Crosstalk minimization in deep submicron technologies using bus coding.
Item
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Title
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Crosstalk minimization in deep submicron technologies using bus coding.
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Identifier
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AAI3289463
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identifier
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3289463
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Creator
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Elkammar, Ahmed Nassar.
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Contributor
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Adviser: Norman Scheinberg
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Date
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2007
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Language
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English
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Publisher
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City University of New York.
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Subject
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Engineering, Electronics and Electrical
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Abstract
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Interconnect is a major bottleneck for deep submicron technologies (DSM) in the years to come. This dissertation addresses the signal transmission aspect from a crosstalk, power dissipation, and transmission speed perspective.;As the CMOS technology enters the deep submicrometer range the lateral inter-wire coupling capacitance that causes crosstalk becomes the dominant part of the load capacitance. This effect is more significant on interconnect wires that are adjacent to each other for long routing distances on the integrated circuit such as bus structures. This makes crosstalk noise, power consumption, and propagation delay on these bus structures highly data-pattern dependent. Crosstalk induced delay and noise became an important design limiter in DSM geometries. Power consumption has become a critical design concern in recent years driven by the emergence of widely used mobile applications. Crosstalk effects play a significant role in the power dissipation in interconnects. Although the power consumption of a system can be reduced at various phases of the design process from system level down to process level, optimization at a higher level can often provide more power savings.;This dissertation presents general purpose bus coding techniques that minimizes opposite transitions (correlated switching) and self transition switching activity, and increase the number of silent transitions (wires that maintain their electrical state), on the data transmitted over bus wires. Eliminating correlated switchings prevents peak crosstalk noise between the wires of the buses, which have very high coupling capacitances. The continuous scaling down of supply voltage led to shrinking noise margins. Therefore, the elimination of peak crosstalk noise between bus wires is vital for circuit design reliability. It can also increase the data transmission rate significantly. Because of the overall crosstalk minimization, the power consumption is also reduced.;A large number of encoding techniques have been presented in literature to address correlated switchings that causes peak crosstalk. A new closed formula has been developed to exactly calculate the reduction in the total number of correlated switching produced by each encoding technique. Also a comparison between different coding techniques and our techniques in terms of power dissipation is presented. It shows that our techniques are more power efficient as the coupling capacitance to self capacitance ratio increase.
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Type
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dissertation
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Source
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PQT Legacy Restricted.xlsx
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degree
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Ph.D.