A Body Bias Generator with Low Supply Voltage for Within-Die Variability Compensation

Abstract

SUMMARY A body bias generator (BBG) for fine-grained body biasing (FGBB) is proposed. The FGBB is effective to reduce variability and power consumption in a system-on-chip (SoC). Since FGBB needs a number of BBGs, the BBG is preferred to be implemented in cell-based design procedure. In the cell-based design, it is inefficient to provide an extra supply voltage for BBGs. We invented a BBG with switched capacitor configuration and it enables BBG to operate with wide range of the supply voltage from 0. 6V to 1.2 V. We fabricated the BBG in a 65 nm CMOS process to control 0. 1m m 2 of core circuit with the area overhead of 1.4%