PRINTED CIRCUIT BOARD DESIGN OF A RF OSCILLATOR

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。 在BU/NCRR质谱源中预先构建了高压RF振荡器电路。这种坚固的、可调谐的射频振荡器电路可以用来廉价地驱动FTICR中的多极离子导轨。该项目包括为振荡器电路设计印刷电路板，以简化结构并最大限度地减少这些电路的调试。电路使用Cadence Inc.的CAD工具Layout Plus在2层印刷电路板上布设。电路板轮廓为5 x 4(英寸)。携带大电流的迹线散热很大(i2*R*t)。这些被加宽，以防止铜轨迹的熔化。此外，处于高电势(约300伏射频)会导致相邻轨道之间的弧化或绝缘击穿。为了防止这种情况，增加了这些H.V.迹线之间的间距(约射频为200密耳，直流为100密耳)。还应记住，在电路布局中保持RF组件与DC组件分开。已经开发并测试了一块印刷电路板，其中几块已经组装完成。目前，我们正在考虑修改电路，以增加最近公布的稳频和钳位电路，因为当我们决定调整该振荡器以适应RF/DC操作时，它们似乎将在未来有用。 一篇关于这项工作的论文发表在《科学仪器评论》上。

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. A high voltage RF oscillator circuit was previously constructed in the BU/NCRR mass spectrometry resource. This robust, tunable RF oscillator circuit could be used to cheaply drive multipole ion guides in FTICR. This project involved designing of a printed circuit board for the oscillator circuit in order to simplify construction and minimize debugging of these circuits. The circuit is laid out on a 2 layer PCB using the CAD tool, Layout Plus by Cadence Inc. The board outline is 5 by 4 (inches). The traces carrying high current dissipate a lot of heat (i2* R*t). These are made wider to prevent the melting of Cu tracks. Also, the nets which are at high potential (approx. 300 volts RF) can cause arcing or insulation breakdown between adjacent tracks. To prevent this, spacing between these H.V. traces is increased (approx. 200 mils for RF and 100 mils for DC). It has also been kept in mind to keep the RF components separate from the DC components in the layout of the circuit. A PCB has been developed, and tested, and several of them have been assembled. Currently, we are considering modifying the circuit to add a frequency stabilization and clamp circuit that were recently published as they appear that they will be useful in the future when we decide to adjust this oscillator for RF/DC operation. A paper was published in Reviews of Scientific Instrumentation regarding this work.