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How is the crystal oscillator laid out on the PCB?
How is the crystal oscillator laid out on the PCB?
Crystal oscillators generally refer to two types of quartz crystal oscillators and quartz crystal resonators, and can also be directly called crystal oscillators. They are all made using the piezoelectric effect of quartz crystals.
Its working principle is as follows: when an electric field is applied to the two electrodes of the crystal, the crystal will undergo mechanical deformation. Conversely, if mechanical pressure is applied to both ends of the crystal, the crystal will generate an electric field again. This phenomenon is reversible, so using this property of the crystal, applying an alternating voltage across the crystal will cause the wafer to vibrate mechanically and at the same time generate an alternating electric field. However, the vibration and electric field generated by the crystal are generally very small, but as long as it is at a certain frequency, the amplitude will increase significantly, just like the LC circuit resonance that our circuit designers often see.
Single serial port server
WIFI serial server
Signal interface conversion
Ethernet
CAN module
Crystal oscillator classification:
① Passive crystal oscillator
The passive crystal oscillator is a crystal, generally a 2-pin non-polar device (some passive crystal oscillators have non-polar fixed pins).
Passive crystal oscillators generally require the help of a clock circuit formed by a load capacitor to generate an oscillating signal (sine wave signal).
②Active crystal oscillator
Active crystal oscillators are oscillators, usually 4 pins. The active crystal oscillator does not require the CPU's internal oscillator and generates a square wave signal. An active crystal oscillator power supply can generate a clock signal.
The signal of the active crystal oscillator is stable, the quality is better, and the connection method is relatively simple, The accuracy error is smaller than that of a passive crystal oscillator, and the price is more expensive than the passive crystal oscillator.
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