A simplified method for characterization of standard library cells based on the linear delay model is presented in this paper. The linear model is chosen as it allows rapid characterization with a modest number of simulations, while achieving acceptable accuracy. All the parameters of cell delays are defined as 50%-to-50% delays, as distinguished from 50%-to-threshold or threshold-to-50% often used in commercial tools. We found that the 50%-to-50% definition of delays is more consistent and leads to closed-form formula. A subset of library cells in a 0.25 μm technology was characterized using the proposed technique. A test circuit was subsequently generated and simulated to determine the accuracy of the proposed characterization method. SPICE simulations on the test circuit show that the timing estimations obtained through the proposed method is accurate to within 5.6%, and the power estimation was accurate to 4.2%, ignoring parasitics on interconnections.
In this paper, we present three digital multiplier architectures capable of operating in the gigahertz range, based on MOS Current Mode Logic (MCML) style. A small library of MCML logic gates consisting of NAND/AND, XOR/XNOR, (3x2) counter (full adder), [4:2] compressor, and master-slave flip-flop were designed and optimized for high-speed operation. Using these gates, we propose three different 8-bit MCML binary-tree multiplier architectures and compare their performance in terms of latency, throughput (number of multiplications per second) and power consumption. According to our simulation, the fastest multiplier targeting for TSMC 0.18 µm CMOS technology attains a throughput of 4.76 GHz or 4.76 Billion multiplications per second and a latency of 3.8 ns.
COMPONENT ANALYSIS OF PURIFICATION SYSTEM OF RSG-GAS. Component reliability analysis is required in the aging management of RSG-GAS that has reached an age of 30 years. One of the required analyses is the assessment of the distribution of repair data and the estimation of related parameters. The Primary Purification System (KBE01) and the Purification and Warm Water Layer System (KBE02) are important components of RSG-GAS. By knowing the repair data distribution, the parameters of the most frequently occurring component repair and the average of the repair period can be estimated, so that the required provision of spare parts for the smooth operation of the reactor can be predicted. The purpose of this study is to analyze the components of the KBE01 and KBE02 systems through the data distribution approach using the matching test method. With the matching test, the form of data distribution can be determined, so the parameter of the average component repair period that can be used as a comparison of the maintenance period of the components can be estimated. The repair times of KBE01 and KBE02 in RSG-GAS on Core 52 through Core 88 (2006-2015) were analyzed using goodness-of-fit test. The repair times of AA068 and AP001 KBE01 follow the exponential distribution with average repair times of 631.6 and 451.2 days, respectively. The repair times of WWL and AA002 KBE02 followed an exponential distribution with average repair times of 239.5 days and 888.0 days.
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