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VTH-hopping scheme to reduce subthreshold leakage for low-power processors

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5 Author(s)
Nose, K. ; Inst. of Ind. Sci., Univ. of Tokyo, Japan ; Hirabayashi, M. ; Kawaguchi, H. ; Seongsoo Lee
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In order to suppress the power consumption in low-voltage processors, a threshold voltage hopping (VTH-hopping) scheme is proposed where the threshold voltage is dynamically controlled through software depending on a workload. VTH-hopping is shown to reduce the power to 18 % of the fixed low-threshold voltage circuits in 0.5-V supply voltage regime for multimedia applications. A positive back-gate bias scheme with VTH-hopping is presented for the high-performance and low-voltage processors. In order to verify the effectiveness of VTH-hopping, a small-scale RISC processor with VTH-hopping capability and the positive back-gate bias scheme is fabricated in a 0.6-μm CMOS technology. MPEG4 encoding is simulated based on the measured data. The result shows that 86% power saving can be achieved by using VTH-hopping compared with the fixed positive back-gate bias scheme

Published in:

Solid-State Circuits, IEEE Journal of  (Volume:37 ,  Issue: 3 )

Date of Publication:

Mar 2002

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