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rf-unit
相关语句
  射频单元
     Analysis of removing the RF-unit's malfunction by using RF-signal and MR-signal
     分析射频和核磁共振信号排除射频单元故障
短句来源
     Objective To investigate the feasibility of removing the RF-unit's malfunction by using RF-signal and MR-signal,and provide a more convenient method of removing the RF-unit's malfunction for MRI system timely.
     目的探讨利用射频信号和核磁共振信号排除射频单元故障的可行性 ,为MRI系统射频单元故障的及时排除提供更为便捷的方法。
短句来源
     Results17blooey reasons of RF-unit had been found by the method.
     结果17次射频单元故障 ,利用上述对比分析、分段排除的方法均准确查到故障原因。
短句来源
  相似匹配句对
     The Monolithic RF
     射频电路的单片集成
短句来源
     RF MEMS switch
     RF MEMS开关
短句来源
     A RF-SQUiD SIMULATOR
     RF-SQUID模拟器
短句来源
     INVESTIGATION OF TIBaCaCuO RF-SQUID
     TlBaCaCuO RF—SQUID研究
短句来源
     Unit Is Strength
     Unit Is Strength(团结就是力量) (初二适用)
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A frequency verification automatic controlled system using frequency standard as centre is introduced in the arcide. This system included EE3301, multipath, program-controlled RF unit, microconputor and printer. It can make automatic timing scan detection of 16 frequency sources under test in the frequency range 0.01Hz ̄10MHz, less self-calibrating precision 1×10-9,automatic printing primary data, and data processing as well as giving printing results. The paper also describes major constitution and principle....

A frequency verification automatic controlled system using frequency standard as centre is introduced in the arcide. This system included EE3301, multipath, program-controlled RF unit, microconputor and printer. It can make automatic timing scan detection of 16 frequency sources under test in the frequency range 0.01Hz ̄10MHz, less self-calibrating precision 1×10-9,automatic printing primary data, and data processing as well as giving printing results. The paper also describes major constitution and principle.

介绍一种以频率标准(EE3301)为核心的频率检定自控系统,包括:EE3301、多路程控射频器、微机及打印机:该系统的建立可对频率范围在0.01Hz~10MHz、自校精度为1×10(-9)以下和台数多达16台的被测频率源按照检定规程的要求,实现各种指标的自动定时巡回检测,自动打印原始数据,并进行数据处理及打印最终检定结果,各通道间的隔离度小于115dB。阐述了系统的各主要组成部分及原理、微机与频标的配接接口和控制问题、多路高隔离度程控射频器及数据传输与识别等问题,使自动检测系统保持了频标(EE3301)的原始精度。在软件编制中融进了多年的检定经验,使检定全过程周期缩短,全过程开机后全部自动完成,不需手动选项,消除了人为引入的误差,提高了工作效率,确保了检定质量。

Objective To investigate the feasibility of removing the RF-unit's malfunction by using RF-signal and MR-signal,and provide a more convenient method of removing the RF-unit's malfunction for MRI system timely.Methods RF-signal and MR-signal are separately measured when the MRI system is normal(noted as VNormal)and manufunction(noted as VBlooey),then both kinds of signal are compared and the blooey reason would be found finally.Results17blooey reasons of RF-unit had been found by the method.Conclusion...

Objective To investigate the feasibility of removing the RF-unit's malfunction by using RF-signal and MR-signal,and provide a more convenient method of removing the RF-unit's malfunction for MRI system timely.Methods RF-signal and MR-signal are separately measured when the MRI system is normal(noted as VNormal)and manufunction(noted as VBlooey),then both kinds of signal are compared and the blooey reason would be found finally.Results17blooey reasons of RF-unit had been found by the method.Conclusion The blooey point can be exactly and rapidly found by using RF-signal and MR-signal.

目的探讨利用射频信号和核磁共振信号排除射频单元故障的可行性 ,为MRI系统射频单元故障的及时排除提供更为便捷的方法。方法MRI系统工作正常时 ,测量并记录部分射频信号和核磁共振信号VNormal。当射频单元发生故障时再测量记录上述信号VBlooey ,通过对比分析 ,分段排除并最终确定故障原因。结果17次射频单元故障 ,利用上述对比分析、分段排除的方法均准确查到故障原因。结论利用射频信号和核磁共振信号能够准确、快速地查找射频单元的故障发生点。

EDA tools for design and verification are changing rapidly as microelectronics progress and the SoC becomes popular, which contains microprocessors, memories, even analog and RF units , are becoming increasingly complex in function and scale. It is impossible to use traditional tools to finish the verification task of SoC. Thus it comes so called "verification crisis" problem. To meet the problem EDA tools are experienced rapidly and fundamental changes these years. The RTL based design and verification methodologies...

EDA tools for design and verification are changing rapidly as microelectronics progress and the SoC becomes popular, which contains microprocessors, memories, even analog and RF units , are becoming increasingly complex in function and scale. It is impossible to use traditional tools to finish the verification task of SoC. Thus it comes so called "verification crisis" problem. To meet the problem EDA tools are experienced rapidly and fundamental changes these years. The RTL based design and verification methodologies have to go up to the system level, and have led to advent of the verification languages and their standardization. This paper surveys the development and the trend of design and verification languages, analyses their advantages and disadvantages. Some comments on current verification methods are also given. and the assertion based verification method is emphasized.

由于微电子技术的迅速发展和系统芯片的出现 ,包含微处理器和存储器甚至模拟电路和射频电路在内的系统芯片的规模日益庞大 ,复杂度日益增加。人们用传统的模拟方法难以完成设计验证工作 ,出现了所谓“验证危机”。为了适应这种形势 ,电子设计和验证工具正在发生迅速而深刻的变革。现在基于 RTL 级的设计和验证方法必须向系统级的设计和验证方法过渡 ,导致了验证语言的出现和标准化 ,本文将对当前出现的系统级设计和验证语言进行全面综述 ,并论述验证语言标准化的情况。分析他们的优缺点和发展趋势。最后简单评述当前的验证方法 ,说明基于断言的验证是结合形式化验证和传统模拟验证可行的途径。

 
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