This paper introduces a high-performance analog front end for a passive UHF RFID transponder IC, which is compatible with the ISO/IEC 18000-6B standard,operating at the 915MHz ISM band with a total supply current cons...This paper introduces a high-performance analog front end for a passive UHF RFID transponder IC, which is compatible with the ISO/IEC 18000-6B standard,operating at the 915MHz ISM band with a total supply current consumption less than 8μA. There are no external components, except for the antenna. The passive IC＇s power supply is taken from the energy of the received RF electromagnetic field with the help of a Schottky diode rectifier. The RFID analog front end includes a local oscillator, clock generator, power on reset circuit, matching network and backscatter,rectifier,regulator, and AM demodulator. The IC, whose reading distance is more than 3m,is fabricated with a Chartered 0.35μm two-poly four-metal CMOS process with Schottky diodes and is EEPROM supported. The core size is 300μm × 720μm.展开更多
为有效改善船舶电力推进系统电能质量和能量反馈,将有源前端(Active Front End,AFE)变频器应用于船舶电力推进电机控制.根据船舶电力推进系统的特点,选择基于电流内环前馈解耦控制的直接电流控制方法,并对AFE变频器的独立控制和联合控...为有效改善船舶电力推进系统电能质量和能量反馈,将有源前端(Active Front End,AFE)变频器应用于船舶电力推进电机控制.根据船舶电力推进系统的特点,选择基于电流内环前馈解耦控制的直接电流控制方法,并对AFE变频器的独立控制和联合控制方式进行研究.用MATLAB/Simulink对这两种方式进行仿真.分析仿真结果,得出这两种控制方式分别适应的电力推进船舶类型.展开更多
为了减小用电设备对电网的谐波污染和提高自身的功率因数,AFE的应用越来越广泛。研究及分析了有源前端AFE(active front end)的工作原理、数学模型、电压和电流的闭环控制策略,给出了主电路的结构和主要参数的设计方法。通过仿真分析了...为了减小用电设备对电网的谐波污染和提高自身的功率因数,AFE的应用越来越广泛。研究及分析了有源前端AFE(active front end)的工作原理、数学模型、电压和电流的闭环控制策略,给出了主电路的结构和主要参数的设计方法。通过仿真分析了控制方案的可行性,并列举了在工程上的应用。应用实例表明,AFE有良好的动态性能,在工业现场运行安全可靠。展开更多
Extracting characteristic brain signals and simultaneous recording animals behaving could help us to understand the complex behavior of neuronal ensembles. Here, a system was established to record local field potentia...Extracting characteristic brain signals and simultaneous recording animals behaving could help us to understand the complex behavior of neuronal ensembles. Here, a system was established to record local field potentials (LFP) and extracellular signal or multiple-unit discharge and behavior synchronously by utilizing electrophysiology and integrated circuit technique. It comprised microelectrodes and micro-driver assembly, analog front end (AFE),while a computer (Pentium III ) was used as the platform for the graphic user interface, which was developed using the LabVIEW programming language. It was designed as a part of ongoing research to develop a portable wireless neural signal recording system. We believe that this information will be useful for the research of brain-computer interface.展开更多
针对有源前端AFE(active front-end)变换器电流环采用的有限控制集模型预测控制算法FCS-MPC(finite control set model predictive control),存在数字控制器计算量大、输出的电流脉动大和系统性能差等问题,提出了一种改进模型预测控制...针对有源前端AFE(active front-end)变换器电流环采用的有限控制集模型预测控制算法FCS-MPC(finite control set model predictive control),存在数字控制器计算量大、输出的电流脉动大和系统性能差等问题,提出了一种改进模型预测控制策略。首先通过坐标变换构建α-β坐标下AFE变换器的预测模型;结合电压型空间矢量变换的原理,引入矢量扇区判断法,减少最优电压矢量选择的次数;最后根据选出来的电压矢量,在1个控制周期内同时施加有效电压矢量和零电压矢量,并分配相应的作用时间。该方法不但保留了传统MPC算法的快速动态响应特性,而且改善了系统的稳态性能。仿真和实验结果均验证了所提方法的正确性与有效性。展开更多
