95GHZ SPECTROMETER TIMING SIGNAL LEVEL TRANSLATOR/MONITOR

这个子项目是许多利用资源的研究子项目之一 由NIH/NCRR资助的中心拨款提供。子项目的主要支持 而子项目的主要调查员可能是由其他来源提供的， 包括其它NIH来源。 列出的子项目总成本可能 代表子项目使用的中心基础设施的估计数量， 而不是由NCRR赠款提供给子项目或子项目工作人员的直接资金。 ACERT复杂的多系统95 GHz仪器的成功维护和操作需要对多个快速定时信号进行高精度监测和评估。目前，我们采用了一些离散的宽带抽头监测这些信号通过宽带（1GHz）数字化示波器。然而，观测信号的幅度校准和保真度（均衡）低于我们更严格的评估需求，需要精确的波形再现和亚纳秒分辨率。我们还要求在几个定时通道上进行完全兼容的驱动级转换（参见子项目211，2011进展）。为了解决这些缺点，我们已经概述了一个定时转换器/监视器子系统，该子系统在从3.3伏Chase Scientific定时系统到光谱仪CMOS 5伏标准的所有定时通道上提供50欧姆受控阻抗电平转换。内置的监控功能将利用快速电流模式放大器对输出定时信号端口上出现的实际波形进行全幅高保真监控，极大地方便识别由于定时波形畸变（反射、驱动器故障等）而导致的潜在或实际系统故障。多通道定时信号电平转换器和监视器将安装在一个2U机架式机箱中，以便永久安装在95 GHz频谱仪中。

This subproject is one of many research subprojects utilizing the resources provided by a Center grant funded by NIH/NCRR. Primary support for the subproject and the subproject's principal investigator may have been provided by other sources, including other NIH sources. The Total Cost listed for the subproject likely represents the estimated amount of Center infrastructure utilized by the subproject, not direct funding provided by the NCRR grant to the subproject or subproject staff. Successful maintenance and operation of the ACERT complex, multi-system 95GHz instrument requires high accuracy monitoring and evaluation of multiple fast timing signals. Currently, we employ a number of discrete wideband tapoffs to monitor these signals via a wideband (1GHz) digitizing oscilloscope. However, the amplitude calibration and fidelity (equalization) of the observed signals is sub par for our more critical evaluation needs, where accurate waveform reproduction and sub-nanosecond resolution is required. We also have a requirement for fully compatible driver level translation on several of the timing channels (see Subproject 211, 2011 Progress). To address these shortcomings, we have outlined a timing translator/monitor subsystem that provides 50 ohm controlled-impedance level translation on all timing channels from the 3.3 volt Chase Scientific timing system to the spectrometer CMOS 5 volt standard. An included monitoring function will utilize fast current-mode amplifiers to provide full-amplitude high fidelity monitoring of the actual waveforms appearing at the outgoing timing signal ports, greatly facilitating identification of potential or actual system malfunction due to timing waveform aberrations (reflections, driver failure, etc.). The multichannel timing signal level translator and monitor is to be constructed in a single 2U rackmount chassis for permanent installation in the 95GHz spectrometer.