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A Versatile 1.4-mW 6-bits CMOS ADC for Pulse-Based UWB Communication Systems

Journal of Electrical Engineering 2014年第3期2卷 101-107页

作者： saeed ghamari Frederic Chastellain Cyril Botteron Christian Robert Pierre-André Farine Electronics and Signal Processing Lab Ecole Polytechnique Fédérale de Lausanne Neuchatel 2000 Switzerland RUAG Space AG Zurich 8052 Switzerland

An ADC (analog to digital converter) using the low duty-cycle nature of pulse-based UWB (ultra wide-band) communications to reduce its power consumption is proposed. Implemented in CMOS (complementary metal-oxide-semiconductor) 180 nm technology, it can capture a 5 ns window at 4 GS/s each 100 ns, which corresponds to the acquisition of one UWB pulse at the pulse repetition rate of 10 Mpps (mega pulses per second). By using time-interleaved RSD (redundant signed digit) ADCs, the complete ADC occupies only 0.15 mm2 and consumes only 1.4 mW from a 1.8 V power supply. The ADC can be operated in two modes using the same core circuits (OTA (operational transconductance amplifier), comparators, etc.). The first mode is the standard RSD doubling mode, while the second mode allows improving the signal-to-noise ratio by adding coherently the transmitted pulses of one symbol. For example, for audio applications, a 300 kbps data rate and processing gain up to 15 dB can be achieved at a clock frequency of 10 MHz.

关键词：电气控制控制理论电气测量集中参数

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采用CFD得到的横摇阻尼的船舶横摇分析:数值和实验研究

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Journal of Marine Science and Application 2022年第1期21卷 67-79页

作者： Isar ghamari Hamid Reza Mahmoudi Ahmad Hajivand Mohammad saeed Seif Department of Marine Technology Norwegian University of Science and Technology(NTNU)TrondheimNorway Department of Mechanical Engineering Sharif University of TechnologyTehranIran Department of Marine Engineering Khorramshahr University of Marine Science and TechnologyKhorramshahrIran

This study investigates the roll decay of a fishing vessel by experiments and computational fluid dynamics(CFD)simulations.A fishing vessel roll decay is tested experimentally for different initial roll *** roll decay is also simulated numerically by CFD simulations and is validated against the experimental *** shows that the roll damping could be obtained by CFD with high level of *** linear and nonlinear damping terms are extracted from the CFD roll decay results and are used in a potential-based *** this way we are using a hybrid solver that benefits the accuracy of the CFD results in terms of roll damping estimation and the fast computations of the potential-based solver at the same *** hybrid method is used for reproducing the free roll decays at Fn=0 and also in analyzing some cases in *** experiments,CFD and the hybrid parts are described in *** is shown that the suggested method is capable of doing the simulations in a very short time with high level of *** strategy could be used for many seakeeping analyses.

关键词： Roll decay Computational fluid ynamics Experiments Validation Parametric rolling Fishing vessel

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