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Low‐voltage/low‐power 7‐GH Z transformer‐coupled current‐reused CMOS QVCO with wide tuning range
Author(s) -
Tseng YanRu,
Huang TzuenHsi,
Wu ShangHsun
Publication year - 2010
Publication title -
microwave and optical technology letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.304
H-Index - 76
eISSN - 1098-2760
pISSN - 0895-2477
DOI - 10.1002/mop.25058
Subject(s) - cmos , dbc , electrical engineering , phase noise , figure of merit , transformer , voltage , power consumption , inductor , microwave , offset (computer science) , q factor , low voltage , engineering , materials science , optoelectronics , physics , power (physics) , telecommunications , computer science , quantum mechanics , resonator , programming language
In this article, we report the design of a transformer‐coupled current‐reused quadrature voltage‐controlled oscillator (QVCO) having low‐voltage operation, low‐power consumption, and a wide tuning range.An improved trifilar transformer that is fabricated by symmetrically interlacing two half circle secondary coils between the turns of the primary coil is proposed to provide a higher magnetic coupling factor. A QVCO integrated with such a trifilar transformer is implemented using 0.18‐μm RF CMOS technology. When the QVCO is operated at a supply voltage of 1V at 7.263 GHz, the measured phase noise is −111.4 dBc/Hz at a 1‐MHz offset. Further, the QVCO core draws only 1.58 mW. The total tuning range is ∼510 MHz over the whole tuning range (from 0 to 1.8 V). The calculated figure of merit is 186.6 dB and the power‐frequency‐tuning‐normalized factor is −9.4 dB. As compared to the reported data in a previous study, a 28.2% reduction in power consumption and a 54.5% increase in tuning range can be achieved. © 2010 Wiley Periodicals, Inc. Microwave Opt Technol Lett 52:797–801, 2010; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.25058