博客
Crystal oscillator （晶体振荡器）
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A crystal oscillator is an electronic oscillator circuit that uses the mechanical resonance of a vibrating crystal of piezoelectric material to create an electrical signal with a precise frequency. This frequency is commonly used to keep track of time, as in quartz wristwatches, to provide a stable clock signal for digital integrated circuits, and to stabilize frequencies for radio transmitters and receivers. The most common type of piezoelectric resonator used is the quartz crystal, so oscillator circuits incorporating them became known as crystal oscillators, but other piezoelectric materials including polycrystalline ceramics are used in similar circuits.
晶体谐振器（振荡器）属于电子振荡电路的一种，其借助压电材料的特性，即由振荡的晶体的机械共振产生一个精确的电信号频率。通常用于记录时间，如在石英手表中，其通常能为数字集成电路提供一个稳定的时钟信号；也可用于无线电发射机和接收机。石英晶体是最常见，也是常用的压电谐振器。因此，一些使用了石英晶体的振荡电路常被称为晶体谐振器。另外还有一些压电材料，包括多晶陶瓷也被应用在相似的电路中。
Quartz crystals are manufactured for frequencies from a few tens of kilohertz to hundreds of megahertz. More than two billion crystals are manufactured annually. Most are used for consumer devices such as wristwatches, clocks, radios, computers, and cellphones. Quartz crystals are also found inside test and measurement equipment, such as counters, signal generators, and oscilloscopes.
加工成型的石英晶体的频率可从几十千赫兹到数百兆赫兹。每年生产的石英晶体的总量超过二十亿个！大多数被用于消费性产品，诸如手表、时钟、收音机及移动电话。在测试测量设备中也有它们的身影，例如计数器、信号发生器及示波器。
