A 3.07μm2/bitcell physically unclonable function with 3.5% and 1% bit-instability across 0 to 80°C and 0.6 to 1.2V in a 65nm CMOS

This paper presents a circuitry for physically unclonable function, generating a unique and stable key for security-oriented applications. The key is generated from an array of pairs of voltage-compensated proportional-to-absolute-temperature generators. The difference between two analog outputs of a pair is voltage- and temperature-compensated yet sensitive mostly only to random threshold-voltage variation. As compared to the state of the art [3-4], the proposed design has an 8.3× smaller bitcell or 3.66× higher robustness against noise and environmental variations.