A crystal oscillator is an abbreviation for a crystal oscillator, and it can be electrically equivalent to a two-terminal network in which a capacitor and a resistor are connected in parallel and a capacitor is connected in series. Electrotechnics has two resonance points in this network, with the frequency being high and low, where the lower frequency is the series resonance; the higher frequency is the parallel resonance. Due to the crystal's own characteristics, the distances between the two frequencies are quite close. In this extremely narrow frequency range, the crystal oscillator is equivalent to an inductor. Therefore, as long as the crystal capacitor is connected in parallel with suitable capacitance, it will constitute a parallel resonant circuit. . The parallel resonant circuit is added to a negative feedback circuit to constitute a sine wave oscillation circuit. Since the frequency range of the crystal equivalent to the inductance is very narrow, even if the parameters of other components greatly vary, the frequency of this oscillator will not a big change.
Crystal oscillator has an important parameter, that is load capacitance, the general crystal's load capacitance is 10PF or 20pF. Choose the shunt capacitor with the same load capacitance value, you can get the crystal's nominal resonant frequency. The general crystal oscillation circuit is connected to the crystal oscillator at both ends of an inverting amplifier. Two capacitors are respectively connected to two ends of the crystal oscillator. The other end of each capacitor is connected to the ground again. The capacity of the two capacitors is connected in series. The value should be equal to the load capacitance. Please note that the pins of the general IC have equivalent input capacitance. This cannot be ignored.
Both quartz crystal oscillators and quartz crystal resonators are an electronic device that provides a stable circuit frequency. The quartz crystal oscillator uses the piezoelectric effect of the quartz crystal to start the vibration, and the quartz crystal resonator works by using the quartz crystal and the built-in IC to work together. The oscillator is directly applied to the circuit. When the resonator is operating, it is generally required to provide 3.3V to maintain the operation. The oscillator has one more important technical parameter than the resonator. The resonator has no resistance requirements. The size of the RR directly affects the performance of the circuit and is also an important parameter for each merchant's competition.
Crystal oscillator is the most important component in the circuit. Its main function is to provide reference frequency to various parts of the video card, network card, motherboard, etc. It is like a ruler. The unstable working frequency will cause the operating frequency of the related equipment to be unstable and natural. problem appear. The crystal also has a role in generating oscillating currents in the circuit and issuing a clock signal.
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