Crystals have long been used in both scientific applications and life in general. One of them, the GL120F23IET crystal, is a type especially suited for telecom applications. This article explores its application field and working principle in detail.

Application Field

The GL120F23IET has a wide range of applications in the telecom infrastructure, including CDMA, GSM, PCS, UMTS, and Rel-6 systems. It can be used in oscillators, PLLs, filters, and RF power amplifiers. It also can be used in antenna tuners, to mitigate the effects of temperature variation on the antenna parameters.

The GL120F23IET crystal also allows for control over the external temperature. This allows the oscillator which includes the GL120F23IET to be used reliably in environments where temperature can vary significantly.

Working Principle

A crystal oscillator is a circuit that produces a continuous, stable, and periodic output waveform. It is based on the properties of piezoelectricity of certain materials. The GL120F23IET consists of a quartz crystal, which is mounted into a metal container, and it is cut into a specific shape in order to produce a steady frequency.

When a voltage is applied to the crystal, it produces an alternating current, due to its piezoelectric properties. This alternating current, in turn, creates a mechanical vibration of the crystal director, which depends on its cuts and their orientations. The GL120F23IET is cut in such a way that it vibrates in a very specific frequency, which is determined by its cuts.

In addition, the GL120F23IET crystal has an inherent frequency temperature stability, which allows the crystal to maintain its output frequency under varying temperatures. This stability is further improved with modern temperature compensation circuits, which further reduces the impact of ambient temperature on the frequency of the oscillator.

Conclusion

The GL120F23IET crystal is an ideal application for telecom infrastructure, due to its wide range of applications, low temperature sensitivity, and excellent frequency temperature stability. Its working principle is based on the piezoelectric properties of quartz crystals, and its output frequency is determined by the shape and orientation of its crystals.