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Quadrature cross‐coupled VCO implemented with body injection‐locked frequency dividers
Author(s) -
Jang ShengLyang,
Liu ChengChen,
Huang ShinHsin,
Juang MiinHorng
Publication year - 2009
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.24495
Subject(s) - dbc , frequency divider , phase noise , cmos , voltage controlled oscillator , electrical engineering , figure of merit , transistor , voltage , lc circuit , engineering , power consumption , optoelectronics , physics , power (physics) , capacitor , quantum mechanics
This article presents a CMOS quadrature voltage‐controlled oscillator (QVCO). The LC‐tank QVCO consists of two cross‐coupled n MOS divide‐by‐2 injection‐locked frequency divider (ILFDs) with a tail transistor, which serves the role of frequency doubler. The output of the tail transistor in one ILFD is injected to the bodies of the n MOSFETs in the other ILFD. The proposed CMOS QVCO has been implemented with the TSMC 0.18 μm CMOS technology and the die area is 0.595 × 0.896 mm 2 . At the supply voltage of 0.6 V, the total power consumption is 2.4 mW. The free‐running frequency of QVCO is tunable from 5.44 to 5.8 GHz as the tuning voltage is varied from 0.0 to 0.6 V. The measured phase noise at 1 MHz frequency offset is −115.62 dBc/Hz at the oscillation frequency of 5.44 GHz and the figure of merit (FOM) of the proposed QVCO is −186.6 dBc/Hz. © 2009 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 1918–1921, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24495