There are two main types of crystal oscillators: active crystal oscillators and passive crystal oscillators

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There are two main types of crystal oscillators: active crystal oscillators and passive crystal oscillators [Copy link]

There are two main types of crystal oscillators: active crystal oscillators and passive crystal oscillators

The self-oscillation characteristics of active crystal oscillators and the requirements for the use of passive crystal oscillators. The content involves the internal structure of crystal oscillators, especially the piezoelectric effect of quartz crystals and their role in mechanical vibration.

· Crystal classification

Generally, crystal oscillators are divided into two types: active crystal oscillators and passive crystal oscillators.

Active crystal oscillator is also called crystal oscillator, Oscillator;

Passive crystal oscillator is also called passive crystal, Crystal, crystal resonator.

Simply put, an active crystal oscillator can output an oscillation signal by supplying itself with power; a passive crystal must have additional circuits to oscillate.

The above classification is from the perspective of use. From the perspective of internal structure, active crystal oscillators integrate drive circuits (such as amplifiers, load capacitors, etc.) on the basis of passive crystal oscillators, and realize the functions of signal amplification and stable output through packaging. Passive crystal oscillators act as frequency references in the circuit, while the drive circuit further optimizes and standardizes the output signal so that it can meet a wider range of application requirements. Due to the integration of the drive circuit and the complexity of the package, the manufacturing cost of active crystal oscillators is usually higher than that of passive crystal oscillators.

It can be understood that the active crystal oscillator is based on the reference oscillation frequency provided by the passive crystal oscillator, and further improves the function through additional circuits to form a plug-and-play oscillation signal output device. Only power is required, and the active crystal oscillator can output a stable frequency signal, thereby simplifying the design of downstream circuits.