Precharge Node based Variable Forward Body Bias for Low-Energy LSIs

Energy efficient LSI is becoming increasingly crucial for battery operated embedded portable applications. To reduce energy per transition and to improve performance for ultra-low voltage circuits, we proposed internal variable forward body bias technique for precharge-evaluate based logic circuits. In the proposed scheme, the forward body bias is applied to high threshold voltage of either the pull-up or the pull-down logic network based on the evaluation transitions. To validate the proposed scheme, simulation results using dual-threshold voltage precharge-evaluate circuits in an industrial 130 nm triple well process technology are discussed.