晶诺威科技产晶体振荡器：SPXO、VCXO、TCXO、OCXO之间有何区别？

—What are the differences between an SPXO, VCXO, TCXO, OCXO?

1、SPXO – Simple Packaged Crystal Oscillator SPXO – 简单封装晶体振荡器

An SPXO or a Simple Clock Oscillator is the most basic type of oscillator and consists of a crystal and a basic drive circuit. Since there is no form of compensation the frequency/ temperature stability is essentially that of the crystal itself – typically ±50ppm.

SPXO 或简易时钟振荡器是最基本的振荡器类型，由一个晶体和一个基本驱动电路组成。由于没有补偿形式，频率/温度稳定性基本上取决于晶体本身——通常为±50ppm。

2、VCXO – Voltage Controlled Crystal Oscillator VCXO – 电压控制晶体振荡器

A VCXO relies on the inherent pullability of the quartz crystal to allow the output frequency of the oscillator to be changed by applying an external voltage. This change is limited to a few tens of ppm, typically ±100ppm. As with SPXO’s, the frequency/ temperature stability is that of the crystal itself.

VCXO依赖石英晶体固有的拉伸性，通过施加外部电压来改变振荡器的输出频率。这种变化通常限制在几十ppm，通常是±100ppm。与SPXO一样，频率/温度稳定性取决于晶体本身。

3、TCXO – Temperature Compensated Crystal Oscillators TCXO – 温度补偿晶体振荡器

Where the stability of the crystal is not sufficient it may be necessary to use a TCXO. This type of device is used where the stability of a basic quartz crystal is insufficient. Typically, TCXO’s can achieve a stability of less than ±1ppm in preference to a typical crystal of 30ppm.

当晶体稳定性不足时，可能需要使用TCXO。这种装置用于石英晶体稳定性不足的情况。通常，TCXO的稳定性可控制在±1ppm以内，大大优于典型的 ±30ppm晶体。

4、OCXO – Oven Controlled Crystal Oscillators OCXO – 烤箱控制恒温晶体振荡器

The “ultimate” piezoelectric product is the OCXO, it offers performances of typically 3E10-9. In applications where high stability is required then this type of product should be considered.

“终极”压电产品是OCXO，性能通常属于3E10-9。在需要高稳定性的应用中，应考虑此类产品。