On 8/5/18 11:22 PM, Poul-Henning Kamp wrote:
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In message <84a802ff-88f1-5f50-1f79-71d8ba3c4...@rubidium.dyndns.org>, Magnus D
anielson writes:
What does exists is a formula for how a single sine spur would produce
ADEV. A FM deviation with low enough modulation index creates two
side-bands of opposite sign but same amplitude.
I find the easiest way to wrap my head around this is to think
about measuring Adev by timing zero-crossings.
<snip>
Depending on the modulation signal, there may be moments where the
zero-crossing is "where it should be", for instance if the modulation
is sine or triangular, but not if it is a signed square wave.
What about doing some sort of fit to the measurement data before
calculating the ADEV? Similar to removing a linear ramp.
basically you'd solve for the three sine parameters (f, phase,
amp/deviation), then remove that from the data, then run the ADEV
calculation.
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