Title :
A new resonant circuit for 2.45 GHz LC VCO with linear frequency tuning
Author :
Zihir, Samet ; Tasdemir, Ferhat ; Dinc, Tolga ; Gurbuz, Yasar
Author_Institution :
Fac. of Eng. & Natural Sci., Sabanci Univ., Istanbul, Turkey
Abstract :
A new MOS varactor bank is proposed to implement a 2.45 Ghz SiGe BiCMOS LC-tank voltage controlled oscillator (VCO) with linear frequency tuning. Compared to a conventional VCO, the proposed technique improves the quality factor of the LC-tank while preserving the linearity of the circuit. Realized in 0.25-nm SiGe BiCMOS technology, VCO exhibits 35% VCO gain (KVCO) variation from 2.29 to 2.66 Ghz with a 16% tuning ratio. The VCO also exhibits a phase noise of -113 dBc/Hz at 1 Mhz offset frequency and consumes 1.7 mA from 1.8 V supply.
Keywords :
BiCMOS integrated circuits; Ge-Si alloys; LC circuits; UHF oscillators; tuning; voltage-controlled oscillators; LC VCO; MOS varactor bank; SiGe; SiGe BiCMOS LC-tank voltage controlled oscillator; VCO gain variation; circuit linearity; frequency 2.45 GHz; linear frequency tuning; quality factor; resonant circuit; size 0.25 mum; Frequency measurement; Noise measurement; Phase noise; Q factor; Tuning; Varactors; Voltage-controlled oscillators;
Conference_Titel :
Microwave Integrated Circuits Conference (EuMIC), 2011 European
Conference_Location :
Manchester
Print_ISBN :
978-1-61284-236-3
