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Design Considerations in Tapped-Inductor Fourth-Order Dual-Band VCO

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3 Author(s)
Broussev, S.S. ; Dept. of Commun. Eng., Tampere Univ. of Technol., Tampere, Finland ; Uzunov, I.S. ; Tchamov, N.T.

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.

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Circuits and Systems II: Express Briefs, IEEE Transactions on  (Volume:59 ,  Issue: 1 )