DocumentCode :
1233680
Title :
Finding the Tuning Curve of a CMOS—LC VCO
Author :
Buonomo, Antonio ; Schiavo, Alessandro Lo
Author_Institution :
Dipt. di Ing. dell´´Inf., Seconda Univ. degli Studi di Napoli, Aversa
Volume :
55
Issue :
9
fYear :
2008
Firstpage :
887
Lastpage :
891
Abstract :
A nonlinear perturbation model of a complementary LC-tuned voltage-controlled oscillator is derived, which consists of two mutually-coupled second-order differential equations. The first-order approximate periodic solution of the describing equations is found, obtaining closed-form expressions for both the amplitude and the harmonics of oscillation, as well as for the correction of the oscillation frequency due to the nonlinear effect of varactors. This allows us to find the tuning curve in explicit form. The accuracy of presented formulas was validated by circuit simulations.
Keywords :
CMOS analogue integrated circuits; approximation theory; circuit tuning; differential equations; perturbation techniques; varactors; voltage-controlled oscillators; CMOS-LC VCO; circuit simulations; first-order approximate periodic solution; mutually-coupled second-order differential equations; nonlinear perturbation model; oscillation frequency correction; tuning curve; varactors; voltage-controlled oscillator; Analog integrated circuits; nonlinear analysis; oscillators; sensitivity analysis; tuning curve; varactors; voltage-controlled oscillators (VCOs);
fLanguage :
English
Journal_Title :
Circuits and Systems II: Express Briefs, IEEE Transactions on
Publisher :
ieee
ISSN :
1549-7747
Type :
jour
DOI :
10.1109/TCSII.2008.923422
Filename :
4530754
Link To Document :
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