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Ultra-dynamic Voltage scaling (UDVS) using sub-threshold operation and local Voltage dithering

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2 Author(s)
Calhoun, B.H. ; Massachusetts Inst. of Technol., Cambridge, MA, USA ; Chandrakasan, A.P.

Local voltage dithering provides near optimum savings when workload varies for fine-grained blocks. Combining this approach with sub-threshold operation permits ultra-dynamic voltage scaling from 1.1 V to below 300 mV for a 90-nm test chip. Operating at 330 mV provides minimum energy per cycle at 9× less energy than ideal shutdown for reduced performance scenarios. Measurements from the test chip characterize the impact of temperature on the minimum energy point.

Published in:

Solid-State Circuits, IEEE Journal of  (Volume:41 ,  Issue: 1 )