Design of threshold dominant delay Physical Unclonable Functions in 65nm CMOS

Physical Unclonable Functions (PUFs) exploits static process variation across integrated circuits in the manufacturing processes to generate many unique, random and unclonable security keys. In this paper, a threshold dominant delay PUFs (TDD-PUFs) is designed in TSMC 65nm CMOS technology. After configuring the nMOSFET and pMOSFET dominant delay, TDD-PUFs updates the key without physically replace. N stages threshold dominant delay cell, arbiter and other circuits are organized to realize TDD-PUFs. In custom designed, the layout of 128-bit TDD-PUFs occupies 358.62μm×154.65μm. Experimental results show that the randomness is about 100% over a range of environmental variations.