FINE RESOLUTION PHASE-SHIFTER FOR TPPI IMPLEMENTATION

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。 多量子相干（MQC）的实现需要时间延迟和相位小步前进。虽然我们可以使用专门的ECL模块产生非常精确的定时，但精确的相位增量是一项艰巨的任务。为了解决这个问题，我们采购了一个6-20 GHz的12位移相器，我们将在我们最初的MQC工作中使用它，它依赖于均匀的频谱激励。 硬件控制将基于USB接口的FPGA模块，我们已经有了。相位周期表和查找表将通过USB下载，装置将使用来自系统DSP实时控制器的脉冲序列和相位提前/复位信号线进行真实的实时控制。 这将使我们能够为MQC工作实施时间比例相位增量（TPPI）。

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. Implementation of multi-quantum coherence (MQC) requires time delays and phase advances in small steps. Whereas we can produce very accurate timing using specialized ECL modules, accurate phase incrementing is a formidable task. To address this issue we procured a 6-20 GHz 12-bit phase shifter which we will use in our initial MQC work that relies on uniform spectrum excitation. A hardware control will be based on USB interfaced FPGA modules, which we already have. Phase cycle tables and look-up tables will be downloaded via USB and the unit will be controlled in real time using pulse sequence and phase advance/reset signal lines from the system DSP real-time controller. This will enable us to implement Time-Proportional Phase Incrementation (TPPI) for the MQC work.