Title :
A 1-V 2.4-GHz CMOS frequency synthesizer with current-match charge pump
Author :
Wu, Chung-Yu ; Hsieh, Chih-Yuan ; Chen, Wei-Ming
Author_Institution :
Inst. of Electron., Nat. Chiao-Tung Univ., Hsinchu
Abstract :
A 1-V 2.4-GHz fully integrated frequency synthesizer for Bluetooth applications is proposed and designed in 0.25-mum CMOS technology. An improved current-match charge pump circuit without the start-up problem is used to reduce the spur level. Moreover, a bandswitching VCO is used to reduce the Kvco and hence the spur level can be further reduced. The prescaler is designed in 1-V supply voltage without the supply-voltage boosting. The circuit is verified by both HSPICE and ADS simulations
Keywords :
Bluetooth; CMOS integrated circuits; frequency synthesizers; integrated circuit design; voltage-controlled oscillators; 0.25 micron; 1 V; 2.4 GHz; ADS simulations; Bluetooth applications; CMOS integrated circuit; HSPICE; bandswitching VCO; current-match charge pump; frequency synthesizer; spur level; start-up; supply-voltage boosting; CMOS technology; Charge pumps; Circuit simulation; Frequency synthesizers; Operational amplifiers; Radio frequency; Transconductors; Tuning; Voltage; Voltage-controlled oscillators;
Conference_Titel :
Circuits and Systems, 2004. Proceedings. The 2004 IEEE Asia-Pacific Conference on
Conference_Location :
Tainan
Print_ISBN :
0-7803-8660-4
DOI :
10.1109/APCCAS.2004.1412789
