Analysis and reduction of SRAM PUF Bit Error Rate

Reducing BER (Bit Error Rate) is a crucial problem for a PUF (Physical Unclonable Function) in the security application. In this paper, BER is analyzed focusing on two major factors: mismatch factor and noise. By comparing five SRAM PUFs with different transistor sizes, weight factor of load pMOS and driver nMOS that determines the mismatch is extracted. And it is shown that BER can be reduced by unbalancing the pMOS/nMOS transistor size ratio.