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Design of a 20-Gsps 12-bit time-interleaved analog-to-digital conversion system

Nuclear Science and Techniques 2021年第3期32卷 30-40页

作者： Ruo-Shi Dong Lei Zhao Jia-Jun Qin Wen-Tao Zhong Yi-Chun Fan Shu-Bin Liu Qi An State Key Laboratory of Particle Detection and Electronics University of Science and Technology of ChinaHefei 230026China Department of Modern Physics University of Science and Technology of ChinaHefei 230026China

The time-interleaved analog-to-digital conversion(TIADC)technique is an effective method for increasing the sampling rate in a waveform digitization *** this study,a 20-Gsps TIADC system was designed.A wide-bandwidth performance was achieved by optimizing the analog circuits,and a sufficient effective number of bits(ENOB)performance guaranteed using the perfect reconstruction algorithm for mismatch error *** proposed system was verified by tests,and the results indicated that a-3 dB bandwidth of 6 GHz and the ENOB performance of 8.7 bits at 1 GHz and 7.6 bits at6 GHz were successfully achieved.

关键词： Time-interleaved technique High-speed A/D conversion High bandwidth Mismatch error correction

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Design of A High Performance Time-to-Digital Converter with Zero Dead Time on Xilinx FPGA

Design of A High Performance Time-to-Digital Converter with ...

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IEEE Instrumentation and Measurement Technology Conference

作者： Xinren Qi Yonggang Wang Department of Modern Physics State Key Laboratory of Particle Detection and Electronics University of Science and Technology of China Hefei China

ISBN: (数字)9798350380903

ISBN: (纸本)9798350380910

Nowadays the time-to-digital converters (TDCs) implemented on field programmable gate array (FPGA) can achieve reasonably high measurement resolution and precision. However, some applications also require TDCs without measurement dead time to avoid event missing. In this paper, we propose a new TDC design method that can achieve high measurement precision while achieving zero measurement dead time as well. Using the traditional structure of tapped delay line (TDL) based TDC, the proposed TDC allows consecutive trigger signals flowing into the TDL and makes the encoder capable of capturing all trigger edges with the output of their timestamps. Since there is the inherent “bubble” problem in TDL for high performance implementation, the latched TDL status is first decomposed into sixteen divisions. The trigger edges on the divisions are identified parallel, and then all the trigger signals on the TDL have to be reinstalled to obtain their precise arrival times. The TDC has been implemented on a Xilinx Zynq Ultrascale+ FPGA for performance evaluation. The test results show that the TDC can achieve a resolution of 1.92 ps and a root mean square (RMS) precision better than 3.3 ps. By measuring two trigger signals located within one TDC sampling clock cycle, the TDC can measure them correctly, which means the proposed design method is effective for realizing zero measurement dead time.

关键词： Performance evaluation Pulse measurements Design methodology Logic gates Signal generators Instrumentation and measurement Root mean square

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Prototype Design of the Time Measurement Circuit for SiPM-based T0 Detector of CEE 7

Prototype Design of the Time Measurement Circuit for SiPM-ba...

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2022 7th International Conference on Electronic Technology and Information Science, ICETIS 2022

作者： Cao, Jie Lu, Jiaming Zhao, Lei Qin, Jiajun Xu, Haoqian Liu, Shubin An, Qi State Key Laboratory of Particle Detection and Electronics University of Science and Technology of China Department of Modern Physics University of Science and Technology of China Hefei China

ISBN: (纸本)9783800757794

In Cooling Storage Ring (CSR) External-target Experiment (CEE), the T0 detector, based on plastic scintillator and SiPM, is located in the front portion of the beam target. It is designed to record the beam's arrival time and provide the start time to the other detectors. In this paper, a prototype design of the readout electronics system for the T0 detector is presented. This design aims to reach a high precision time measurement and requires a resolution under 50 ps RMS each channel for the whole system — the combination of T0 detectors and readout electronics system. To achieve high precision time measurement, a circuit divided into two parts is implemented — the pre-amplification and discrimination circuit based on NINO chip and the circuit that realizes Time-to-Digital Converter (TDC) based on FPGA. Meanwhile, the temperature compensation circuit for the SiPMs is implemented to eliminate the temperature drift by altering the operating voltage (Vop) of the SiPM. By conducting a series of tests to evaluate the performance of this prototype circuit, the function has been proven to be successful with a resolution of the readout electronic system better than 15 ps RMS within the dynamic range of detector output signals. A high resolution of voltage adjustment can be made using the temperature compensation circuits. © VDE VERLAG GMBH ∙ Berlin ∙ Offenbach.

