What's Inside a Quartz Crystal Resonator
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- Опубликовано: 16 сен 2024
- In this concise RUclips video, I reveal what's inside some quartz crystal resonators - a quartz crystal resonator teardown. We look inside some old quartz crystals, some not so old ones and some new ones including a surface mount quartz crystal resonator.
From old to new, quartz crystal resonators come in all shapes and sizes. They're used in all manner of electronic circuits providing high quality resonators to give stable and accurate signals for use as clock oscillators in computer, processor and logic circuits. They're also widely used in RF designs as oscillator resonant elements and in filters.
As the circuit symbol implies, they contain a slice of quartz crystal which is held between two electrodes.
So to investigate more about them, I took an old 1940s crystal apart and as I hope you can make out there is the slice of quartz between two metal electrodes. You see a teardown.
There are many modern crystals as well. From the larger ones to very small surface mount ones.
I broke into one. The metal can is sealed and its filled with an inert gas such as nitrogen.
We even looked inside a specialised SMD quartz crystal with a ceramic base.
We'd like to thank our friends at IQD Frequency Products Ltd for their help in supply the modern crystals and for taking apart the SMD one. They were very helpful and knowledgeable. www.iqdfrequen...
More information so you can understand about quartz crystal resonators can be found at: www.electronic...
Information about the operation and vibrational mechanisms:
www.electronic...
Information about how to specify a quartz crystal: www.electronic...
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I have already subscribed when I saw the quality of technical expertise. Even as a virtual novice to electronics I recognise in depth knowledge of the subject matter. Regardless sir, if I may. Why do crystal oscillators operate at such high frequency, are there non capable of operating in the hertz region? Why must they all operate in mhz/ghz? Thank you sir.
They operate at frequencies that are normally above 1 MHz because of the physical sizes needed. The crystals use physical vibrations and resonances - to get very low frequency resonances, they would need to be very large.
I wonder, why the crystal oscillator doesn't generate a pure sine wave?
It should produce a pretty good signal - it will be spurious products that will give distortion. So may be there is too much feedback in the circuit.
That said, so crystal oscillator units are designed to give a digital square waveform out. They take the basic sine wave and square it up so that it can act as a clock oscillator for a logic / digital circuit.
@@ElectronicsNotes so the reason would be the analog to digital conversion? thats pretty neat!
Well it's not digital to analogue in the conventional meaning of the terminology. It is just that the waveform is often squared up so it can interface to digital circuits.