crystal oscillator is generally called crystal resonator, which is a kind of electromechanical device. It is made of Shi Ying crystal with little electrical loss through precise cutting and grinding, plating electrodes and welding leads. This crystal has a very important characteristic. If it is electrified, it will produce mechanical oscillation. On the other hand, if it is given mechanical force, it will generate electricity, which is called electromechanical effect. They have a very important feature, and their oscillation frequency is closely related to their shape, material and cutting direction.
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According to the different requirements and characteristics of crystal oscillator, there are many ways to classify crystal oscillator:
According to the manufacturing materials, it can be divided into Shi Ying crystal oscillator and ceramic crystal oscillator.
according to the shape-it can be divided into rectangular crystal oscillator, circular crystal oscillator and elliptical crystal oscillator.
according to the packaging form, it can be divided into glass vacuum sealed crystal oscillator, metal shell encapsulated crystal oscillator, ceramic shell encapsulated crystal oscillator and plastic shell encapsulated crystal oscillator.
according to the resonant frequency accuracy, it can be divided into high-precision crystal oscillator, medium-precision crystal oscillator and ordinary crystal oscillator.
according to the application characteristics, it can be divided into series resonant crystal oscillator and parallel resonant crystal oscillator.
according to the characteristics of load capacitance, it can be divided into low-load capacitive crystal oscillator and high-load capacitive crystal oscillator.
according to the different functions and implementation technologies of crystal oscillator, crystal oscillator can be divided into temperature compensated crystal oscillator (TCXO), voltage controlled crystal oscillator (VCXO), ordinary crystal oscillator (SPXO) and oven controlled crystal oscillator (OCXO).
the crystal oscillator used in TV can be divided into remote controller, line oscillator circuit, microprocessor circuit, subcarrier circuit and crystal oscillator used in multi-standard sound circuit according to functional circuits.
according to the shape of Shi Ying chip, the crystal oscillator used in electronic clocks can be divided into two types: low-frequency tuning fork type and high-frequency circular chip type. The tuning fork type crystal oscillator has a thin cylindrical shape and the circular chip type crystal oscillator has a flat rectangular shape.
crystal oscillator has a wide range of applications, which can be classified into the following six fields:
1. Communication network-Shi Ying crystal cell is widely used in telephone terminals, program-controlled exchanges, mobile phones, wireless phones, fax machines, wireless communications, microwave communications, satellite communications, communication submarine cable projects and communication underground cable projects. In recent years, with the rapid development of mobile communication, the requirements for low power consumption of Shi Ying crystal components are getting higher and higher, and the miniaturization and chip-type of Shi Ying crystal components have also greatly promoted the miniaturization of single machines.
2. Crystal components are used in household appliances such as color TV sets, refrigerators, microwave ovens, rice cookers, washing machines, air conditioners, etc. Shi Ying crystal components are mainly used in color TV receivers for load frequency recovery oscillators, timing, standard conversion and remote control. Crystal components are also used in audio-visual products such as video recorders, video cameras, VCD\DVD, radios, etc. In addition, crystal components are also indispensable for electronic game machines, walkie-talkies and remote controls.
3, consumer electronics-usually including computers, laptops, cameras, camcorders, headphones, stereos, tablets, etc. Because the development cycle of consumer electronic products is short and the upgrading is fast, the requirements for electronic devices are high integration and reusable modules. Shi Ying crystal components can be widely used in all kinds of medium-sized computers. A multimedia microcomputer acts on about 1 crystal components, and crystal components are used in printers, modems and scanners.
4. Automotive electronics —— In terms of automotive electronics, Shi Ying crystal components are mainly used in automobile navigation, reversing radar, oil control system, tire pressure test and automobile audio system.
5. Medical electronics-Common medical electronic devices include X-ray imaging, magnetic resonance imaging, ultrasonic systems, endoscopes, pacemakers, thermometers, etc. Shi Ying crystal components should also be used. Shi Ying crystal has high frequency stability, and it is also sensitive to temperature and force. The temperature resolution of thermometer using Shi Ying crystal can reach one millionth of Celsius.
6, military avionics-crystal components are needed in the flight control system, display system, photoelectric system, aerial radar and satellite timekeeping module.