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High G force Xtal Oscillator?

时间:04-08 整理:3721RD 点击:
Anyone know of a cheap (commercial quality) crystal oscillator that might be able to withstand 30,000 G's rotational force? Would a ceramic resonator oscillator tend to handle the G forces better?

Don't know if xtal oscillators will survive such acceleration figures, but I would expect microphonics to be a real nightmare. You might have to get in touch with a reputable manufacturer such as Rakon, TechTime etc.
Stay clear of CROs as phase hits/microphonics are their Achilles heal.

It is for an fsk system. Phase noise would have to be pretty degraded for me to care. My primary concern is basic survival. After that, I just need the oscillator to stay in-band enough so the frequency deviation does not fall way outside of the assigned channel.

Have to look for SC cut crystals which can get tens of ppb/G, when AT cuts are 10 times worse.
Ceramic resonators can withstand more shocks and vibration, and probably less sensitive to G forces, but they are not very stable in frequency compared with crystals.

A hand calculation suggests, that usual assembly techniques won't survive the forces, in this case you don't need to worry about the circuit function any more.

Intuitively, I aggree to the assumption of ceramic resonators being more robust, conventional crystal cuts can be sorted out, they depend on rather fragile suspensions, tuning fork crystals, too, I fear. The frequency range matters of course.

But I won't expect data covering the said g region from any series product. At best, you'll find mechanical shock specifications in a 100 g order of magnitude.

The entire assembly will be potted, so the smd parts are going nowhere. My past experience in this area says that the wirebonds inside of plastic package parts will stand up due to their low mass. It is the crystal resonator inside the clock, with its etched surface and possible microcracks, that I worry about.

My thinking was to make a system that is not too frequency sensitive, and go with the more rugged clock source. I am not too sure about the latest resonator construction techniques, but I would also assume that a ceramic resonator would be stronger (more surface-defect free) than a crystal.

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