Lesson 7 – Executing the DAC Distortion Test
276
Coherent Sampling
In order to obtain a pure spectrum, coherent sampling has to be
established.
Sampling Parameters and FFT
When setting up coherent sampling, the following condition must
be met.
Condition for Coherent Sampling
Unit Test Period (UTP)
Mcycles = 3
N
points = 16
1/F
in
1/Fsample
Nyquist
Frequency
1/UTP
Fsample
2
Fundamental
Frequency
DC
2nd
Harmonic
Fin
Mcycles = 3
Npoints / 2 = 8
F
sample
Fin
=
Mcycles
Npoints
FFT
Coherent Sampling
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