Tuning Vth Hopping for Aggressive Runtime Leakage Control
The continuous increase of leakage power consumption in deep sub-micro technologies necessitates more aggressive leakage control. Runtime leakage control (RTLC) is effective, since runtime circuits generally have significant amount of idleness. However, current RTLC techniques are only used when circuits have long idleness, rendering the techniques less profitable. The reason is due to the large energy and delay overhead when performing RTLC mode transition. We propose two novel techniques, workload-adaptive Vth hopping (WAVTH) and hierarchical Vth hopping (HIVTH), to tackle the overhead problems and enable aggressive runtime leakage control. Experimental results show 19.2% average improvement on leakage saving with WAVTH and HIVTH over basic Vth hopping. The optimum design points of these two techniques are determined through accurate modeling.
Keywords: BODY BIASING; ENERGY OVERHEAD; LEAKAGE CONTROL; VTH HOPPING; WAKEUP DELAY
Document Type: Research Article
Publication date: 01 October 2010
- The electronic systems that can operate with very low power are of great technological interest. The growing research activity in the field of low power electronics requires a forum for rapid dissemination of important results: Journal of Low Power Electronics (JOLPE) is that international forum which offers scientists and engineers timely, peer-reviewed research in this field.
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