资 源 简 介
如何以及为什么使用PIN二极管的射频开关
开关射频电源在便携式应用中是具有挑战性的机电开关由于尺寸，成本和速度的考虑。虽然PIN二极管提供了一些独特的优势相对于其他非机械的选择，如CMOS开关和MEMS结构，他们很难设计成一个电路，除非他们的特点是清楚地理解。
本文将介绍射频开关的挑战，并描述PIN二极管操作的基本知识。然后，它将显示如何设计与PIN二极管，然后提供一些现实世界的PIN二极管的例子，以显示该技术是如何推进。
The RF switching challenge
In many applicaTIons， it is necessary to switch the RF signal path to route and connect to different antennas， amplifiers， and filters. This need for more switching with higher performance is only growing with the development of MIMO， mulTIband wireless devices （5G）， and other advanced technologies， especially for portable and battery-powered devices.
Since these switches must work into the gigahertz region and higher， nothing about them is simple： their design， their underlying technology， the layout on the PC board， or matching their performance to the applicaTIon prioriTIes.
Each of these technologies offers tradeoffs in key performance parameters such as bandwidth， insertion loss， isolation， switching speed， and power handling （Figure 1）。
（Note： “hybrid” switches combine PIN diodes and FET-based components.）
