Title :
Design Considerations in Tapped-Inductor Fourth-Order Dual-Band VCO
Author :
Broussev, Svetozar S. ; Uzunov, Ivan S. ; Tchamov, Nikolay T.
Author_Institution :
Dept. of Commun. Eng., Tampere Univ. of Technol., Tampere, Finland
Abstract :
A theoretical analysis of the constraints posed by a tapped inductor on a dual-band fourth-order voltage-controlled oscillator (VCO) is presented. The analysis provides guidelines for frequency band selection, tapped-inductor design, and VCO optimization. The guidelines are utilized in a VCO design example simulated on a 45-nm CMOS process. An adaptive frequency-tuning scheme exploits unique features of the fourth-order tank to optimize VCO performance.
Keywords :
CMOS integrated circuits; circuit tuning; voltage-controlled oscillators; CMOS process; VCO design; VCO optimization; VCO performance; adaptive frequency-tuning; design consideration; dual-band fourth-order voltage-controlled oscillator; fourth-order tank; frequency band selection; size 45 nm; tapped-inductor fourth-order dual-band VCO; Couplings; Dual band; Inductors; Phase noise; Resonant frequency; Voltage-controlled oscillators; Adaptive frequency tuning; VCO; dual-band voltage-controlled oscillator (VCO); fourth-order resonator; tapped inductor;
Journal_Title :
Circuits and Systems II: Express Briefs, IEEE Transactions on
DOI :
10.1109/TCSII.2011.2177697
