A double tuned Ku-band SiGe-MMIC VCO with variable feed-back capacitor
- 1 December 2006
- conference paper
- Published by Institute of Electrical and Electronics Engineers (IEEE)
- No. 21654727,p. 1118-1127
- https://doi.org/10.1109/apmc.2006.4429605
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
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