Back-Gate Coupled Current-Reused QVCO with Modified STM Technique

Po-Ju Chiu, Kuan-I Wu, Christina Jou

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


In order to achieve low power consumption, many improved VCO schematics were proposed. However, although the problem of power consumption has been improved, the amplitude imbalance of the output signals is relatively larger than the conventional cross-coupled VCO. Therefore, a new modified STM technique to improve the amplitude imbalance of VCO is presented. The measured amplitude imbalance ratio is less than 0.2%. It reduces from 1.7% of the VCO without modified STM technique. This back-gate coupled current-reused QVCO has been implemented using the TSMC 0.18um mixed signal/RF CMOS IP6M technology and the die area is 0.84x1.1mm(2). The measured phase noise at 1MHz offset is 117.4dBc/Hz at the oscillation frequency of 5.0 GHz. The figure of merit (FOM) of the proposed QVCO is -184.1 dBc/Hz.
Original languageEnglish
Title of host publication2010 ASIA-PACIFIC MICROWAVE CONFERENCE
Number of pages4
ISBN (Print)978-4-902339-22-2
StatePublished - 2010
Event22nd Asia-Pacific Microwave Conference (APMC) - Yokohama, Japan
Duration: 7 Dec 201010 Dec 2010

Publication series

NameAsia Pacific Microwave Conference-Proceedings


Conference22nd Asia-Pacific Microwave Conference (APMC)
City Yokohama


  • CMOS integrated circuits; current-reused; modified STM technique; quadrature VCO (QVCO); radio frequency (RF)

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