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Power Reduction Techniques in Clock Distribution Networks with Emphasis on LC Resonant Clocking

机译:时钟分配网络中的功耗降低技术,着重于LC谐振时钟

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摘要

In this thesis we propose a set of independent techniques in the overall concept of LC resonant clocking where each technique reduces power consumption and improve system performance. ud Low-power design is becoming a crucial design objective due to the growing demand on portable applications and the increasing difficulties in cooling and heat removal. The clock distribution network delivers the clock signal which acts as a reference to all sequential elements in the synchronous system. The clock distribution network consumes a considerable amount of power in synchronous digital systems. Resonant clocking is an emerging promising technique to reduce the power of the clock network. The inductor used in resonant clocking enables the conversion of the electric energy stored on the clock capacitance to magnetic energy in the inductor and vice versa.ud In this thesis, the concept of the slack in the clock skew has been extended for an LC fully-resonant clock distribution network. This extra slack in comparison to standard clock distribution networks can be used to reduce routing complexity, achieve reduction in wire elongation, total wire length, and power consumption. Simulation results illustrate that by utilizing the proposed approach, an average reduction of 53% in the number of wire elongations and 11% reduction in total wire length can be achieved. ud A dual-edge clocking scheme introduced in the literature to enable the operation of the flip-flop at the rising- and falling edges of the clock has been modified. The interval by which the charging elements in the flip-flop are being switched-on was reduced causing a reduction in power consumption. Simulating the flip-flop in STMicroelectronics 90-nm technology shows correct functionality of the Sense Amplifier flip-flop with a resonant clock signal of 500 MHz and a throughput of 1 GHz under process, voltage, and temperature (PVT) variations. Modeling the resonant system with the proposed flip-flop illustrates that dual-edge compared to single-edge triggering can achieve up to 58% reduction in power consumption when the clock capacitance is the dominating factor. ud The application of low-swing clocking to LC resonant clock distribution network has been investigated on-chip. The proposed low-swing resonant clocking scheme operates with one voltage supply and does not require an additional supply voltage. The Differential Conditional Capturing flip-flop introduced in the literature was modified to operate with a low-swing sinusoidal clock. Low-swing resonant clocking achieved around 5.8% reduction in total power with 5.7% area overhead. Modeling the clock network with the proposed flip-flop illustrates that low-swing clocking can achieve up to 58% reduction in the power consumption of the resonant clock.ud An analytical approach was introduced to estimate the required driver strength in the clock generator. Using the proposed approach early in the design stage reduces area and power overhead by eliminating the need for programmable switches in the driving circuit.ud
机译:在本文中,我们在LC谐振时钟的总体概念中提出了一套独立的技术,其中每种技术都可以降低功耗并提高系统性能。 ud由于对便携式应用的需求不断增加以及冷却和散热的难度不断增加,低功耗设计正成为一项至关重要的设计目标。时钟分配网络提供时钟信号,该时钟信号充当同步系统中所有顺序元素的参考。在同步数字系统中,时钟分配网络消耗大量功率。谐振时钟是一种新兴的有前途的技术,可以降低时钟网络的功耗。谐振时钟中使用的电感器能够将存储在时钟电容中的电能转换为电感器中的磁能,反之亦然。 ud在本文中,时钟偏斜的松弛概念已经扩展到了完整的LC。 -谐振时钟分配网络。与标准时钟分配网络相比,这种额外的松弛度可用于降低布线复杂性,减少导线延伸,总导线长度和功耗。仿真结果表明,通过使用所提出的方法,可以平均减少53%的导线延伸次数,并减少11%的总导线长度。文献中介绍了一种双沿时钟方案,该方案使触发器能够在时钟的上升沿和下降沿进行操作。触发器中的充电元件被接通的间隔减小,从而导致功耗的减小。在意法半导体(STMicroelectronics)的90纳米技术中对触发器进行仿真,可以显示Sense Amplifier触发器的正确​​功能,其谐振时钟信号为500 MHz,并且在工艺,电压和温度(PVT)变化的情况下吞吐量为1 GHz。用提出的触发器对谐振系统进行建模表明,与单边沿触发相比,双边沿可以在时钟电容为主要因素时实现高达58%的功耗降低。在芯片上已经研究了低摆幅时钟在LC谐振时钟分配网络中的应用。拟议的低摆幅谐振时钟方案采用一个电源供电,不需要额外的电源电压。文献中介绍的差分条件捕获触发器经过修改,可与低摆正弦时钟一起工作。低摆幅谐振时钟使总功率减少了约5.8%,而面积开销却减少了5.7%。使用所提出的触发器对时钟网络进行建模表明,低摆幅时钟可以使谐振时钟的功耗降低多达58%。 ud引入了一种分析方法来估算时钟发生器中所需的驱动器强度。在设计阶段的早期使用建议的方法,因为不需要驱动电路中的可编程开关,从而减少了面积并降低了功耗。

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