FAST PFN-BASED DRIVER FOR X-BAND RF CIRCULATOR SWITCH

用于 X 波段射频循环开关的基于 PFN 的快速驱动器

• 批准号: 8363970
• 负责人: CURT R DUNNAM
• 金额: $ 0.05万
• 依托单位: CORNELL UNIVERSITY
• 依托单位国家: 美国
• 财政年份: 2011
• 资助国家: 美国
• 起止时间: 2011-09-01 至 2012-08-31
• 项目状态: 已结题
• 来源: https://reporter.nih.gov/project-details/8363970
• 关键词: Automobile Driving; Characteristics; Charge; Devices; Elements; Evaluation; Frequencies; Funding; Grant; Indium; Modeling; National Center for Research Resources; Network-based; Performance; Physiologic pulse; Principal Investigator; Research; Research Infrastructure; Resources; Solutions; Source; Specific qualifier value; Speed; Technology; Time; United States National Institutes of Health; Vendor; attenuation; base; cost; design; electric impedance; experience; ferrite; improved; meetings; microwave electromagnetic radiation; prospective; radiofrequency; simulation; solid state; voltage

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. In the context of upgrading our X/Ku microwave EPR spectrometers, consideration is being given to improved high-attenuation radiofrequency (r.f.) switching for receiver protection. As described in a prior subproject (SPID 0035), which presents a proposed circulator r.f. switch for 35GHz, we have developed a suitable means of driving a ferrite-based circulator/isolator waveguide r.f. switch on a time scale compatible with our fast pulse spectrometer requirements. A crucial element in realization of this fast r.f. switch subsystem has been the specification and design of a solid-state high-voltage driver capable of delivering an extraordinarily rapid, high value current transition through the switch?s inductive ferrite element. We are now studying the application of this driver/switch technology to receiver protection at lower frequencies. An estimate of the energy required to switch the X/Ku circulator has been made, and we have calculated the driver voltages and currents which must be attained. In order to adequately protect the receiver, our X/Ku spectrometer application requires that the driver should provide around 250 microjoules of switching energy (as opposed to 87 uJ for the Q-band device), in order to reliably switch the circulator ferrite magnitization state. This implies a rectangular pulse FWHM of approximately 25 nsec with a compliance of 1500 volts and a peak value of approximately 56 amperes. Our previous experience in simulation and evaluation of driver parameters for high-speed switching has demonstrated that a discrete pulse-forming network (PFN) would likely be the preferred solution to the challenging driver performance conditions specified. In the prior design analysis, we noted that the PFN's inherent charge/discharge symmetry could also be exploited to provide the needed complementary reset pulse. Of the possible PFN topologies in combination with the various characteristic impedances which we might employ, based on our previous experience we will first investigate simulations of the Type A Guilleman form to determine the source and load impedances which best meet our requirements. We will then characterize the desired circulator switch parameters and progress to a more exacting model based on device specifications returned by prospective vendors. On the basis of this information, we will then conduct a final design refinement of the h.v. switch parameters for the X/Ku receiver protection application.

该子项目是利用资源的众多研究子项目之一 由 NIH/NCRR 资助的中心拨款提供。子项目的主要支持 并且子项目的主要研究者可能是由其他来源提供的， 包括其他 NIH 来源。 子项目可能列出的总成本 代表子项目使用的中心基础设施的估计数量， NCRR 赠款不直接向子项目或子项目工作人员提供资金。 在升级我们的 X/Ku 微波 EPR 光谱仪时，正在考虑改进高衰减射频 (r.f.) 开关以保护接收器。如之前的子项目 (SPID 0035) 中所述，该子项目提出了一种建议的循环器 r.f.为了实现 35GHz 开关，我们开发了一种合适的方法来驱动基于铁氧体的环行器/隔离器波导射频。打开与我们的快速脉冲光谱仪要求兼容的时间尺度。实现这种快速射频的一个关键因素是。开关子系统是固态高压驱动器的规格和设计，能够通过开关的电感铁氧体元件提供异常快速、高值的电流转换。 我们现在正在研究这种驱动器/开关技术在低频接收器保护中的应用。我们已经对切换 X/Ku 循环器所需的能量进行了估计，并且计算了必须达到的驱动器电压和电流。为了充分保护接收器，我们的 X/Ku 光谱仪应用要求驱动器应提供大约 250 微焦耳的开关能量（相对于 Q 波段器件的 87 uJ），以便可靠地切换环行器铁氧体磁化状态。这意味着矩形脉冲 FWHM 约为 25 纳秒，顺应性为 1500 伏，峰值约为 56 安培。我们之前在模拟和评估高速开关驱动器参数方面的经验表明，离散脉冲形成网络 (PFN) 可能是针对指定的具有挑战性的驱动器性能条件的首选解决方案。在之前的设计分析中，我们注意到 PFN 固有的充电/放电对称性也可以用来提供所需的互补复位脉冲。 在可能的 PFN 拓扑结构以及我们可能采用的各种特性阻抗中，根据我们之前的经验，我们将首先研究 A 型 Guilleman 形式的模拟，以确定最能满足我们要求的源阻抗和负载阻抗。然后，我们将描述所需的循环器开关参数，并根据潜在供应商返回的设备规格制定更精确的模型。 根据这些信息，我们将进行高压的最终设计改进。 X/Ku 接收器保护应用的开关参数。