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Phase error analysis in CMOS injection‐coupled LC quadrature oscillator (IC‐QO)
Author(s) -
Ghonoodi Hojat,
MiarNaimi Hossein
Publication year - 2014
Publication title -
international journal of circuit theory and applications
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.364
H-Index - 52
eISSN - 1097-007X
pISSN - 0098-9886
DOI - 10.1002/cta.1909
Subject(s) - cmos , capacitor , quadrature (astronomy) , oscillation (cell signaling) , error analysis , control theory (sociology) , physics , electronic engineering , voltage , electronic oscillator , current source , lc circuit , electrical engineering , computer science , mathematics , engineering , voltage controlled oscillator , chemistry , biochemistry , control (management) , artificial intelligence
Summary This paper presents a novel approach to study the phase error in source injection coupled quadrature oscillators (QOs). Like other LC QOs, the mismatches between LC tanks are the main source of phase error in this oscillator. The QO is analyzed where the phase error and oscillation frequency are derived in terms of circuit parameters. The proposed analysis shows that the output phase error is a function of injection current and the current of source equivalent capacitor. As a result, it is shown that increasing of tail current and LC tank quality factor decreases the phase error. Derived equations show that the phase error can be cancelled and even controlled by adjusting bias currents. To evaluate the proposed analysis and consequent designed QO, a 5.5 GHz CMOS QO is designed and simulated using the practical 0.18 µm TSMC CMOS technology. The experiments show good agreement between analytical equations and simulation results. Copyright © 2013 John Wiley & Sons, Ltd.