Zhejiang Pujiang Jingsheng Crystal Co.,Ltd.

Crystal Clock Circuit

Crystal Clock Circuit

Crystal clock circuit is generally composed of crystal oscillator, crystal oscillator control chip and capacitance. Crystal clock circuits are widely used, such as computer clock circuits, electronic watch clock circuits and MP3MP4 clock circuits. A crystal clock circuit is one that produces...

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Crystal clock circuit is generally composed of crystal oscillator, crystal oscillator control chip and capacitance.


Crystal clock circuits are widely used, such as computer clock circuits, electronic watch clock circuits and MP3MP4 clock circuits.


A crystal clock circuit is one that produces oscillations as accurate as a clock. Everything is done in chronological order. The circuit used to generate this time is the clock circuit.


The crystal clock circuit is an oscillating circuit composed of one frequency crystal and other devices.


Crystal oscillator is a device integrated with a complete crystal clock circuit. Add the power supply and ground to output the oscillating waveform. That is, crystal vibration is an integrated crystal clock circuit.


Crystal oscillator is also divided into passive crystal oscillator and active crystal oscillator. The passive crystal oscillator has a different English name from the active crystal oscillator, which is crystal, while the active crystal oscillator is called the oscillator. The idea of "passive crystal vibration" is not accurate because it requires the help of a clock circuit to generate an oscillating signal and cannot oscillate itself. Active crystal oscillator is a complete resonant oscillator.


The reason why quartz crystal can make oscillating circuit (resonance) is based on its piezoelectric effect. It is known from physics that if an electric field is added between two plates of crystal, the crystal will produce mechanical deformation. Conversely, if a mechanical force is applied between the plates, an electric field will be generated in the corresponding direction. This phenomenon is called piezoelectric effect. If the alternating voltage is added between the plates, the mechanical deformation vibration will be generated, and the mechanical deformation vibration will generate the alternating electric field. Generally speaking, this kind of mechanical vibration amplitude is relatively small, its vibration frequency is very stable. However, when the frequency of the applied alternating voltage is the same as the natural frequency of the chip (depending on the size of the chip), the amplitude of mechanical vibration will increase sharply. This phenomenon is called piezoelectric resonance, so quartz crystal is also called quartz crystal resonator. It is characterized by high frequency stability.


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