Temperature behavior mismatch of halo implanted short channel transistors and its influence on PUF circuits

So-called physical unclonable functions (PUFs) are circuits that generate IDs or keys from manufacturing variations. Since the estimation of the error rates of PUFs should already be done during the design phase, Monte Carlo circuit simulations should provide realistic results. Unfortunately, it turns out that the temperature behavior is not covered well in the Monte Carlo parameters if halo implanted transistors are used. In this paper we analyze the influence of halo and substrate doping concentration variations on the temperature behavior of minimum size transistors and suggest an adaptation of the Monte Carlo parameters with respect to this problem. Since temperature depending behavior of transistors is a general issue, the proposed approach is not restricted to PUF circuits.