X-band low phase noise quadrature CMOS VCO with transformer feedback

Yu-Shun Liao, Christina Jou

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

1 Scopus citations


A fully integrated quadrature VCO with transformer feedback is proposed to achieve low-phase-noise and at a x-band using a TSMC 0.18-mu m CMOS technology. The VCO is implemented using a transformer-based LC tank and the transformer feedback configuration from the drain to the back-gate of the switching transistors. The simulation result shows the phase noise is about -114dBc/Hz at 1MHz offset and the output frequency tuning range of the QVCO is around 800 MHz ranging from 8.9 to 9.7 GHz. The QVCO core circuit draws only 4.1 mA from a 1.5-V supply. Compared with the recent works, the proposed QVCO topology shows phase noise performance 5 dBc/Hz lower than the original and power consumption of 6.15 mW compared to the original VCO core of 6.8 mW.
Original languageEnglish
Title of host publicationProgress in Electromagnetics Research Symposium (PIERS 2008)
Number of pages4
StatePublished - 2008

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