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71.
Qingsong Cai Zhong Yang Minglei Zhang Xiaoyun Jia Xiaohua Fan 《Analog Integrated Circuits and Signal Processing》2018,94(1):19-26
A fully integrated fast-settling Fractional-N phase-locked loop (PLL) is presented. Based on the \(\Delta \varSigma\) modulator and I/Q generator architectures, the frequency synthesizer covers a frequency range of 130 MHz-1 GHz with a 3-KHz channel step. The constant loop bandwidth over the above tuning frequency ranges is achieved without modifying low pass filter parameters. The current of charge pump \(Icp\) is programmed not only to compensate the variation of voltage-controlled oscillator gain \(Kvco\), but also for adapting to the change of divider ratio \(N_{m}\). This calibration process is carried out in an open-loop condition for a small settling time. The proposed synthesizer was fabricated in 0.18 µm CMOS process. The measurement results show that the whole synthesizer PLL draws 11.3-mA including I/Q generator from 1.8 V supply. The out-of-band phase noise is ? 123 dBc/Hz@10 MHz with a 433 MHz carrier frequency after the divider. The normalized \(\left( {Icp*Kvco} \right)/N_{m}\) which is equivalent to the variation of PLL loop bandwidth ranges from ? 6 to 6%. 相似文献
72.
硅中注入高浓度碳形成微晶碳化硅的研究 总被引:4,自引:0,他引:4
为实现OEIC的全Si化,以适应稀土Er发光的宽带隙半导体材料。研究了C-Si基底上注C形成微晶碳化硅(μc-SiC)的途径。经高浓度注C,在1100-1000℃2h退火,经X-ray与Raman测试证明可以获得μc-SiC结构。因为在宽带隙μc-SiC中能量回传很少,故对Er在波长1.54μm的室温光致发光是有利的。 相似文献
73.
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75.
Zhong Wang Timothy W. O''Neil Edwin H.-M. Sha 《The Journal of VLSI Signal Processing》2001,27(3):215-233
Over the last 20 years, the performance gap between CPU and memory has been steadily increasing. As a result, a variety of techniques has been devised to hide that performance gap, from intermediate fast memories (caches) to various prefetching and memory management techniques for manipulating the data present in these caches. In this paper we propose a new memory management technique that takes advantage of access pattern information that is available at compile time by prefetching certain data elements before explicitly being requested by the CPU, as well as maintaining certain data in the local memory over a number of iterations. In order to better take advantage of the locality of reference present in loop structures, our technique also uses a new approach to memory by partitioning it and reducing execution to each partition, so that information is reused at much smaller time intervals than if execution followed the usual pattern. These combined approaches—using a new set of memory instructions as well as partitioning the memory—lead to improvements in total execution time of approximately 25% over existing methods. 相似文献
76.
光电探测器的激光破坏(损伤)阈值分析 总被引:8,自引:2,他引:8
本文系统收集各种光电探测器及其相似材料在受到激光辐照时所导致的软、硬破坏效应(有时称为激光损伤),综合对比分析各种破坏阈值的大小,为激光与光电探测器相互作用的研究提供一个较为全面系统的参考。 相似文献
77.
