A 400μW, 4.7–6.4GHz VCO under an above-IC inductor in 45nm CMOS
2008
A 4.7-to-6.4 GHz VCO is designed in 45 nm bulk CMOS using an above-IC inductor on top of the active circuitry, yielding 28% area reduction. The inductor is shielded from the circuitry, using the top metal layers of the CMOS back- end, which enables the proposed 3D integration for low-cost performance extension. The fully integrated VCO consumes just 400 muW, achieves a FoM of 185 dB, and occupies and area of only 0.12 mm 2 .
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