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Evaluation and comparison of GHz‐range LC oscillators using time‐varying root‐locus
Author(s) -
Broussev Svetozar S.,
Tchamov Nikolay T.
Publication year - 2013
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.801
Subject(s) - cmos , cadence , topology (electrical circuits) , root locus , network topology , electronic circuit , transceiver , voltage , electronic engineering , locus (genetics) , computer science , control theory (sociology) , engineering , electrical engineering , control system , control (management) , artificial intelligence , operating system , biochemistry , chemistry , gene
SUMMARY This paper presents a comprehensive comparison between complementary metal‐oxide‐semiconductor (CMOS) LC ‐oscillator topologies often used in GHz‐range transceivers. The comparison utilizes the time‐varying root‐locus (TVRL) method to add new insights into the operation of different oscillators. The paper focuses on the treatment of the TVRL trajectories obtained for different oscillators and establishes links between the trajectories and physical phenomena in oscillators. The evaluation of the root trajectories shows the advantages of the TVRL method for comparing oscillator topologies, which is also extended towards the analysis of voltage‐controlled oscillators. The necessary circuit simplifications required in closed‐form root‐locus analysis are avoided by the TVRL, which allows precise oscillator comparison and reveals details on the topology specifics. The derived conclusions have been verified by the Cadence Spectre‐RF simulator on 130‐nm CMOS process. Copyright © 2011 John Wiley & Sons, Ltd.