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Home > Mall Dynamic > Component Science | What Is The Role OF The Resonator
When we use electronic products in our lives, we cannot do without the transmission and reception of frequencies, and the transmission and reception of frequencies require such an electronic component: a resonator. Resonator refers to the generation of resonant frequency of electronic components, commonly used quartz crystal resonator and ceramic resonator, this article will be popular science for the role of these common resonators and advantages and disadvantages.
It has the characteristics of stability and good anti-interference performance, and is widely used in various electronic products. The frequency accuracy of quartz crystal resonators is higher than that of ceramic resonators, but the cost is also higher than that of ceramic resonators. Resonators mainly play the role of frequency control, and all electronic products involving frequency transmission and reception need resonators. The type of resonator can be divided into two types according to the shape of the in-line and the chip type.
Quartz crystal resonator is also known as quartz crystal, commonly known as crystal oscillator, is the use of quartz products made of the piezoelectric effect of the resonant element, with semiconductor devices and resistance and capacitance components used together, can form a quartz crystal oscillator.
The application of mechanical force to some dielectrics causes the relative displacement of their internal positive and negative charge centers, resulting in polarization, resulting in the opposite symbol of the bound charge in the surface of both ends of the medium, within a certain range of stress, the mechanical force and charge are linear reversible relationship, this phenomenon is called the piezoelectric effect.
Provide system oscillation pulse, stabilize frequency, select frequency.
Nominal frequency: the resonant center frequency of a crystal oscillator under specified conditions.
Adjustment frequency difference: under specified conditions, the operating frequency at the reference temperature is the maximum deviation from the nominal frequency.
Temperature frequency difference: The allowable deviation of the operating frequency relative to the reference temperature in the entire operating temperature range under specified conditions.
Load resonance resistance: The resistance value of the crystal oscillator in series with the specified external capacitor at the load resonance frequency.
Load capacitance: refers to the effective external capacitance that determines the load resonance frequency together with the crystal oscillator, and the commonly used standard values are :12pF, 16pF, 20pF, 30pF.
Ceramic oscillators use highly stable piezoelectric ceramics composed primarily of lead zirconate titanate (PZT) as mechanical resonators. When a voltage is applied, deformation occurs due to the piezoelectric effect, and resonance occurs at a specific frequency. The resonant frequency is determined by the vibration mode and the size (length, thickness) of the ceramic substrate. Because it is smaller and cheaper than the crystal unit, it is often used as a reference clock or signal source in electronic circuits instead of the bulk unit. However, its frequency accuracy is poor, so it is limited to circuits that do not require high accuracy (the frequency accuracy of the crystal is 0.001% error, but in the PZT is 0.5%).
Resonator when the natural frequency is close to equal can get the maximum amplitude, we use the radio in life, when the radio is the IC loop natural frequency and transmission frequency is consistent, in the IC loop can get the maximum amplitude signal, so as to receive a clear sound, Usually tuning is to change the size of the inductance or capacitance of the IC loop to achieve a change in the natural frequency of the loop to achieve tuning selection, the resonator is to let a frequency signal through, block other frequency signals, the signal passes smoothly just like through a small resistor (or wire), when the purpose of selection is achieved, when the signal frequency and the natural frequency of the resonator are equal, The frequency away from the natural resonant frequency tries to pass through it like a large impedance.
Compared with crystals, ceramic resonators cost half as much and are smaller.
Lack of frequency and temperature stability compared to crystals. Its accuracy is poor, probably between 1% and 0.1%. To summarize: The typical initial accuracy of ceramic resonators is in the range of 0.5% to 0.1%, and drift due to aging or temperature changes may change this accuracy range. Cheap ceramic resonators have tolerances of only ±1.1%, while higher-end automotive accuracies are ±0.25% and +0.3%, respectively. Future applications are automotive CAN(Controller Local Area Network) bus applications with operating temperatures from -40°C to +125° C. Low cost ceramic resonators with frequencies from 200 KHZ to about 1 GHZ are suitable for embedded systems with less stringent timing requirements. Ceramic devices start faster and are generally smaller than quartz devices. They are also better able to withstand shock and vibration.
Above is this popular science, hope to help you better understand the role of the resonator, as well as the quartz crystal resonator and ceramic resonator of the two components of their respective advantages and disadvantages, above is the whole content of this article, if you feel that this article is helpful to you, please continue to pay attention to "Mr. I" website and "Mr. IC" wechat public number, We will bring you more news information and knowledge popularization!
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