I was looking at the noise equation listed in this link:

http://www.analog.com/en/content/td_Accelerometer_Specifications_Definitions/fca.html

where it says Noise = Noise Density * sqrt(BW * 1.6)

where BW is the accelerometer bandwidth, set by capacitors on the accelerometer outputs.

Suppose I use the spec for the ADIS16130 shown here.

http://www.analog.com/en/mems-sensors/mems-gyroscopes/products/index.html

Given a BW of 0.08KHz and density of 0.015 deg/sec/rtHz. Following that equation, I get a noise of

0.015*SQRT(0.08*1000*1.6) = 0.16971 deg/sec,

Somehow that noise number looks kinda high and incorrect to me.

What is that I missed?

Hello tomshong,

I think that you are on the right track. The calculation looks correct. Perhaps we can use the other discussion for a more thorough analysis, but I did want to offer that noise is a key performance metric, but not the only one. For starters, the ADIS16136 is the highest performing, single-axis gyroscope and the ADIS16485 is the highest performance, three-axis gyroscope (IMU).

Best regards,

NevadaMark