Ultrasonic testing systems have been extensively used in medical imaging and non-destructive testing applications. Generally, these systems aim at a particular application or target material. To make these systems por...Ultrasonic testing systems have been extensively used in medical imaging and non-destructive testing applications. Generally, these systems aim at a particular application or target material. To make these systems portable and more adaptable to the test environments, this study presents a reconfigurable ultrasonic testing system (RUTS), which possesses dynamic reconfiguration capabilities. RUTS consists a fully programmable Analog Front-End (AFE), which facilitates beamforming and signal conditioning for variety of applications. RUTS AFE supports up to 8 transducers for phased-array implementation. Xilinx Zynq System-on-Chip (SoC) based Zedboard provides the back-end processing of RUTS. The powerful ARM embedded processor available within Zynq SoC manages the ultrasonic data acquisition/processing and overall system control, which makes RUTS a unique platform for the ultrasonic researchers to experiment and evaluate a wide range of real-time ultrasonic signal processing applications. This Linux-based system is utilized for ultra-sonic data compression implementation providing a versatile environment for further development of ultrasonic imaging and testing system. Furthermore, this study demonstrates the capabilities of RUTS by performing ultrasonic data acquisition and data compression in real-time. Thus, this reconfigurable system enables ultrasonic designers and researchers to efficiently prototype different experiments and to incorporate and analyze high performance ultrasonic signal and image processing algorithms.展开更多
单对线以太网是近年来新兴的以太网技术,随着汽车自动驾驶和工业物联网的高速发展,凭借上层应用扩展和底层布线上的绝对优势,正在大规模应用。单对线以太网物理层模拟前端技术是实现单对线以太网通信的关键基础技术。本文讲述了现有单...单对线以太网是近年来新兴的以太网技术,随着汽车自动驾驶和工业物联网的高速发展,凭借上层应用扩展和底层布线上的绝对优势,正在大规模应用。单对线以太网物理层模拟前端技术是实现单对线以太网通信的关键基础技术。本文讲述了现有单对线以太网物理层模拟前端相关的标准,架构及相关模块设计技术,重点对发射器TX和接收器RX关键模块的现有实现技术及其优缺点进行了列举分析。发射器TX电流模结构易于实现高精度但功耗效率低,电压模结构精度略低但功耗效率更高;接收器RX的设计围绕模拟数字转换器(Analog-to-Digital Converter,ADC)展开,ADC决定着整个RX的性能、功耗、面积和复杂度,分段和重新装配(Segmentation And Reassembly,SAR)ADC是首选结构,应用上限不断提高。由此进一步明确了在高性能、低功耗、小面积的单对线以太网物理层模拟前端设计中的挑战。展开更多
文摘This paper introduces a high-performance analog front end for a passive UHF RFID transponder IC, which is compatible with the ISO/IEC 18000-6B standard,operating at the 915MHz ISM band with a total supply current consumption less than 8μA. There are no external components, except for the antenna. The passive IC＇s power supply is taken from the energy of the received RF electromagnetic field with the help of a Schottky diode rectifier. The RFID analog front end includes a local oscillator, clock generator, power on reset circuit, matching network and backscatter,rectifier,regulator, and AM demodulator. The IC, whose reading distance is more than 3m,is fabricated with a Chartered 0.35μm two-poly four-metal CMOS process with Schottky diodes and is EEPROM supported. The core size is 300μm × 720μm.
文摘为有效改善船舶电力推进系统电能质量和能量反馈,将有源前端(Active Front End,AFE)变频器应用于船舶电力推进电机控制.根据船舶电力推进系统的特点,选择基于电流内环前馈解耦控制的直接电流控制方法,并对AFE变频器的独立控制和联合控制方式进行研究.用MATLAB/Simulink对这两种方式进行仿真.分析仿真结果,得出这两种控制方式分别适应的电力推进船舶类型.
