As the fabrication technology migrated towards the nanometre scale, 22 nm and beyond,
yield enhancement has become one of the challenges facing the integrated circuits design
community. Delay and power consumption of the manufactured chips deviate from their
predesigned values due to process, voltage and temperature (PVT) variations. This
deviation can lead to a considerable loss in yield and reliability. In this paper, we classify
and survey the approaches developed to mitigate the PVT variations on the circuit and ...