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首页> 外文期刊>Journal of Low Power Electronics >Hybrid Subthreshold and Nearthreshold Design Methodology for Energy Minimization
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Hybrid Subthreshold and Nearthreshold Design Methodology for Energy Minimization

机译：能量最小化的混合阈值和近阈值设计方法

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With the rapid growth in the use of portable electronic devices, more emphasis has recently been placed on low-energy circuit design. Digital subthreshold and nearthreshold CMOS circuit designs offer significant energy savings by operating at a reduced power supply voltage. However, these energy savings come at a critical cost to performance, restricting their use to severely energy-constrained applications. This paper presents a hybrid methodology that integrates characterized nearthreshold and subthreshold standard cells into high-performance functional modules. Within these functional modules, energy minimization is achieved while satisfying performance constraints by replacing non-critical path logic with nearthreshold and subthreshold logic cells. Specifically, the critical path method is used to bind the timing and energy constraints of the design. The design methodology was verified and tested with several benchmarks, including a cryptographic hash function, Skein. An average energy savings of 41.15% was observed at a circuit performance degradation factor of 10. The energy overhead of the level shifters accounted for at least 8.5% of the optimized circuit energy, with an average energy overhead of 26.76%. A heuristic approach for estimating the energy savings of the optimized design is also presented.
机译：随着便携式电子设备的使用的快速增长，近来更多的重点放在低能耗电路设计上。数字亚阈值和近阈值CMOS电路设计通过在降低的电源电压下工作，可显着节省能源。但是，这些节能措施对性能造成了重大损失，从而限制了它们在严格限制能源消耗的应用中的使用。本文提出了一种混合方法，将特征化的近阈值和亚阈值标准单元集成到高性能功能模块中。在这些功能模块内，通过用近阈值和亚阈值逻辑单元替换非关键路径逻辑，在满足性能约束的同时实现了能量的最小化。具体而言，关键路径方法用于约束设计的时序和能量约束。设计方法论已通过多个基准进行了验证和测试，包括加密哈希函数Skein。在电路性能下降因数为10时，平均节能量为41.15％。电平转换器的能量开销至少占优化电路能量的8.5％，平均能量开销为26.76％。还提出了一种启发式方法，用于估算优化设计的节能量。

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