Chingwei Yeh

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This paper presents a discussion of methods to solve multiple way partitioning problems under three different objective functions. A multicommodity flow fzeatmertt is proposed for partitioning without a size wmstrain~ and an iterative improvement algorithm is proposed for partitioning with a size comt.rstint. This algoriti incorporates a top-down clustering(More)
Gate-level voltage scaling is an approach that allows different supply voltages for different gates in order to achieve power reduction. Previous researches focused on determining the voltage level for each gate and ascertaining the power saving capability of the approach via logic-level power estimation. In this paper, we present the layout techniques that(More)
The advent of portable and high-density devices has made power consumption a critical design concern. In this paper, we address the problem of reducing power consumption via gate-level voltage scaling for those designs that are not under the strictest timing budget. We first use a maximum-weighted independent set formulation for voltage reduction on(More)
—A low-power high-SFDR CMOS direct digital frequency synthesizer (DDFS) is presented. Several design techniques, including a cell-based lookup table, a power aware parameters selection method, a reduced multiplier, a speeded-up adder/subtracter, an extra pipeline stage, and supply voltage scaling, are used to make the design more easily synthesizable and(More)
Circuit clustering plays a fundamental role in hierarchical designs. identifying strongly connected components in the circuits can significantly reduce the complexity of the design and improve the performance of the design process. However, there hm not been a clear objective function for circuit clustering. In this paper, we present a new clustering metric(More)
Power Gating is effective for reducing leakage power. Previously, a Distributed Sleep Transistor Network (DSTN) was proposed to reduce the sleep transistor area by connecting all the virtual ground lines together to minimize the Maximum Instantaneous Current (MIC) through sleep transistors. In this paper, we propose a new methodology for determining the(More)
Aggressive voltage scaling to 0.5V and below is gaining attention due to the interest of using solar cells for portable systems. Static swapped-body biasing [1] and ultra-dynamic voltage scaling (UDVS) [2] are two representative designs in this respect. However, neither of them offers comprehensive treatment of the related design problems. This paper(More)