关键词： Timing circuits

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An Electronic Design for a Multi-channel Digital Positron Annihilation Spectrometer Based on Multiplexing Technology 5

An Electronic Design for a Multi-channel Digital Positron An...

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5th IEEE International Conference on electronics Technology, ICET 2022

作者： Libo, Gu Hao, Liang Jiajin, Ge University of Science and Technology of China State Key Laboratory of Particle Detection and Electronics University of Science and Technology of China Department of Modern Physics Hefei China

ISBN: (纸本)9781665485081

Positron Annihilation Spectroscopy (PAS), as an important method for studying the microstructure of materials, has the advantages of high sensitivity and no damage to the tested samples. As Silicon Photomultiplier (Si-PM) has the advantages of low price, small size, light weight, low power consumption, high photon detection efficiency, and sensitivity to magnetic fields, it is widely used in PAS. However, some experiments need to collect the position information of photons, which requires a large number of readout channels, will greatly increases the cost. This paper proposes a resistor network design based on multiplexing technology, which simplifies the 8*8 readout channels to 4 channels. © 2022 IEEE.

关键词： Spectrometers

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A High Integrative Frequency Measurement Method Based on TDC

A High Integrative Frequency Measurement Method Based on TDC

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IEEE Instrumentation and Measurement Technology Conference

作者： Ziqi Wang Zhongtao. Shen Junchen. Wang Wenhao. Dong Changqing. Feng Shubin. Liu State Key Laboratory of Particle Detection and Electronics University of Science and Technology of China Hefei China

In order to meet the needs of sensor miniaturization, this paper implements a high integrative frequency measurement method in a low-end Field Programmable Gate Array (FPGA). This method combines the simple structure of equal precision frequency measurement method and the high precision of TDC. The TDC uses tapped-delay line (TDL) structure and uses the wave union A method to reduce resource consumption and improve the resolution of time measurements. Tests have been done to verify the feasibility of this method, and the frequency measurement precision can reach Milli Hertz within 1s. This method has a broad prospect of low cost and miniaturization application.

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General Nuclear Signal Acquisition System Based on Reconstruction Technology

General Nuclear Signal Acquisition System Based on Reconstru...

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International Conference on electronics Technology (ICET)

作者： Wei Wenshan Jin Ge Li Yingjie State Key Laboratory of Particle Detection and Electronics University of Science and Technology of China Hefei China

Since the 1960s and 1970s, the research of nuclear detection methods has been the focus of attention. On this basis, a series of nuclear signal processing methods and nuclear instruments based on NIM, CAMAC and VME have been developed. With the advent of the digital information age, the introduction of digital pulse processing technology and reconstruction technology has broken the traditional processing way of nuclear signal in nuclear detection system and become a new development direction of nuclear electronics. In this paper, a general nuclear signal acquisition system based on reconfiguration technology is introduced. Based on the reconfigurable characteristics of FPGA, the acquisition system has waveform display, calibrator, digital multichannel and other functions on the unified hardware platform through the modular configuration of FPGA, so as to meet different detection requirements. The test shows that the acquisition system is superior to commercial equipment in performance, and can fully meet the basic needs of ion detection, and the integration is higher, more convenient, economic and universal.

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First Principle Study on Schottky Barrier at Ni/Graphene/4H-SiC Interface

First Principle Study on Schottky Barrier at Ni/Graphene/4H-...

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2023 International Conference on Materials Physics and Applications

作者： Wang, Congcong Jiang, Zhenyu Huang, Yingjie Wu, Siyu Institute of High Energy Physics Chinese Academy of Sciences Beijing100049 China Department of Physics Liaoning University Shenyang110036 China Department of Physics Jilin University Changchun130012 China State Key Laboratory of Particle Detection and Electronics Beijing100049 China

High stability 4H-SiC ohmic contact is currently a key technical challenge that silicon carbide devices urgently need to overcome. It is important to reduce the Schottky barrier height (SBH) at the Ni/4H-SiC interface to optimize ohmic contact. In this paper, the mechanisms of graphene layer changing Ni/4H-SiC interface Schottky barrier height (SBH) are studied based on the first-principles method within the local density approximation. Theoretical studies have shown that graphene intercalation can reduce the SBH of Ni and 4H-SiC interfaces. The reason of SBH reduction may be that the graphene C atoms saturate the dangling bonds on the 4H-SiC surface and the influence of the metal-induced energy gap state at the interface is reduced. In addition, the new phase formed at the interface of graphene and silicon carbide has a lower work function. Furthermore, an interfacial electric dipole layer may be formed at the 4H-SiC/graphene interface which may also reduce the SBH. These results make them to be promising candidates for future radiation resistant electronics. © Published under licence by IOP Publishing Ltd.

