This paper presents the design of a low-power multi-channel analog front-end(AFE) for bio-potential recording. By using time division multiplexing(TDM), a successive approximation register analog-to-digital converter(...This paper presents the design of a low-power multi-channel analog front-end(AFE) for bio-potential recording. By using time division multiplexing(TDM), a successive approximation register analog-to-digital converter(SAR ADC) is shared among all 20 channels. A charge-sharing multiplexer(MUX) is proposed to transmit the output signals from the respective channels to the ADC. By separately pre sampling the output of each channel, the sampling time of each channel is greatly extended and additional active buffers are avoided. The AFE is fabricated in a 65-nm CMOS process, and the whole system consumes 28.2 μW under 1 V supply. Each analog acquisition channel consumes 1.25 μW and occupies a chip area of 0.14 mm2. Measurement results show that the AFE achieves an input referred noise of 1.8 μV·rms in a 350 Hz bandwidth and a noise efficiency factor(NEF) of 4.1. The 12-bit SAR ADC achieves an ENOB of 9.8 bit operating at 25 k S/s. The AFE is experimented on real-world applications by measuring human ECG and a clear ECG waveform is captured.展开更多
作为综合接入系统,PON系统不仅要能承载数据、视频和语音等业务,还应能承载TDM业务。本文结合TDM业务的传输特性,研究了TDM over EPON/GPON的各种电路仿真协议,提出了TDM over EPON/GPON的协议参考模型,详细分析了PON系统承载TDM业务的...作为综合接入系统,PON系统不仅要能承载数据、视频和语音等业务,还应能承载TDM业务。本文结合TDM业务的传输特性,研究了TDM over EPON/GPON的各种电路仿真协议,提出了TDM over EPON/GPON的协议参考模型,详细分析了PON系统承载TDM业务的关键技术。展开更多
为了适应工程中多通道振动数据的快速存储和准确查询。基于LabVIEW的TDMS(technical data management streaming)数据逻辑方式,设计实现了一套完整的某试车台振动数据存储查询虚拟仪器系统。该系统可以通过手动存储和报警自动触发存储...为了适应工程中多通道振动数据的快速存储和准确查询。基于LabVIEW的TDMS(technical data management streaming)数据逻辑方式,设计实现了一套完整的某试车台振动数据存储查询虚拟仪器系统。该系统可以通过手动存储和报警自动触发存储两种方式对多通道、多类型海量数据进行快速存储。同时,还具有对指定通道指定类型数据的准确查询、导出以及打印功能等。在某型号试车台背景下开发出来的这套性能和操控界面兼备的监测系统,对于类似工程实践具有一定的借鉴意义。展开更多
在LabVIEW中分别使用TDMS(Technical Data Management Streaming)文件和SQL Server数据库分析处理实验数据,比较两者的运行速度。对速度较慢的方法再进行算法改进,相对提高运算效率,最终分析速度差异的根本原因,这将有助于在LabVIEW的...在LabVIEW中分别使用TDMS(Technical Data Management Streaming)文件和SQL Server数据库分析处理实验数据,比较两者的运行速度。对速度较慢的方法再进行算法改进,相对提高运算效率,最终分析速度差异的根本原因,这将有助于在LabVIEW的各种应用中合理使用数据处理方式。展开更多
基金supported by the National Key R&D Program of China under Grant 2018YFA0701400 and 2018YFA0701401.
文摘This paper presents the design of a low-power multi-channel analog front-end(AFE) for bio-potential recording. By using time division multiplexing(TDM), a successive approximation register analog-to-digital converter(SAR ADC) is shared among all 20 channels. A charge-sharing multiplexer(MUX) is proposed to transmit the output signals from the respective channels to the ADC. By separately pre sampling the output of each channel, the sampling time of each channel is greatly extended and additional active buffers are avoided. The AFE is fabricated in a 65-nm CMOS process, and the whole system consumes 28.2 μW under 1 V supply. Each analog acquisition channel consumes 1.25 μW and occupies a chip area of 0.14 mm2. Measurement results show that the AFE achieves an input referred noise of 1.8 μV·rms in a 350 Hz bandwidth and a noise efficiency factor(NEF) of 4.1. The 12-bit SAR ADC achieves an ENOB of 9.8 bit operating at 25 k S/s. The AFE is experimented on real-world applications by measuring human ECG and a clear ECG waveform is captured.
文摘为了适应工程中多通道振动数据的快速存储和准确查询。基于LabVIEW的TDMS(technical data management streaming)数据逻辑方式,设计实现了一套完整的某试车台振动数据存储查询虚拟仪器系统。该系统可以通过手动存储和报警自动触发存储两种方式对多通道、多类型海量数据进行快速存储。同时,还具有对指定通道指定类型数据的准确查询、导出以及打印功能等。在某型号试车台背景下开发出来的这套性能和操控界面兼备的监测系统,对于类似工程实践具有一定的借鉴意义。
文摘在LabVIEW中分别使用TDMS(Technical Data Management Streaming)文件和SQL Server数据库分析处理实验数据,比较两者的运行速度。对速度较慢的方法再进行算法改进,相对提高运算效率,最终分析速度差异的根本原因,这将有助于在LabVIEW的各种应用中合理使用数据处理方式。
