Title :
A double tuned Ku-band SiGe-MMIC VCO with variable feed-back capacitor
Author :
Tsutsumi, Koji ; Kagano, Miki ; Suematsu, Noriharu
Author_Institution :
Mitsubishi Electr. Corp., Kamakura
Abstract :
A double tuned Ku-band SiGe-MMIC voltage-controlled oscillator (VCO) with variable feedback capacitor is presented. The proposed VCO employs series varactors in feed-back paths in addition to varactors in tank circuit. By controlling both varactors, this VCO achieves wide tuning range compared to the conventional LC cross-coupled VCO. Furthermore, appropriately biased MOS varactors for feed-back paths realize linear tuning performance. The proposed configuration is experimentally validated with a 0.35 mum SiGe-BiCMOS fully integrated VCO. The oscillation frequency of the fabricated VCO varies 14.3 GHz to 16.2 GHz with 12.5% tuning range, which is increased by 120% from that of the conventional LC cross-coupled VCO.
Keywords :
BiCMOS integrated circuits; Ge-Si alloys; MMIC oscillators; elemental semiconductors; semiconductor materials; voltage-controlled oscillators; BiCMOS; LC cross-coupled VCO; SiGe; biased MOS varactors; cross-coupled VCO; double tuned Ku-band MMIC VCO; frequency 14.3 GHz to 16.2 GHz; series varactors; size 0.35 mum; tank circuit; variable feed-back capacitor; voltage-controlled oscillator; Capacitance; Capacitors; Circuit optimization; Phase noise; Radio frequency; Supercapacitors; Tuned circuits; Tuning; Varactors; Voltage-controlled oscillators; LC oscillator; SiGe-MMIC; double tuned; feed-back path; voltage-controlled oscillator(VCO);
Conference_Titel :
Microwave Conference, 2006. APMC 2006. Asia-Pacific
Conference_Location :
Yokohama
Print_ISBN :
978-4-902339-08-6
Electronic_ISBN :
978-4-902339-11-6
DOI :
10.1109/APMC.2006.4429605