Jingping Zhong Xin Yang Shangzhi Gao Ji Luo Jianhui Xiang Guanhua Li Yanling Liang Lijuan Tang Cheng Qian Jing Zhou Li Zheng Kun Zhang Jinmin Zhao 《Advanced functional materials》2023,33(7):2209399
Highly-active single-atom nanoenzymes (SAzymes) with biomimetic geometric and electronic coordination structures are highly highlighted to exhibit greatly-increased catalysis activity. Despite various SAzymes, superoxide dismutase (SOD)-like SAzymes for scavenging superoxide anions to treat osteoarthritis are still absent. In this report, a graphene-supported Cl Cu N4-centered SAzyme (Cu N4ClG) is engineered that carries out SOD-like reactions. Various synchrotron radiation-based X-ray valence/structural analyses reveal that the geometric and electronic structures of such Cl Cu N4 active centers are validated to atomically match natural SOD enzyme after precisely manipulating coordinated N and Cl atoms via the unprecedented pre-coordination orientation and preservation of copper-phthalocyanine structure. Cu-N4ClG SAzymes are endowed with unparalleled catalytic activities and kinetics to degrade O2•¯ into H2O2 and O2, and further exhibit catalase (CAT)-like activity to sequentially decompose H2O2 and •OH into H2O and O2, wherein the origin of sequential SOD-like and CAT-like catalysis routes is uncovered. Impressively, nitroxide radical scavenging and photothermally-enhanced catalytic activity are reached, synergistically protecting chondrocytes from oxidative stress-induced apoptosis and alleviating osteoarthritis via re-programming or normalizing osteoarthritis microenvironments. Cu-N4ClG SAzymes are competent for other reactive oxygen species (ROS)-arised lesions, and their rationales provide guidance to design other SAzymes. 相似文献
78.
Yong Long Bing Jiang Tianci Huang Yuxiu Liu Jianan Niu Zhong Lin Wang Weiguo Hu 《Advanced functional materials》2023,33(41):2304625
Due to their intrinsic flexibility, tunable conductivity, multiple stimulus-response, and self-healing ability, ionic conductive hydrogels have drawn significant attention in flexible/wearable electronics. However, challenges remain because traditional hydrogels inevitably faced the problems of losing flexibility and conductivity because of the inner water loss when exposed to the ambient environment. Besides, the water inside the hydrogel will freeze at the water icing temperatures, making the device hard and fragile. As a promising alternative, organogels have attracted wide attention because they can, to some extent, overcome the above drawbacks. Herein, a kind of organogel ionic conductor (MOIC) by a self-polymerization reaction is involved, which is super stretchable, anti-drying, and anti-freezing. Meanwhile, it can still maintain high mechanical stability after alternately loading/unloading at the strain of 600% for 600 s (1800 cycles). Using this MOIC, high-performance triboelectric nanogenerator (TENG) is constructed (MOIC-TENG) to harvest small mechanical energy even the MOIC electrode underwent an extremely low temperature. In addition, multifunctional flexible/wearable sensors (strain sensor, piezoresistive sensor, and tactile sensor) are realized to monitor human motions in real time, and recognize different materials by triboelectric effect. This study demonstrates a promising candidate material for flexible/wearable electronics such as electronic skin, flexible sensors, and human-machine interfaces. 相似文献
79.
Alternating Magnetic Field-Enhanced Triboelectric Nanogenerator for Low-Speed Flow Energy Harvesting
Baosen Zhang Qi Gao Wenbo Li Mingkang Zhu Hengyu Li Tinghai Cheng Zhong Lin Wang 《Advanced functional materials》2023,33(42):2304839
Low-speed flow energy, such as breezes and rivers, which are abundant in smart agriculture and smart cities, faces significant challenges in efficient harvesting as an untapped sustainable energy source. This study proposes an alternating magnetic field-enhanced triboelectric nanogenerator (AMF-TENG) for low-speed flow energy harvesting, and demonstrates its feasibility through experimental results. AMF-TENG's minimum cut-in speed is 1 m s−1, thereby greatly expanding its wind energy harvesting range. When the wind speed is 1–5 m s−1, the open-circuit voltage (VOC) is 20.9–179.3 V. The peak power is 0.68 mW at 5 m s−1. In a durability test of 100 K cycles, the VOC decreases from 188.4 to 174.2 V but remain at 92.5% of the initial value. furthermore, the AMF-TENG can harvest low-speed flow energy from the natural environment to power temperature and humidity sensors and wireless light intensity sensor in smart agriculture. This study provides a promising method for low-speed flow energy harvesting in distributed applications. 相似文献
80.