Re: MEMS gyro: offset drift


"Marco Trapanese" <marcotrapaneseNOSPAM@xxxxxxxxx> wrote in message
news:p1BTi.152777$U01.1113008@xxxxxxxxxxxxxxxxxxxxx
Ben Jackson wrote:

[snip]

Even given all that, you'll need some absolute input to keep the system
zeroed. If that input is good enough that you can "mix" it in at a high
rate, temperature compensation will be irrelevant.

That's correct.

So I'm gonna characterize some gyros over temperature and see what
happens.

Another problem is I can't do another calibration before one or more
years...

What's about the long-term drift (excluding temperature of course) ?

I may stick a resistor on the chip to maintain it at (about) constant
temperature. Perhaps I don't need the temp calibration at all.


you can do that, it can be used to good effect in crystal oscillators,
its best to use temp feedback control,
I think you mentioned it had a temperature output,
you can use a mosfet instead of the resistor to heat the device
driven by a op amp with current control to keep the temp at a set level.

you need to make sure the control temp is always going to be above
what it would otherwise be without heating.

Colin =^.^=


.

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