Title :
Low Phase Noise Differential CMOS VCO Based on Tapped-Inductor Resonator
Author :
Chuang, Yun-Hsueh ; Jang, Sheng-Lyang ; Lee, Chien-Feng ; Lee, Shao-Hua ; Liu, Cheng-Bing
Author_Institution :
Nat. Taiwan Univ. of Sci. & Technol., Taipei
Abstract :
The design of a low phase noise 4 GHz voltage controlled oscillator (VCO) based on tapped inductor with 10% frequency tuning range fabricated in 0.18-um 1P6M CMOS technology is reported. The LC resonator consists of two tapped inductors and varactors. The varactors have one control terminal to vary the effective resonator capacitance, which is used to fine tune VCO output frequency. The VCO core consumes power of 7.5 mW at 1.5 V supply voltage. The measured phase noise is -121 dBc/Hz at 1MHz offset from the oscillation frequency of 4.4 GHz. The oscillation frequency can be tuned from to 4.05 GHz to 4.47 GHz. This topology can reduce the drain-to-body junction capacitance and can increase the tuning range.
Keywords :
CMOS analogue integrated circuits; MMIC oscillators; circuit tuning; field effect MMIC; inductors; integrated circuit noise; phase noise; resonators; varactors; voltage-controlled oscillators; 1P6M CMOS technology; LC resonator; drain-to-body junction capacitance; frequency 4 GHz; frequency 4.05 GHz to 4.47 GHz; frequency tuning; low phase noise differential CMOS VCO; oscillation frequency; power 7.5 mW; size 0.18 mum; tapped-inductor resonator; varactors; voltage 1.5 V; voltage controlled oscillator; CMOS technology; Capacitance; Frequency measurement; Inductors; Noise measurement; Phase noise; Tuning; Varactors; Voltage measurement; Voltage-controlled oscillators;
Conference_Titel :
VLSI Design, Automation and Test, 2007. VLSI-DAT 2007. International Symposium on
Conference_Location :
Hsinchu
Print_ISBN :
1-4244-0583-1
Electronic_ISBN :
1-4244-0583-1
DOI :
10.1109/VDAT.2007.373249
