Patent attributes
A current-mode PUF circuit based on a reference current source comprises an input register, the reference current source, a deviation current comparator and a timing controller. The input register is used for ensuring synchronization of the input challenges to avoid influences of asynchronous challenges on output responses. The reference current source generates a reference current for temperature and voltage compensation. A deviation current source array generates two paths of deviation currents under the control of the input challenges. The deviation current comparator generates and outputs a judgement according to the magnitude of the current provided by the deviation current source array. The timing controller is used for generating timing information for operation of the PUF circuit. The invention has the following advantages: the deviation current source array outputs deviation currents with high robustness and high reliability. Simulation results show that the PUF circuit of the invention has good uniqueness and high reliability of 99.6% when operating under difference temperatures (−40˜120° C.) and different voltages (1.08˜1.32V).
