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Switching regulator with dynamically adjustable supply voltage for low power VLSI

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2 Author(s)
S. Dhar ; Dept. of Electr. & Comput. Eng., Colorado Univ., Boulder, CO, USA ; D. Maksimovic

The paper describes a switching regulator system for adaptive voltage scaling (AVS) where the supply voltage to a digital VLSI chip is dynamically adjusted to the minimum value required for the desired system speed. The control loop includes a variable-frequency Watkins-Johnson switching DC-DC converter and a model of the critical path delay of the application. Simple bang-bang control of the critical path delay allows fast transient response to step changes in speed, and stable operation over a very wide range of system clock frequencies. A chip including the AVS controller and a small digital application has been fabricated in a standard CMOS process. Experimental results demonstrate operation over the application clock frequency range from 10 kHz to 20 MHz, and a 12 μs transient response for a step change in speed from standby to maximum throughput operation

Published in:

Industrial Electronics Society, 2001. IECON '01. The 27th Annual Conference of the IEEE  (Volume:3 )

Date of Conference: