A fast, flexible, positive and negative adaptive body-bias generator in 28nm FDSOI

Abstract

This work demonstrates a fully-integrated, compact body-bias generator (BBG) with a fine voltage step and sub-100ns response time for use in process and voltage compensation as well as dynamic energy optimization. The generator is implemented in 28nm UTBB FDSOI, using only 1.0V core and 1.8V IO voltage inputs. A modular design enables easy integration into target mobile SoCs, scalable to power domains of any size. The fine resolution (5mV Vth), 100ns full-scale and 5ns incremental step response, low power (<;10μW), and 1.2% area overhead enable fine-grained adaptive body-biasing (ABB). The ability to dynamically track a target frequency within 1% for 200mV of VCORE change is demonstrated experimentally.