Design and realization of decimation filter for 24 bit Σ-Δ A/D converter

近十几年来，随着微电子技术的快速发展和计算机技术在集成电路中的应用，集成电路已发展到超大规模甚至是单片系统集成阶段，大大促进了数字技术的发展。数字技术具有速度快、精度高、抗干扰能力强等优点而得到广泛的应用，越来越多的电子设备已经从采用模拟电路实现而大范围地向数字化转变。随着数字化进程的深入，作为连接模拟和数字世界桥梁的模数转换器也同样成为研究热点，其中高位的Σ-Δ型A/D转换器作为高精度信号处理中的重要接口部件，由于其转换精度高而使它们在当今高精度信号处理领域中倍受青睐。因此本论文以实现性能良好的高位Σ-Δ型A/D转换器芯片为目标，设计和实现一款24位Σ-Δ型A/D转换器的关键部分——数字抽取...With the rapid development of microelectronic technology and the aid of computer technology in IC design and development, the scale and complexity of integrated circuits have been increasing exponentially over the past few decades. Due to its flexibility, high resolution, strong anti-interference and fast increasing processing power, more and more applications are using digital circuits and digita...学位：工学硕士院系专业：物理与机电工程学院物理学系_微电子学与固体电子学学号：2005130168

0.8 V Bandpass Filter Based on Switched-RC Technique

开关电容滤波器是信号处理系统的重要组成模块,设计了一种用于心率检测设备的六阶带通开关电容滤波器。该设计基于开关电阻电容技术,利用开关电阻代替传统的采样开关,实现了更高的采样线性度,是低压下开关电容滤波器正常工作的一种全新实现方案。仿真结果表明,该滤波器在0.8 V工作电压下,功耗为0.9 mW,输出摆幅可达1.2Vp-p,通带增益为10 dB,-3 dB带宽为25~80 Hz。A six-order bandpass switched-capacitor filter for a heart rate sensing equipment has been designed.The filter is based on the switched-RC technology which is a new approach to realize the propel operation of SC filter under low supply voltage.The simulation results show that:at 0.8 V supply voltage,it consumes about 0.9 mW,the output swing is 1.2 Vp-p,and the inband gain is 10 dB,-3 dB bandwidth is 25~80 Hz

大连极紫外相干光源

先进光源的发展在前沿科学研究中发挥的作用越来越重要。近十年来,飞速发展的自由电子激光技术为科学家们提供了探索未知世界、发现新科学规律和实现技术变革的重要工具。建成的大连极紫外(EUV)相干光源的运行波段为50~150nm,单脉冲能量大于100μJ,且可提供10-12 s和10-13 s量级的超快激光脉冲,是我国第一台自由电子激光用户装置,并且是国际上唯一运行在极紫外波段的自由电子激光用户装置,在世界范围内为用户提供具有高峰值亮度和超短脉冲的极紫外激光。大连EUV相干光源是由国家自然科学基金委资助、由中国科学院大连化学物理研究所和上海应用物理研究所共同承担的重大科学仪器研制项目,目标是打造一个以先进极紫外光源为核心、主要用于能源基础科学研究的光子科学平台

Determination of the number of ψ(3686) events taken at BESIII

The number of ψ(3686) events collected by the BESIII detector during the 2021 run period is determined to be (2259.3±11.1)×106 by counting inclusive ψ(3686) hadronic events. The uncertainty is systematic and the statistical uncertainty is negligible. Meanwhile, the numbers of ψ(3686) events collected during the 2009 and 2012 run periods are updated to be (107.7±0.6)×106 and (345.4±2.6)×106, respectively. Both numbers are consistent with the previous measurements within one standard deviation. The total number of ψ(3686) events in the three data samples is (2712.4±14.3)×10^

JUNO Sensitivity on Proton Decay p→νˉK+p\to \bar\nu K^+ Searches

The Jiangmen Underground Neutrino Observatory (JUNO) is a large liquid scintillator detector designed to explore many topics in fundamental physics. In this paper, the potential on searching for proton decay in $p\to \bar\nu K^+$ mode with JUNO is investigated.The kaon and its decay particles feature a clear three-fold coincidence signature that results in a high efficiency for identification. Moreover, the excellent energy resolution of JUNO permits to suppress the sizable background caused by other delayed signals. Based on these advantages, the detection efficiency for the proton decay via $p\to \bar\nu K^+$ is 36.9% with a background level of 0.2 events after 10 years of data taking. The estimated sensitivity based on 200 kton-years exposure is $9.6 \times 10^{33}$ years, competitive with the current best limits on the proton lifetime in this channel

JUNO sensitivity on proton decay p → ν K + searches*

The Jiangmen Underground Neutrino Observatory (JUNO) is a large liquid scintillator detector designed to explore many topics in fundamental physics. In this study, the potential of searching for proton decay in the $p\to \bar{\nu} K^+$ mode with JUNO is investigated. The kaon and its decay particles feature a clear three-fold coincidence signature that results in a high efficiency for identification. Moreover, the excellent energy resolution of JUNO permits suppression of the sizable background caused by other delayed signals. Based on these advantages, the detection efficiency for the proton decay via $p\to \bar{\nu} K^+$ is 36.9% ± 4.9% with a background level of $0.2\pm 0.05({\rm syst})\pm$$0.2({\rm stat})$ events after 10 years of data collection. The estimated sensitivity based on 200 kton-years of exposure is $9.6 \times 10^{33}$ years, which is competitive with the current best limits on the proton lifetime in this channel and complements the use of different detection technologies