What is g-sensitivity in an Oscillator? Where are low g-sensitivity oscillators used?什么是振荡器中的g灵敏度？低g灵敏度振荡器在哪里使用？

The change in output frequency of a crystal oscillator due to applied acceleration is called g-Sensitivity. It is also called acceleration sensitivity and is expressed in terms of ppb/g. It is the oscillator’s inherent sensitivity to external forces applied in any direction. As oscillators are used in timing electronics for a wide range of daily applications, precision is an important factor when selecting oscillators. G-sensitivity of the oscillator helps determine the accuracy and resolution sensitivity of oscillators in environments where there can be excessive acceleration. Some areas where this is an important factor include spacecrafts, rockets, airplanes etc.

由于施加加速度而导致晶体振荡器输出频率的变化称为g灵敏度。它也称为加速度灵敏度，以 ppb/g 表示。它是振荡器对施加在任何方向上的外力的固有敏感性。由于振荡器用于各种日常应用的定时电子设备中，因此在选择振荡器时，精度是一个重要因素。振荡器的 G 灵敏度有助于确定振荡器在加速度过大的环境中的精度和分辨率灵敏度。在某些领域这是一个重要因素，其中包括航天器，火箭，飞机等。

Oscillators are electro-mechanical devices that use crystals like quartz in their construction. When a voltage is applied to a crystal it oscillates at a particular frequency. This frequency is reproducible and very accurate. However, a number of real-world factors can cause it to deviate from its ideal value. g-sensitivity is one of those factors. The magnitude of this phase noise or frequency deviation is directly proportional to the amount of force or acceleration applied – the higher the force, the greater the frequency instability and the greater the phase noise induced. Hence, G-sensitivity is key in determining the frequency stability of an oscillator.

振荡器是一种机电设备，在其结构中使用石英等晶体。当电压加到晶体上时，晶体会以特定的频率振荡。这个频率是可重复的，非常准确。然而，一些现实世界的因素可能会导致它偏离其理想值。G敏感性是其中一个因素。这种相位噪声或频率偏差的大小与施加的力或加速度的大小成正比—力越大，频率的不稳定性越大，诱导的相位噪声也越大。因此，G灵敏度是决定振荡器频率稳定性的关键。

There are different types of crystals used in oscillators like AT cut, IT cut, SC cut etc. Quartz crystals have different costs and precision according to their cut type. The SC cut crystal type has lower g-sensitivity due to a stress compensation feature. The g-sensitivity for bulk mode quartz crystal range from less than 1×10^-10 per g for the precisely made SC cut crystal to greater than 1×10^-7 per g for low-cost AT cut crystal type. Hence, the quality of crystals used in oscillators also helps determine their g-sensitivity.

振荡器中使用了不同类型的晶体，如AT切割，IT切割，SC切割等，石英晶体根据其切割类型具有不同的成本和精度。SC切割晶体型由于具有应力补偿功能，g灵敏度较低。块状石英晶体的g灵敏度范围小于1×10^-10每克，用于精确制造的SC切割晶体，大于1×10^-7 每克为低成本AT切割晶体类型。因此，振荡器中使用的晶体质量也有助于确定其g灵敏度。