Premium
A low power X‐band CMOS differential VCO
Author(s) -
Jang ShengLyang,
Huang S.S.,
Wu ShengChien,
Lee ChienFeng,
Juang M.H.
Publication year - 2008
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.23388
Subject(s) - voltage controlled oscillator , colpitts oscillator , phase noise , dbc , electrical engineering , cmos , varicap , microwave , inductor , voltage , transistor , pmos logic , transformer , materials science , engineering , optoelectronics , physics , vackář oscillator , telecommunications , capacitance , electrode , quantum mechanics
This article proposes a 12 GHz low power differential voltage‐controlled oscillator (VCO) based on single‐ended Colpitts oscillators. The differential VCO uses two single‐ended Colpitts VCOs coupled by a pair of pMOS cross‐coupled transistors and a transformer inductor. The differential VCO was fabricated in the TSMC 0.18‐nm CMOS process, it oscillates from 11.46 GHz to 12.45 GHz, and the power consumption is 2.76 mW at the supply voltage of 1.2 V. The measured phase noise at 1‐MHz offset is g110.95 dBc/Hz at the oscillation frequency of 12.42 GHz. The power consumption of the VCO is 2.3 mA when the supplied voltage is 1.2 V. The figure of merit of the VCO is −188.43 dBc/Hz. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 1389–1392, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23388