Feedback-Based E-E AMP Chain for Enhanced PUF Entropy Generation

In this work, a feedback-based choke flow enhancement amplifier (E-E AMP) chain structure is proposed as a source of entropy for the PUF circuit. The non-reproducibility of the E-E AMP is utilized to allow the entropy characteristics to be nonlinearly transmitted and balanced at each stage of the chain's impact on the PUF output. In addition, the feedback connection allows the entropy signal to be iterated multiple times in the chain, providing strong resistance to machine learning attacks.