分析晶振上板测试时不振的原因
本文中汇隆将为大家分析晶振上板测试时不振的原因，希望对各位工程师朋友有所帮助。
原因分析：
1.通常振荡电路在设计时会有一个负性阻值,这个负性阻值通常会与电路的反馈系数、有源元件的放大倍数有关。石英谐振器作为选频元件，本身有一个等效的谐振电阻。这个谐振电阻与谐振器的封装尺寸、频率有关，通常谐振器尺寸越小，谐振电阻越大；频率越低，谐振电阻越大。当电路的负电阻小于石英谐振器电阻的2倍时振荡会变得不稳定。特别是振荡电路的工作电压发生波动，有源元件的和反馈环节的元件值的分散性都会使负阻偏离设计值。
解决的办法：
一是对电路反馈电路进行调整，提高负阻值，二是降低石英谐振器的谐振电阻。通常第一种方法更容易实现，只需要调整Cd，Cg的电容值就可以很容易达成。为保证电路工作正常，建议在进行电路设计时负电阻在石英谐振器电阻的3-10倍左右。在用不同尺寸机种之间切换时需要匹配后确定是否需要调整电路参数。
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本文由三年不鸣转载自汇隆官网，原文标题为:晶振上板测试为何不振，本站所有转载文章系出于传递更多信息之目的，且明确注明来源，不希望被转载的媒体或个人可与我们联系，我们将立即进行删除处理。
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测试范围：扬兴晶振全系列晶体，通过对晶体回路匹配分析，调整频率、驱动功率和起振能力，解决频偏、不起振、干扰、频率错误等问题。技术专家免费分析，测完如有问题，会进一步晶振烧录/修改电路。
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