Distortion: percent ↔ dB
Convert THD, THD+N or noise figures between percent, dB, ratio and ppm.
%
dB
×
ppm
THD figures are amplitude (voltage) ratios: 1 % = −40 dB, 0.1 % = −60 dB, 0.01 % = −80 dB.
How it works
Distortion is the level of unwanted harmonics relative to the fundamental. Datasheets give it in percent or in dB; both describe the same amplitude ratio.
Formulas
- dB = 20 · log₁₀( % / 100 )
- % = 100 · 10^(dB / 20)
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