Hi all,

Thanks for everyone's help with the gyro questions. For those who wanted
info on the gyors, I have done some additional testing and here is what I
have so far:

As far as noise goes, both MuRata's ENC-03J and Tokin's CG-16D perform
roughly the same. The largest source of "noise", especially in the Tokin
parts, is the residual output of a ~25kHz triangle wave from the signal
that excites the piezo element. This is easily filtered out and you get
down to about a 0.05 deg/sec noise floor.

I don't yet have conclusive information about initial offset error or temp
drift specs. I did some rough testing where I measured the initial offset
(Vout-Vref) on a MuRata ENC-03J and found it to be about 30mV (about 50
deg/sec). I also used a soldering iron and a heatsink to heat up an ENC-03J
to a temp too hot for me to touch the heatsink (not sure what the internal
temp reached). The output only drifted by about 30mV. Vref only drifted by
about 400uV.

Because of the very small Vref drift and the fact that the output noise was
about the same whether I measured differentially between Vref and Vout or
directly between Vout and GND, I think that it is not necessary to use a
differential amp to get a good quality signal out.

I just completed a design and PCB layout for a temperature compensated
gyro/accelerometer test setup with 16bit ADC. When I finish my testing with
this, I should have a lot more info. Let me know if you want me to post
again when I finish that testing.

Sean

|
| Sean Breheny
| Amateur Radio Callsign: KA3YXM
| Electrical Engineering Student
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