| 摘要 |
A voltage island system including a hot-switchable voltage bus for IDDQ current measurements. The voltage island system includes a plurality of voltage islands (V 1 , V 2 , . . . , Vn), a global power system, and a quiescent power system. The global power system includes a plurality of on-chip global header devices (H 1 , H 2 , . . . , Hn) for selectively providing a voltage VDDg to the plurality of voltage islands in response to global header control signals (x 1 , x 2 , . . . , xn), respectively. A global VDDg power supply provides power to the global header devices (H 1 , H 2 , . . . , Hn) via a VDDg power distribution grid/bus. The quiescent power system includes a plurality of on-chip quiescent header devices (H 1 q, H 2 q, . . . , Hnq) for selectively providing a quiescent voltage VDDq to the plurality of voltage islands in response to quiescent header control signals x 1 q, x 2 q, . . . , xnq, respectively. A quiescent VDDq power supply provides power to the quiescent header devices via a VDDq power distribution grid/bus.
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