Crystal Oscillator

A passive crystal oscillator is a component that generates a stable frequency signal based on the piezoelectric effect of quartz crystals. It requires excitation from an external circuit and forms an oscillating circuit together with an inverting amplifier, etc. in an IC. It consists of a quartz wafer, electrodes and a packaging shell, and has through-hole and surface-mount packaging forms. The important performance parameters include frequency accuracy (the degree of deviation between the actual and nominal frequencies), frequency stability (the ability to maintain frequency stability under different environmental conditions, with temperature having a significant impact), and load capacitance (which needs to be matched with the external to ensure the correct frequency). It is indispensable in electronic devices and is widely used in microprocessor and microcontroller systems to provide clock signals for chips. It is also used in communication, industrial control, consumer electronics and other devices to ensure their normal operation, signal processing and function implementation.

An active crystal oscillator is a component that can independently generate a stable frequency signal. It contains a complete oscillation circuit inside. Based on the piezoelectric effect of quartz crystals, it amplifies and shapes the weak signals of the quartz crystals and then outputs a clock signal. It has a complex structure, integrating multiple components and being hermetically packaged to prevent interference. In terms of performance, it has high frequency accuracy, good stability and is less affected by the environment. It can output various signal types and specific voltage levels. It is widely used in places where the quality of clock signals is required to be extremely high, such as communication base stations and high-speed digital circuits, providing precise and stable clocks for key operations and high-performance chips.

"Programmable" means that parameters such as the output frequency of the crystal oscillator can be programmed and customized at will. It utilizes PLL (Phase-Locked Loop) technology to achieve various target frequencies through frequency division or multiplication by the frequency generator. The characteristics of this type of product are that it is not limited by the frequency and characteristics of the crystal clock source and can meet more diverse and special requirements, featuring rapid delivery and flexible customization.