Title :
A technique for truly linear LC VCO tuning, a proof of concept
Author :
Hanafi, Bassel ; Hegazi, Emad
Author_Institution :
Dept. of Electron. & Commun. Eng., Ain Shams Univ., Cairo
Abstract :
Based on the understanding of the relation between the shape of the LC VCO tuning curve and the varactor characteristics, a technique using an array of unequal varactors with different bias was found to obtain a truly linear tuning curve. An LC VCO was designed using TSMC 0.13 mum 1.2V/3.3V IO process, the VCO frequency varies from 2 - 2.34 GHz as its control voltage varies from 0 - 1.2V. The tuning gain was KVCO = 275MHz/Vplusmn6.5%.
Keywords :
UHF oscillators; circuit tuning; varactors; voltage-controlled oscillators; IO process; circuit tuning; frequency 2 GHz to 2.34 GHz; linear LC VCO tuning; linear tuning curve; size 0.13 mum; varactor characteristics; voltage 0 V to 1.2 V; voltage-controlled oscillators; Capacitance-voltage characteristics; Curve fitting; Equations; Frequency synthesizers; Phase locked loops; Tuning; Varactors; Virtual colonoscopy; Voltage control; Voltage-controlled oscillators; Differential LC VCO; tuning curve; varactor;
Conference_Titel :
Microelectronics, 2007. ICM 2007. Internatonal Conference on
Conference_Location :
Cairo
Print_ISBN :
978-1-4244-1846-6
Electronic_ISBN :
978-1-4244-1847-3
DOI :
10.1109/ICM.2007.4497669
