Fractal capacitors

Abstract

This paper introduces a high-density linear capacitor structure with low bottom-plate parasitics. The density of such a structure improves as process technologies scale. Fractal capacitors retain the linearity of metal-to-metal capacitors with limited degradation of Q. The structures automatically limit the length of the thin metal sections to a few microns, keeping the series resistance reasonably small. Another advantage is the reduction of bottom-plate capacitance because of the smaller area.

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