What is a resonator?
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Recently, Easybom has done an investigation on the resonator, the following contents are what they have found about its nature, classification, coupling, and functions.
The resonator is an electronic component generating resonance frequency and can be divided into quartz crystal resonator and ceramic resonator. It has the characteristics of stability, good anti-interference performance, so it is widely used in various electronic devices.
The frequency accuracy of quartz crystal resonators is much higher than that of the ceramic resonators, and the cost is also higher than that of the ceramic resonators. The resonator is primarily used for controlling frequency.
All electronic devices which are revolved around the transmission and reception of frequency require a resonator. According to the shape, the resonators can be classified into the in-line type and patch type.
Classification of resonators
- Quartz crystal resonator
It is also known as quartz crystal and is commonly known as a crystal oscillator. It is a resonant component made by using the piezoelectric effect of quartz crystal. It is used with semiconductor devices and resistance-capacitance components to form a quartz crystal oscillator.
Piezoelectric effect: The application of mechanical force to certain dielectrics causes the relative displacement of the positive and negative charge centers within them, resulting in polarization. Within a certain stress range, mechanical force and charge represent a linear and reversible relationship. This phenomenon is called the piezoelectric effect.
Functions: Provide system oscillation pulse, stabilize frequency, and select the frequency.
- Ceramic resonator
Ceramic resonator refers to the electronic component encapsulated by the ceramic shell that produces the resonant frequency. It plays the role of generating frequency. Ceramic resonators are widely used in various electronic products due to their stability and good anti-interference performance.
The frequency accuracy of the ceramic resonators is lower than that of quartz crystal resonators, and the cost is also lower than the quartz crystal resonator. It plays an important role in frequency control. Resonators are indispensable for electronic products to transmit and receive frequency.
Coupling of resonator
When the resonator is coupled with the external circuit, there are two situations. On the one hand, the external circuit load is transformed into the ideal resonator circuit, which increases the loss of the resonator and reduces the Q value. On the other hand, a reactance is introduced in the ideal resonator circuit, the resonant frequency is changed, but because the introduced reactance is generally small, only perturbation occurs in the resonant frequency.
Functions of resonator
When the fixed frequencies are close to equal, the maximum amplitude can be obtained. For example, in an amplitude modulation radio, when the fixed frequency of the LC loop is the same as the transmission frequency, the signal with the maximum amplitude can be obtained in the LC loop, so as to receive a clear sound.
The resonator is to let a certain (should be called a certain section) frequency signal pass through and block other frequency signals to achieve the purpose of selection. When the signal frequency is similar to the natural frequency, the signal tries to pass it as a small resistor. When the frequency is far away from the natural resonance frequency, the signal tries to pass it as a large impedance.
With the information given by Easybom, you can have a preliminary understanding of it. Easybom will carry out full research on resonators later, so stay tuned.