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Analysis and design of sigma-delta interface circuit for quartz flexural pendulum accelerometer
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作者 周薇 蔡体菁 《Journal of Southeast University(English Edition)》 EI CAS 2011年第3期266-269,共4页
For the high resolution required in a digital interface circuit of an accelerometer used in feeble gravity measurement, a switched-capacitor (SC) sigma-delta modulator (SDM) is proposed. Based on the principle and... For the high resolution required in a digital interface circuit of an accelerometer used in feeble gravity measurement, a switched-capacitor (SC) sigma-delta modulator (SDM) is proposed. Based on the principle and the topology structure of the SDMs, the influence of oversampling ratio, bits of an internal quantizer and the cascaded structure on weak signal detecting precision is analyzed, and an ideal low-distortion SDM with a second-order 1-bit structure satisfying the high- resolution interface circuit of an accelerometer is designed. With the research on non-idealities of each SDM block in the SC circuit implementation and their impacts on power consumption, the realized parameters of low-power SDMs based on different bandwidths are devised and the power consumption of each SDM is estimated. Time-domain behavioral simulation is explored based on Simulink. The results demonstrate that a 21- bit resolution of the designed SDMs can be achieved on the premise of low power, and the parameters for the circuit implementation can be directed to the transistor-level circuit design. 展开更多
关键词 switched-capacitor (SC) circuit modulator (SDM) high resolution NON-IDEALITY low sigma-delta power
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Energy-efficient data transmission with non-ideal circuit power for downlink cellular networks
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作者 杨灼其 周庆 +2 位作者 刘楠 潘志文 尤肖虎 《Journal of Southeast University(English Edition)》 EI CAS 2017年第1期5-13,共9页
The downlink energy-efficient transmission schedule with non-ideal circuit power over Wreless networks involving a single transmitter and multiple receivers was investigated. According to the special structure of the ... The downlink energy-efficient transmission schedule with non-ideal circuit power over Wreless networks involving a single transmitter and multiple receivers was investigated. According to the special structure of the problem, a novel algorithm called OOSCPMR (the optimal offine scheduling with non-ideal circuit power for multi-receivers) is proposed, and the optimal offine solutions to optimize the energy- efficient transmission policy are found. The packets to be transmitted can be divided into two types where one type of packet is determined to be transmitted using the enrgy- efficient tansmission time, and the other type of packet is determined by the ID moveright algorithm. Finally, an energy-efficient online schedule is developed based on te proposed OOSCPMR algoriAm. Simulation results show that the optima offline transmission schedule provides te lower bound performance for the online tansmission schedule. The proposed optimal offline and online policy is more energy efficient than the existing schemes tat assume ideal circuit power. 展开更多
关键词 energy efficiency transmission schedule multiple receivers non-ideal circuit power
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吸附碳泵循环构建与能耗分析:从热力学角度
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作者 李双俊 邓帅 +2 位作者 赵睿恺 赵力 许伟聪 《工程热物理学报》 EI CAS CSCD 北大核心 2020年第2期313-319,共7页
从热力学角度审视制约吸附法碳捕集技术推广和工业化应用的能耗问题,其实质是对捕集过程中能量在不同形式之间转换机制的深入认识问题.应用热力学中的"循环"这一成熟概念和衍生工具,对能量转换问题展开专题分析应是恰当的。... 从热力学角度审视制约吸附法碳捕集技术推广和工业化应用的能耗问题,其实质是对捕集过程中能量在不同形式之间转换机制的深入认识问题.应用热力学中的"循环"这一成熟概念和衍生工具,对能量转换问题展开专题分析应是恰当的。本文基于热力学碳泵概念,从热力学角度进行吸附碳泵循环的构建与能耗分析,将碳捕集能耗分析模型具化至循环层面。从热力学第一定律角度,基于无限碳源、汇假设,定义工作于碳源、汇之间的吸附碳泵循环,形成抽象模型求解理想功耗及循环COPCO2,与混合气体分离模型(MGS)分析结果进行对比,并分析关键循环参数的影响;从热力学第二定律角度,基于状态点过程解耦方法"白箱化"吸附碳泵循环中具体过程,形成具体模型分析循环中熵增、熵产机制,证实优化传热过程、提升吸附剂性能作为有效降低能耗策略在热力学层面的恰当性。 展开更多
关键词 吸附 碳捕集 热力学碳泵 理想功耗 熵产
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