关键词： Silicon carbide

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A SiPM-Based Wireless Neutron-Gamma Spectrometer for Remote Monitoring

A SiPM-Based Wireless Neutron-Gamma Spectrometer for Remote ...

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International Conference on electronics Technology (ICET)

作者： Qi Hu Haoqi Ye Ge Jin State Key Laboratory of Particle Detection and Electronics University of Science and Technology of China Hefei China

In this study, we designed a wireless neutron-gamma spectrometer based on SiPM for remote monitoring, which uses a CLYC scintillator and SiPM array to detect gamma and neutron events. CLYC scintillator coupled with SiPM array is very suitable for small detectors. The wireless energy spectrometer has a size of 100 $\times$ 80 $\times$ 30 mm and a weight of about 300g. After the signal is digitalized in the analog-to-digital converter (ADC), the data will be transmitted to the FPGA for processing to achieve waveform reconstruction, cache, energy spectrum accumulation and other functions. The results are uploaded to the upper computer through the ZigBee wireless transmission protocol, and the present monitoring results are displayed. The wireless spectrometer provides 13% energy resolution at 662 keV, and a full energy range up to 1.5 MeV. The experimental results display that the wireless spectrometer realizes the remote monitoring of radiation activities on the basis of portability, which greatly facilitates the field environmental radiation detection.

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Fully Digitally Controlled Voltage Regulator Based on FPGA

Fully Digitally Controlled Voltage Regulator Based on FPGA

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New Energy and Power Engineering (ICNEPE), International Conference on

作者： Wanxin Zhou Kezhu Song Chuan Wu Lingnan Hu State Key Laboratory of Particle Detection and Electronics University of Science and Technology of China Hefei China

This paper presents the implementation and test results of a fully digitally controlled voltage regulator (VR) designed for high-performance microprocessors. The VR consists of two print circuit boards (PCB). The first PCB, referred to as the power board, is responsible for voltage conversion and incorporates components such as main power supply, output capacitor, and electronic load. The second PCB, referred to as the control board, is dedicated to signal sampling and digital control, including analog-to-digital converters (ADC) and field-programmable gate array (FPGA). The paper provides a detailed description of the implementation of the VR and presents the test results.

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Heterocycles for direct air capture and MOFs prepared from CO2 utilization†

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Journal of Materials Chemistry A 2024年第13期12卷 7711-7723页

作者： Du, Jingcheng Liu, Linghao Sun, Qian Song, Ziye Yao, Ayan Ma, Ji Chung, Tai-Shung Xu, Wei Zhang, Hongjun Liu, Jiangtao Department of Environmental Science and Engineering University of Science and Technology of China Hefei230052 China Department of Chemical and Biomolecular Engineering National University of Singapore 117576 Singapore Graduate Institute of Applied Science and Technology National Taiwan University of Science and Technology Taipei10607 Taiwan State Key Laboratory of Particle Detection and Electronics University of Science and Technology of China Hefei230052 China

The technology for carbon capture, utilization, and storage (CCUS) has drawn global attention because of the rapid climate changes. Herein, a series of nitrogen-rich heterocycles (HCx–Ny) was identified for direct air capture (DAC) based on a phase change mechanism. HCx–Ny possessed a CO2 removal efficiency of up to 99% under continuous CO2 flow with a concentration of 437 ppm via spontaneous CO2 fixation because it has a high CO2 sorption capacity of 23.82 mol kg−1. Based on this phenomenon, a green and highly efficient strategy was discovered to utilize CO2 for different MOF syntheses via altering monomers and anions (SO42−, OAC−, and NO3−). Furthermore, we made a novel discovery that anions significantly affect the topological structures and morphologies of MOFs. Hence, from the discovery of nitrogen-rich heterocycles (HCx–Ny) to direct air carbon capture to the synthesis of high value-added MOFs and then to the construction of high-performance gas separation membranes, this integrated strategy provided significant insights into the development of a comprehensive CCUS technology. © 2024 Royal Society of Chemistry. All rights reserved.

关键词： Carbon dioxide

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