A power gating scheme for ground bounce reduction during mode transition

Power gating is an effective method to reduce leakage power during the circuit sleep mode; however, it introduces the ground bounce problem and has considerable energy consumption during the mode transitions. To mitigate the ground bounce, we propose a novel power gating scheme that reduces the magnitude of the peak current and voltage glitches as well as the time to stabilize power and ground during mode transitions. To further decrease the wakeup time while keep the energy efficiency, we introduce two improved circuit schemes with two intermediate states, based on our proposed power gating scheme. The scheme provides an average peak voltage reduction of 67.0%, and the wakeup time reduction is up to 62.3%. If the circuits use the intermediate schemes, wakeup time can be further reduced by a maximum of 95.7%. Beside these reductions, our proposed circuit scheme also has the advantage of small size and flexible controllability.