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Fast voltage control scheme with adaptive voltage control steps and temporary reference voltage overshoots for dynamic voltage and frequency scaling

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4 Author(s)
Ikenaga, Y. ; LSI Fundamental Res. Lab., NEC Electron. Corp., Sagamihara ; Nomura, M. ; Nakazawa, Y. ; Hayashi, Y.

We have developed a voltage control scheme to reduce control time using a delay monitor and step-by-step supply-voltage control. With this scheme, voltage control steps are adaptively controlled, and there are temporary overshoots in the reference voltage. Experimental results with a 65-nm CMOS device indicate that the adaptive voltage control steps successfully reduce the voltage control time by about 35 % over that with fixed step. Simulation results indicate that temporary reference voltage overshoots reduce control time by more than 50%. The combination of these schemes is also effective for control time reduction.

Published in:

Solid-State Circuits Conference, 2008. A-SSCC '08. IEEE Asian

Date of Conference:

3-5 Nov. 2008