How to Measure SINAD with DFT

Status
Not open for further replies.
W

wasted11

Newbie level 1
Joined
Aug 25, 2010
Messages
1
Helped
0
Reputation
0
Reaction score
0
Trophy points
1,281
Location
NJ
Activity points
1,287
I have a paper stating that if one is to measure the Total Harmonic Distortion (THD) as a ratio of (input signal amplitude RMS) / (mean[RMS of the first 5 harmonics]) then that is the SINAD for a DFT with Nyquist BW (fsample/2). This is all well, but I have a system with a Anti-Aliasing filter before the DFT that is less than the Nyquist BW. How should I approach the SINAD measurement for this scenario or does it not matter?

Thanks!
 

Status
Not open for further replies.

Similar threads

Menu
Log in
Register
Cookies are required to use this site. You must accept them to continue using the site. Learn more…