What is a Crystal oscillator?

A crystal oscillator is a device that generates a certain frequency by incorporating an oscillation circuit in the mechanical resonance of a crystal oscillator (quartz) that uses the piezoelectric phenomenon of crystal. Oscillation circuits other than crystal include LC oscillation, CR oscillation, and oscillation using ceramic elements. In the case of crystal oscillation, high accuracy on the order of ppm (strict quality control that does not allow even one defect in a million pieces) can be obtained. is excellent.

A crystal oscillator is a device that uses a crystal resonator (quartz) as a reference resonator and generates a reference frequency signal by an oscillation circuit. Crystal resonators function by utilizing piezoelectric phenomena, but alone they cannot maintain the amplitude needed to maintain the resonant frequency. Therefore, crystal oscillators have built-in oscillation circuits that utilize the resonant frequency of the resonator to stabilize the signal strength and frequency. This is the basic operating principle of a crystal oscillator.

The crystal used in crystal resonators is made of quartz (SiO2: silicon dioxide), but the one used in oscillators is artificial crystal. This artificial crystal is made from Laska, a natural crystal. Laska is placed in an autoclave (high pressure container) filled with alkaline solution and dissolved under high temperature and pressure. By controlling the temperature and generating natural convection, we create large, highly pure, recrystallized artificial crystals. Cut this thinly and use it for a crystal oscillator.

Application of Crystal oscillator

Crystal oscillators, which are based on crystal vibration, have been used as frequency signal sources for communication equipment, timing sources for clocks (quartz), and color burst signal sources for televisions. In recent years, a huge number of them are used as fixed-frequency clock sources for digital circuits.

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