ltd. All rights reserved