We use ADIS16265 and ADIS16364 gyros, depending on our needs. I am trying to calculate gyro noise performance based on our choice of filter taps, and SMPL_PRD settings.

I know that output noise = noise_rate_density X sqrt(equivalent noise bandwidth)

However, I don't know how to calculate equivalent bandwidth for a Bartlett FIR with taps. Also I don't know how the math works with the SMPL_PRD setting and equivalent BW when using the Bartlett filter.

Thus I am unable to calculate output noise for our choice of settings versus alternative settings. I've tried but haven't been able to discover the math behind your output noise values on the 16265 datasheet (16364 doesn't have any tap examples on datasheet).

Hello Bill,

Thank you for using the ADIS16265 and ADIS16364. The attachment provides a approximation method for calculating the Bartlett FIR response, along with the resulting noise. Here are the approximations used in this analysis:

If you find that these numbers do not agree with your measurements, let's continue the discussion to find out how we can refine the analysis to better meet your needs. I hope that this helps and look forward to hearing back from you.

Best,

NevadaMark

NOTE: Removed the attachment, in preference to the more recent spreadsheet in this discussion.

Message was edited by: Mark Looney