A Low Power Current Mode PUF Based on Winner-Take-All Scheme
Wenhan Zheng, Xiaofang Pan, Xiaojin Zhao · 2019
In this paper, a current mode physical unclonable function (PUF) based on the winner-take-all (WTA) scheme is presented. By using the process variation of the single transistor in the current mirror array, digital values with superior randomness can be produced. With the proposed WTA scheme, the time needed to acquire the currents' difference is significantly reduced. Meanwhile, the overall power consumption is also greatly lowered with the simplified peripheral circuitry. Moreover, unstable bit replacement circuitry is customized to remove the unstable bit caused by WTA's mismatch, which further improves the reliability of our proposed PUF. According to the simulation results using standard 65nm CMOS process, the proposed unstable replacement circuitry can replace up to 12.07% of the unstable bits. In addition, the superior averaged temperature reliability of the proposed implementation is 99.53% from -20° C to 100°C, with the overall power consumption as low as 892nW.