Title :
A 4∼7GHz ultra wideband VCO with tunable active inductor
Author :
Mehrabian, M. ; Nabavi, A. ; Rashidi, N.
Author_Institution :
Dept. of Electr. & Comput. Eng., Tarbiat Modares Univ., Tehran
Abstract :
An ultra-wideband CMOS VCO with tuning range of 3.8~7.4 GHz is presented, using tunable active inductor (TAI). The inductance of TAI can be tuned from 0.34~0.61 nH by active tunable resistor, and exhibits a quality factor of about 90. The VCO is designed in a 0.18 um CMOS technology with power dissipation of around 29.1 mW and phase noise (PN) of -92.05 dBc/Hz. PLL-based and LC-based phase noise reduction techniques are also examined. The former and latter reduces the phase noise by 1 dBC/Hz and 3 dBC/Hz, respectively.
Keywords :
CMOS integrated circuits; Q-factor; active networks; inductors; phase noise; ultra wideband technology; voltage-controlled oscillators; LC-based phase noise reduction techniques; PLL-based phase noise reduction techniques; active tunable resistor; frequency 3.8 GHz to 7.4 GHz; inductance; quality factor; size 0.18 mum; tunable active inductor; ultra-wideband CMOS VCO; Active inductors; Circuit optimization; Frequency; Phase noise; Q factor; Resistors; Tunable circuits and devices; Tuning; Ultra wideband technology; Voltage-controlled oscillators; active inductor; tuning range; ultra wideband; voltage controlled oscillator;
Conference_Titel :
Ultra-Wideband, 2008. ICUWB 2008. IEEE International Conference on
Conference_Location :
Hannover
Print_ISBN :
978-1-4244-2216-6
Electronic_ISBN :
978-1-4244-1827-5
DOI :
10.1109/ICUWB.2008.4653342
