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A CMOS quadrature voltage‐controlled oscillators using common‐drain coupling transistors
Author(s) -
Jang ShengLyang,
Liu YouWei,
Chang ChiaWei,
Juang MiinHorng
Publication year - 2013
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.27578
Subject(s) - dbc , phase noise , voltage controlled oscillator , electrical engineering , cmos , transistor , nmos logic , figure of merit , voltage , microwave , engineering , optoelectronics , materials science , electronic engineering , physics , telecommunications
This article presents a fully integrated quadrature cross‐coupled voltage controlled oscillator (QVCO) using common‐drain transistor instead of common‐source transistor as a coupling device.The prototype 3.8 GHz QVCO in 0.18 μm CMOS process is proposed to generate four output phases and it uses two p‐core cross‐coupled VCOs and nMOS coupling devices. The proposed QVCO oscillates from 3.6 to 3.84 GHz and the power consumption is 7.24 mW at 0.74 V supply voltage. The measured phase noise is –126.19 dBc/Hz at 1 MHz offset frequency from the carrier frequency 3.745 GHz. The VCO occupies a chip area of 1.08 ×0.924 mm 2 and provides a figure of merit of –189.05 dBc/Hz. © 2013 Wiley Periodicals, Inc. Microwave Opt Technol Lett 55:1262–1266, 2013; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.27578