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A CMOS multiphase shifting network with RC‐CR filter and bias‐level‐scaled active interpolator
Author(s) -
Lee MiYoung,
Yoo Changsik
Publication year - 2007
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.22033
Subject(s) - cmos , local oscillator , amplitude , microwave , electrical engineering , electronic engineering , phase (matter) , filter (signal processing) , physics , engineering , telecommunications , phase noise , optics , quantum mechanics
A CMOS multiphase shifting network is described, which is developed for the use in a subharmonic mixing based direct‐conversion receiver of 5–6 GHz wireless LAN. Accurate phase shift and amplitude matching are simultaneously achieved with a third‐order RC–CR filter followed by the active interpolators whose bias levels are scaled for accurate phase shift. Implemented in a 0.18 μm CMOS process, the phase shifting network provides octa‐phase local oscillator (LO) signals spaced by 45°. The measured accuracy of the phase shift and amplitude matching are better than 0.8° and 0.4%, respectively. The phase shifting network excluding LO buffers dissipates 13 mW from a 1.8 V supply voltage. © 2006 Wiley Periodicals, Inc. Microwave Opt Technol Lett 49: 118–121, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.22033