石英晶体的基础知识和参数

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石英晶体的概念及常用参数

1、概念

石英晶体，成分SiO2,它不仅是较好的光学材料而且是重要的压电材料，晶体的主要特征是其原子或分子的有规律排列，反映在宏观上是外形对称性。人造水晶在高温高压下结晶而成，在电场的作用下，晶体内部产生应力而形变，从而产生机械振动获得特定的频率，我们利用它的这种逆压电效应来制造石英晶体谐振器。

Quartz crystal, composition is SiO2, it is not only a good

optical materials is important and piezoelectric materials, the

main characteristic of crystal is the regular arrangement of

atoms or molecules, is reflected in the macro appearance of

symmetry. Artificial crystal crystal under high temperature and

high pressure, under the action of electric field, the stress and

deformation is generated in the crystal to produce mechanical

vibration for a specific frequency, we use it to the inverse

piezoelectric effect to manufacturing quartz crystal resonator.

2、频率公差 (FL)

在常温下参考点（25℃）中心频率的偏差值，用最小值和最大值来定义，单位用百分（%）或百分比（ppm)

Reference point at room temperature (25 ℃) center frequency

deviation, with minimum and maximum to define, unit with

percentage (%) or percentage (PPM)

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3、等效电阻 （ESR）

通常我们测量串连谐振频率下的电阻，并联谐振负载下的电阻值称为实际电阻。单位欧姆（Ω）

We usually measure string resonance frequency of the

resistance, parallel resonance under load resistance value is

called the actual resistance. Unit ohm (Ω)

4、负载电容 （CL）

晶体的负载电容是和晶体联合决定工作频率的外部电容，单位皮法（pf)

Crystal load capacitance is jointly decided to working

frequency and crystal, external capacitance unit skin method

(pf) .

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