Lesson 7 – Executing the DAC Distortion Test
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7-1 DAC Distortion Measurements
DAC distortion is usually measured by sourcing a digital sine
wave. The analog response is first captured and then analyzed in
the frequency domain. This means, the processed waveform is
converted into its spectrum using the FFT algorithm, and the
calculations are based on the frequency components.
DAC distortion measurements include:
DAC Dynamic Parameters (Distortion)
NOTE
THD, SND, SNR, and SFDR are defined and calculated in the same
way for DACs, ADCs and buffers.
•Total harmonic distortion (THD)
•Signal-to-noise plus distortion (SND)
•Signal-to-noise ratio (SNR)
•Spurious free dynamic range (SFDR)
•Signal resolution
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