Does the Thickness of the Chip Affect the Frequency of the Crystal Oscillator?
Crystal oscillator is an electronic component that can generate stable frequencies and is widely used in various electronic devices. The frequency parameter of a crystal oscillator, that is, the magnitude of its oscillation frequency, is one of the important indicators of crystal oscillator performance. The cutting method of quartz crystals is crucial. Different cutting methods, such as AT cut, CT cut, SC cut, etc., have a profound impact on the vibration mode, frequency stability, and temperature coefficient characteristics of crystals.
The thickness of the chip is one of the key factors determining the frequency parameters of the crystal oscillator. The thinner the chip, the higher its oscillation frequency. This is because the thickness of the chip determines the characteristics of its vibration mode. Under the same excitation conditions, thinner chips are more likely to generate high-frequency vibrations. For example, a 40MHz crystal oscillator typically requires a chip thickness of around 41.75 microns, while to achieve a frequency of 100MHz, the chip thickness needs to be reduced to around 16.7 microns.
However, the reduction in chip thickness is not without limitations. Due to limitations in process technology and mechanical strength requirements of chip materials, chips cannot be made thinner without limitations. Thin chips are prone to breakage or damage during vibration, which affects the stability and reliability of crystal oscillators.
In order to achieve higher frequency parameters, in addition to reducing the chip thickness, the method of using overtone crystals can also be used. A overtone crystal refers to a specific excitation method that causes the chip to produce higher-order overtone vibrations, thereby achieving higher frequencies. For example, a 20MHz fundamental frequency chip can achieve a stable oscillation frequency of 100MHz through five overtones. This method can effectively expand the frequency range of crystal oscillators to meet higher frequency application requirements.
The thickness of the chip is one of the important factors affecting the frequency parameters of the crystal oscillator. By reasonably controlling the chip thickness and using overtone technology, high-frequency and stable oscillation of crystal oscillators can be achieved, meeting the strict requirements of various electronic devices for frequency parameters.
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