What is an Oscillator? 什么是振荡器？

What is an Oscillator? An oscillator provides a source of repetitive A.C. signal across its output terminals without needing any input (except a D.C. supply). The signal generated by the oscillator is usually of constant amplitude. The wave shape and amplitude are determined by the design of the oscillator circuit and choice of component values.

什么是振荡器？振荡器在其输出端上提供重复交流信号源，而无需任何输入（直流电源除外）。振荡器产生的信号通常具有恒定的幅度。波形和振幅由振荡器电路的设计和元件值的选择决定。

什么是Crystal Oscillator（晶体振荡器）？

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 very 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.

晶体振荡器是一种电子振荡器电路，它利用具备压电特性的晶体（石英晶片）机械共振来产生频率非常精确的电信号。该频率通常用于跟踪时间（如石英手表），为数字集成电路提供稳定的时钟信号，以及稳定无线电发射器和接收器的频率。

（晶体振荡电路）

在产品目录中，晶体振荡器指的则是内含最佳匹配振荡电路的有源晶振。

下图为常规有源晶振测试电路：