A digital calibration technique for an ultra high-speed folding and interpolating analog-to-digital con- verter in 0.18-μm CMOS technology is presented. The similar digital calibration techniques are taken for high 3...A digital calibration technique for an ultra high-speed folding and interpolating analog-to-digital con- verter in 0.18-μm CMOS technology is presented. The similar digital calibration techniques are taken for high 3-bit flash converter and low 5-bit folding and interpolating converter, which are based on well-designed calibration reference, calibration DAC and comparators. The spice simulation and the measured results show the ADC produces 5.9 ENOB with calibration disabled and 7.2 ENOB with calibration enabled for high-frequency wide-bandwidth analog input.展开更多
A 2-Gsample/s 8-b analog-to-digital converter in 0.35μm BiCMOS process technology is presented. The ADC uses the unique folding and interpolating algorithm and dual-channel timing interleave multiplexing technology t...A 2-Gsample/s 8-b analog-to-digital converter in 0.35μm BiCMOS process technology is presented. The ADC uses the unique folding and interpolating algorithm and dual-channel timing interleave multiplexing technology to achieve a sampling rate of 2 GSPS.Digital calibration technology is used for the offset and gain corrections of the S/H circuit,the offset correction of preamplifier,and the gain and clock phase corrections between channels.As a result of testing,the ADC achieves 7.32 ENOB at an analog input of 484 MHz and 7.1 ENOB at Nyquist input after the chip is self-corrected.展开更多
电磁范数作为一种定量表征脉冲波形特征的工具,已被美军标和IEC等多个国际标准所采纳,可应用于高功率电磁环境效应机理和评估技术研究。首先简要分析了不同电磁范数的物理意义及其内在关系,然后介绍了基于高速数字采样与存储技术研制的...电磁范数作为一种定量表征脉冲波形特征的工具,已被美军标和IEC等多个国际标准所采纳,可应用于高功率电磁环境效应机理和评估技术研究。首先简要分析了不同电磁范数的物理意义及其内在关系,然后介绍了基于高速数字采样与存储技术研制的范数探测器。范数探测器把测试信号直接数字化并存储到探测器内部,而不再需要传输线缆或光缆,其实时采样频率可配置为1 GHz或2 GHz,存储深度为4 k B,可拓展。编制了上位机数据软件用于在电脑上显示波形并快速计算给出波形的常用电磁范数。该范数探测器可以解决密闭腔体内耦合场全波形的测量,计算给出的电磁范数可用于效应的敏感参数分析和效应评估,以及响应定界、电磁辐射源的时间反演定位等领域。展开更多
本文介绍了一种基于超高速数据采集技术的高精度时间间隔测量系统的设计。基于对高精度时间测量应用背景下,时间-数字转换器(Ti me-to-digital Converter,TDC)与数字信号中和器(Digital Signal Averager)优缺点的对比,本文并提出了一种...本文介绍了一种基于超高速数据采集技术的高精度时间间隔测量系统的设计。基于对高精度时间测量应用背景下,时间-数字转换器(Ti me-to-digital Converter,TDC)与数字信号中和器(Digital Signal Averager)优缺点的对比,本文并提出了一种高精度数字信号中和器的设计方案。完成了前端信号调理、超高速数据采集、高速时钟产生、FPGA硬件算法设计、USB2.0接口等模块设计。测试结果表明本系统最小时间分辨率334ps,测量范围0～20us,可广泛应用于高精度时间间隔测量领域。展开更多
基金Project supported by the National Natural Science Foundation of China(Nos.60906009,60773025)the Postdoctoral Science Foundation of China(No.20090451423)the National Labs of Analog Integrated Circuits Foundation(No.9140C0901110902)
文摘A digital calibration technique for an ultra high-speed folding and interpolating analog-to-digital con- verter in 0.18-μm CMOS technology is presented. The similar digital calibration techniques are taken for high 3-bit flash converter and low 5-bit folding and interpolating converter, which are based on well-designed calibration reference, calibration DAC and comparators. The spice simulation and the measured results show the ADC produces 5.9 ENOB with calibration disabled and 7.2 ENOB with calibration enabled for high-frequency wide-bandwidth analog input.
文摘A 2-Gsample/s 8-b analog-to-digital converter in 0.35μm BiCMOS process technology is presented. The ADC uses the unique folding and interpolating algorithm and dual-channel timing interleave multiplexing technology to achieve a sampling rate of 2 GSPS.Digital calibration technology is used for the offset and gain corrections of the S/H circuit,the offset correction of preamplifier,and the gain and clock phase corrections between channels.As a result of testing,the ADC achieves 7.32 ENOB at an analog input of 484 MHz and 7.1 ENOB at Nyquist input after the chip is self-corrected.
文摘电磁范数作为一种定量表征脉冲波形特征的工具,已被美军标和IEC等多个国际标准所采纳,可应用于高功率电磁环境效应机理和评估技术研究。首先简要分析了不同电磁范数的物理意义及其内在关系,然后介绍了基于高速数字采样与存储技术研制的范数探测器。范数探测器把测试信号直接数字化并存储到探测器内部,而不再需要传输线缆或光缆,其实时采样频率可配置为1 GHz或2 GHz,存储深度为4 k B,可拓展。编制了上位机数据软件用于在电脑上显示波形并快速计算给出波形的常用电磁范数。该范数探测器可以解决密闭腔体内耦合场全波形的测量,计算给出的电磁范数可用于效应的敏感参数分析和效应评估,以及响应定界、电磁辐射源的时间反演定位等领域。
文摘本文介绍了一种基于超高速数据采集技术的高精度时间间隔测量系统的设计。基于对高精度时间测量应用背景下,时间-数字转换器(Ti me-to-digital Converter,TDC)与数字信号中和器(Digital Signal Averager)优缺点的对比,本文并提出了一种高精度数字信号中和器的设计方案。完成了前端信号调理、超高速数据采集、高速时钟产生、FPGA硬件算法设计、USB2.0接口等模块设计。测试结果表明本系统最小时间分辨率334ps,测量范围0～20us,可广泛应用于高精度时间间隔测量领域。
