共查询到18条相似文献,搜索用时 171 毫秒
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基于"有效电容"的概念提出了一种分析两相邻耦合RC互连延时的方法.与采用Miller电容的传统方法比较,该方法不但提高了计算精度而且反映出了延时随信号上升时间的变化规律.该方法与Elmore延时法具有相同的计算复杂度,可广泛用于考虑耦合电容的面向性能的布线优化. 相似文献
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考虑了三维异质集成系统中不同衬底层对通孔产生的寄生效应,分别提出了应用于单个和一对差分异质互连通孔的宽频带等效电路模型.在所提出的模型中,Csub和Gsub分别表征衬底耦合效应,Lm、Cm和Gm分别表征两个通孔之间的耦合效应.通过验证,模型在150 GHz频带范围内都具有较高的精度.基于所提出的模型,对单个和一对差分互... 相似文献
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This paper presents an improved figure-of-merit (FOM) for CMOS performance which includes the effect of gate resistance. Performance degradation due to resistive polysilicon gates is modeled as an additional delay proportional to the RC product of a polysilicon line. The new FOM is verified from delay measurements on inverter chains fabricated using a 0.25-μm CMOS process. A furnace TiSi2 process is used to underscore the effect of increased sheet resistance of narrow polysilicon lines. Excellent correlation between measured and predicted inverter chain delays is obtained over a variety of design, process and bias conditions. An expression for the gate sheet resistance requirement is derived from the new FOM. Using this expression, requirements on the gate sheet resistance are calculated corresponding to a technology roadmap for performance and oxide thickness 相似文献
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A driver model to calculate gate and interconnect delays accurately for a chip with coupling capacitors is presented. The crosstalk effects between simultaneously switching victim and aggressors are effectively captured by iteratively solving an N-port RC network. The algorithm was implemented in a delay calculation tool called XINT and its accuracy demonstrated for industrial designs. 相似文献
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Das B.P. Amrutur B. Jamadagni H.S. Arvind N.V. Visvanathan V. 《Semiconductor Manufacturing, IEEE Transactions on》2009,22(2):256-267
We report the design and characterization of a circuit technique to measure the on-chip delay of an individual logic gate (both inverting and noninverting) in its unmodified form. The test circuit comprises of digitally reconfigurable ring oscillator (RO). The gate under test is embedded in each stage of the ring oscillator. A system of linear equations is then formed with different configuration settings of the RO, relating the individual gate delay to the measured period of the RO, whose solution gives the delay of the individual gates. Experimental results from a test chip in 65-nm process node show the feasibility of measuring the delay of an individual inverter to within 1 ps accuracy. Delay measurements of different nominally identical inverters in close physical proximity show variations of up to 28% indicating the large impact of local variations. As a demonstration of this technique, we have studied delay variation with poly-pitch, length of diffusion (LOD) and different orientations of layout in silicon. The proposed technique is quite suitable for early process characterization, monitoring mature process in manufacturing and correlating model-to-hardware. 相似文献
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With a 45 nm process technique, the shrinking silicon feature size brings in a high-k/metal gate which significantly exacerbates the positive bias temperature instability (PBTI) and time-dependent dielectric breakdown (TDDB) effects of a NMOS transistor. However, previous works presented delay models to characterize the PBTI or TDDB individually. This paper demonstrates that the delay caused by the joint effects of PBTI and TDDB widely differs from the cumulated result of the delay caused by the PBTI and TDDB, respectively, with the experiments on an inverter chain. This paper proposes a hybrid aging delay model comprising both the PBTI and TDDB effects by analyzing the relationship between the aging propagation delay and the inherent delay of the gate. Experimental results on the logic gates under 45 nm, 32 nm, 22 nm, and 16 nm CMOS technologies show that the maximum error between the proposed model and the actual value is less than 2.5%, meanwhile the average error is about 1.5%. 相似文献
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利用多层金属导体寄生电容模型,详细分析了不同的金属互连线参数对寄生电容的影响,并采用一个闭合公式对超深亚微米级集成电路中的RC互连延迟进行估计.结果表明,当金属导线的纵横比接近2时,线间耦合电容对互连总电容的影响将占主导地位.在超深亚微米工艺条件下,当金属线宽和间距比例W/P的最优质值为0.5~0.6时,计算的互连延迟为最小.此外,还给出了低介电常数材料对互连线电容和延迟的影响,为超深亚微米级的集成电路设计与实现提供有益的参考. 相似文献
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分析了超深亚微米工艺参数波动对电路的影响;采用"放大"的思路设计了简单的用于测量超深亚微米工艺门延迟、动态功耗、静态功耗及其波动的电路,并提出了一种用于测量门延迟波动特性曲线的新型电路,该电路采用较短的反相器链可以得到超深亚微米工艺下门延迟波动特性曲线.电路在90nm CMOS工艺下进行了流片制作,得到了90nm CMOS工艺下的单位门延迟波动特性曲线.测得延迟的波动范围为78.6%,动态功耗的波动范围为94.0%,漏电流功耗的波动范围为19.5倍,其中以漏电流功耗的波动性最为严重. 相似文献