Low power and high performance sram design using bank-based selective forward body bi
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computer science crazy
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21-10-2009, 08:37 PM


Leakage power consumption is large fraction of the total power consumption in contemporary VLSI designs. Since memories occupy a large portion of the total area of many high-performance ICs, it is crucial to reduce the leakage energy of memories. This problem is particularly aggravated for memories implemented in the 45nm technology node, since these processes exhibit significantly higher leakage power. For these memories, leakage is a significant problem not only from a power point of view, but also from performance degradation standpoint. quantify this problem and provide a solution, using a 512KByte SRAM implemented in a 45nm bulk process as a design example. We show that implementing the SRAM as a monolithic memory results in increased delay as well as power. We illustrate a methodology to optimally reduce leakage power and improve performance in memories by splitting the memory array into word line groups (WLGs) which are selectively forward body biased when accessed. We present a derivation of optimal number of WLGs and the forward body bias voltage value, and show that our approach results in a 9:2% access time reduction, and a 53:4% reduction in power during a read operation. Our approach also achieves an 18% reduction in power during a write operation and a 69% leakage power improvement. The area overhead of our scheme is 7:2% compared to a monolithic memory.
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