An Adaptive Body-Biaslna SoC Using in Situ Slack Monitoring for Runtime Replica Calibration

This work proposes a hybrid approach combining the benefits of in situ timing slack monitoring and tunable replica techniques while avoiding their drawbacks (e.g., mistracking, high overhead). In a 55nm technology with strong body bias coefficient, we demonstrate an adaptive Cortex-M0 that is based on an in situ assisted tunable replica circuit and shows tracking error of <2% across [0.5-0.9]V supply and [-40-125]oC, achieving up to 53% energy improvement.