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Development of low phase noise digitally controlled CMOS ring oscillator with quadrature outputs
Author(s) -
Nugroho Prapto,
Pokharel Ramesh K.,
Anand Awinash,
Tomar Abishek,
Kanaya Haruichi,
Yoshida Keiji
Publication year - 2012
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.26824
Subject(s) - phase noise , ring oscillator , dbc , digitally controlled oscillator , cmos , quadrature (astronomy) , microwave , electronic engineering , swing , electrical engineering , offset (computer science) , engineering , vackář oscillator , local oscillator , physics , computer science , acoustics , telecommunications , programming language
This article present a development of low phase noise 14‐bit digitally controlled oscillator (DCO) based on ring oscillator with quadrature output in 0.18‐μm CMOS technology. Proposed design use digital control and feed‐forward technique to obtain wider output swing and stable quadrature output on even number of stages respectively. Designed DCO has tuning frequency range from 212 MHz to 1 GHz. Phase noise at 1‐MHz frequency offset is −123.93 dBc/Hz, which is the lowest among the recently published result. © 2012 Wiley Periodicals, Inc. Microwave Opt Technol Lett 54:1479–1483, 2012; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.26824