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

fYear

2006

fDate

12-15 Dec. 2006

Firstpage

1118

Lastpage

1127

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);

fLanguage

English

Publisher

ieee

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

Type

conf

DOI

10.1109/APMC.2006.4429605

Filename

4429605