If using an external crystal, make sure the crystal traces are short and are protected by ground plane.
如果使用外部晶振，确保晶体的痕迹很短，是由地平面的保护。
By using piezoresistive resonators the need for an external crystal can be avoided, enabling greater integration and lower costs.
通过使用压阻式谐振器，可以避免需要使用外部晶体，这允许更大的集成以及使成本更低。
The external quantum efficiency of photon crystal(PHC) structured LED is calculated.
对光子晶体结构的外量子效率进行了计算。
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