Tamper Resistant Reconfigurable Preamplifier Physical Unclonable Function With Self-Destruct

A reconfigurable preamplifier physical unclonable function (Pre-Amp PUF) is designed to support multiple challenge–response pairs per bitcell with zero array area impact. A novel addressing scheme executed on balanced pull-up and pull-down networks of the bitcell allow for reconfigurability of the PUF key and obfuscation of the data located within the chip. The Pre-Amp PUF bitcell is uniquely situated to replace other array-based PUF designs through improved hardware security and resistance to reverse engineering using imaging. Data is sensed using tens of millivolts of differential signal and remains valid only when a bitcell is selected for a read operation.