A 1V Dual-Band VCO Using an Integrated Variable Inductor

Abstract

An integrated variable inductor is proposed using an on-chip transformer to obtain 2 inherent resonant modes for band-switching applications. Employing such a variable inductor in a 0.18-mum CMOS process at a 1-V supply, a VCO is demonstrated to oscillate in 2 distinct frequency bands from 2.2 GHz to 3.6 GHz and from 10.7 GHz to 11.3 GHz. The VCO measures… (More)

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