DESIGN OF ULTRA-HIGH SPEED SWITCHES FOR GENERATION OF NANOSECOND MCROWAVE

用于产生纳秒微波的超高速开关的设计

• 批准号: 7420460
• 负责人: PETER P BORBAT
• 金额: $ 1.36万
• 依托单位: CORNELL UNIVERSITY
• 依托单位国家: 美国
• 财政年份: 2006
• 资助国家: 美国
• 起止时间: 2006-09-15 至 2007-08-31
• 项目状态: 已结题
• 来源: https://reporter.nih.gov/project-details/7420460
• 关键词: fasting

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. In FT-ESR and DQC ESR we use microwave pulses with a width of a few nanoseconds. The generation of such pulses requires the use of very fast microwave switches. We purchased from several vendors the fastest switches available on the market. They are based on different types of fast pin-diodes. We found their switching speed is limited to 1-1.5 ns for the rise time and to a somewhat greater value of 1.5-3.5 ns fall times. Also, jitter is observed on the shorter edges. We need faster, more stable switching with both rise and fall times shorter than 1 ns and negligible video transients. Also, it is difficult to bring two short pulses close to each other using pin-diode switches. We successfully tested a switch based on MMIC technology, with improved performance characteristics, and switching in both directions in 1 ns at optimal conditions. This type of switch requires a very fast driver capable of generating voltage swings of 6 V in less than 1 ns and a 300 MHz data rate. This is challenging but we are close to a solution of this problem. In order to minimize the switching time and reduce the jitter to an insignificant level the switch needs to be integrated with the driver using surface-mount technology and wire-bonding techniques. Further progress on this pending project is contingent on the availability of funds needed to connectorize switches based on MMICS FET switches available in chip form. The connectorized package is required to make the switch suitable for practical use throughout the 6-18 GHz frequency range.

该子项目是利用NIH/NCRR资助的中心赠款提供的资源的许多研究子项目之一。子弹和调查员（PI）可能已经从其他NIH来源获得了主要资金，因此可以在其他清晰的条目中代表。列出的机构适用于该中心，这不一定是调查员的机构。在FT-ESR和DQC ESR中，我们使用了几纳秒宽度的微波脉冲。这种脉冲的产生需要使用非常快速的微波开关。我们从几家供应商那里购买了市场上最快的开关。它们基于不同类型的快速销钉。我们发现，在上升时间的开关速度限制为1-1.5 ns，并且降低了1.5-3.5 ns跌落时间的更大值。此外，在较短的边缘上观察到抖动。我们需要更快，更稳定的切换，而上升和秋季的时间比1 ns和可忽略的视频瞬变短。同样，很难使用Pin-Diode开关将两个短脉冲彼此接近。我们成功地测试了基于MMIC技术的开关，具有提高的性能特征，并在最佳条件下在1 ns的两个方向上切换。这种类型的开关需要一个非常快速的驱动器，能够以少于1 ns和300 MHz的数据速率生成6 V的电压波动。这很具有挑战性，但我们接近解决这个问题的解决方案。为了最大程度地减少切换时间并将抖动降低到微不足道的水平，使用表面安装技术和电线键合技术需要将开关与驱动程序集成在一起。这个待处理项目的进一步进展取决于基于MMICS FET开关所需的资金可用性，以芯片形式可用。需要连接包装以使开关适合在6-18 GHz频率范围内实际使用。