Abstract-This paper investigates the impact of power gating structure on power supply noise using 65nm test chip measurement and simulation. We focus on the body connection of power-gated circuits, and examine the contribution of a powergated circuit as a decoupling capacitance during the sleep mode. Experimental results show that the well junction capacitance of the power-gated circuit with body-tied structure helps reduce power supply noise while a sharp drop cannot be mitigated due to its large RC time constant.

Abstract-This paper investigates power gating implementations that mitigate power supply noise. We focus on the body connection of power-gated circuits, and examine the amount of power supply noise induced by power-on rush current and the contribution of a power-gated circuit as a decoupling capacitance during the sleep mode. To figure out the best implementation, we designed and fabricated a test chip in 65nm process. Experimental results with measurement and simulation reveal that the power-gated circuit with body-tied structure in triple-well is the best implementation from the following three points; power supply noise due to rush current, the contribution of decoupling capacitance during the sleep mode and the leakage reduction thanks to power gating.

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This paper presents measurement results of on-chip noise on power and ground rings for I/O (input/output) cells in a simple test structure fabricated in 90nm process. We also show measured timings of an output signal from chip to PCB board, and examine the relation between the magnitude of I/O power supply noise and the output transition timings.