文摘为了减小用电设备对电网的谐波污染和提高自身的功率因数,AFE的应用越来越广泛。研究及分析了有源前端AFE(active front end)的工作原理、数学模型、电压和电流的闭环控制策略,给出了主电路的结构和主要参数的设计方法。通过仿真分析了控制方案的可行性,并列举了在工程上的应用。应用实例表明,AFE有良好的动态性能,在工业现场运行安全可靠。
基金Shandong Science Development FundGrant number:041120101
文摘Extracting characteristic brain signals and simultaneous recording animals behaving could help us to understand the complex behavior of neuronal ensembles. Here, a system was established to record local field potentials (LFP) and extracellular signal or multiple-unit discharge and behavior synchronously by utilizing electrophysiology and integrated circuit technique. It comprised microelectrodes and micro-driver assembly, analog front end (AFE),while a computer (Pentium III ) was used as the platform for the graphic user interface, which was developed using the LabVIEW programming language. It was designed as a part of ongoing research to develop a portable wireless neural signal recording system. We believe that this information will be useful for the research of brain-computer interface.
文摘针对有源前端AFE(active front-end)变换器电流环采用的有限控制集模型预测控制算法FCS-MPC(finite control set model predictive control),存在数字控制器计算量大、输出的电流脉动大和系统性能差等问题,提出了一种改进模型预测控制策略。首先通过坐标变换构建α-β坐标下AFE变换器的预测模型;结合电压型空间矢量变换的原理,引入矢量扇区判断法,减少最优电压矢量选择的次数;最后根据选出来的电压矢量,在1个控制周期内同时施加有效电压矢量和零电压矢量,并分配相应的作用时间。该方法不但保留了传统MPC算法的快速动态响应特性,而且改善了系统的稳态性能。仿真和实验结果均验证了所提方法的正确性与有效性。
文摘Ultrasonic testing systems have been extensively used in medical imaging and non-destructive testing applications. Generally, these systems aim at a particular application or target material. To make these systems portable and more adaptable to the test environments, this study presents a reconfigurable ultrasonic testing system (RUTS), which possesses dynamic reconfiguration capabilities. RUTS consists a fully programmable Analog Front-End (AFE), which facilitates beamforming and signal conditioning for variety of applications. RUTS AFE supports up to 8 transducers for phased-array implementation. Xilinx Zynq System-on-Chip (SoC) based Zedboard provides the back-end processing of RUTS. The powerful ARM embedded processor available within Zynq SoC manages the ultrasonic data acquisition/processing and overall system control, which makes RUTS a unique platform for the ultrasonic researchers to experiment and evaluate a wide range of real-time ultrasonic signal processing applications. This Linux-based system is utilized for ultra-sonic data compression implementation providing a versatile environment for further development of ultrasonic imaging and testing system. Furthermore, this study demonstrates the capabilities of RUTS by performing ultrasonic data acquisition and data compression in real-time. Thus, this reconfigurable system enables ultrasonic designers and researchers to efficiently prototype different experiments and to incorporate and analyze high performance ultrasonic signal and image processing algorithms.
文摘单对线以太网是近年来新兴的以太网技术,随着汽车自动驾驶和工业物联网的高速发展,凭借上层应用扩展和底层布线上的绝对优势,正在大规模应用。单对线以太网物理层模拟前端技术是实现单对线以太网通信的关键基础技术。本文讲述了现有单对线以太网物理层模拟前端相关的标准,架构及相关模块设计技术,重点对发射器TX和接收器RX关键模块的现有实现技术及其优缺点进行了列举分析。发射器TX电流模结构易于实现高精度但功耗效率低,电压模结构精度略低但功耗效率更高;接收器RX的设计围绕模拟数字转换器(Analog-to-Digital Converter,ADC)展开,ADC决定着整个RX的性能、功耗、面积和复杂度,分段和重新装配(Segmentation And Reassembly,SAR)ADC是首选结构,应用上限不断提高。由此进一步明确了在高性能、低功耗、小面积的单对线以太网物理层模拟前端设计中的挑战。
