FINE RESOLUTION PHASE-SHIFTER FOR TPPI IMPLEMENTATION

这个子项目是许多研究子项目中利用 资源由NIH/NCRR资助的中心拨款提供。子项目和 调查员(PI)可能从NIH的另一个来源获得了主要资金， 并因此可以在其他清晰的条目中表示。列出的机构是 该中心不一定是调查人员的机构。 多量子相干(MQC)的实现需要时间延迟和小步长的相位推进。虽然我们可以使用专门的ECL模块来产生非常精确的计时，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，我们已经拥有了。将通过USB下载相位循环表和查找表，并使用来自系统DSP实时控制器的脉冲序列和相位推进/重置信号线对装置进行实时控制。这将使我们能够为MQC工作实施时间比例阶段增量(TPPI)。

This subproject is one of many research subprojects utilizing the resources provided by a Center grant funded by NIH/NCRR. The subproject and investigator (PI) may have received primary funding from another NIH source, and thus could be represented in other CRISP entries. The institution listed is for the Center, which is not necessarily the institution for the investigator. 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.