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In this paper, an all-digital ON-chip process sensor using a ratioed inverter-based ring oscillator is proposed. Two types of the ratioed inverter-based ring oscillators, nMOS and pMOS types, are proposed to sense process variation. The nMOS (pMOS)-type ring oscillator is designed to improve its sensitivity to the process variation in the nMOS (pMOS) transistors using the ratioed inverter that consists...
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