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AN2583 Datasheet(PDF) 5 Page - STMicroelectronics |
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AN2583 Datasheet(HTML) 5 Page - STMicroelectronics |
5 / 18 page AN2583 Audio characteristics 5/18 Figure 4. Harmonics 2.1.1 Total harmonic distortion The Total Harmonic Distortion, THD, is a measure of the linearity or purity of the amplification process and indicates to what extent the artifacts occur. A pure sine wave is input to the amplifier and the spectrum of the output is determined. The THD figure is a comparison of the output power or voltage levels of the harmonics to the fundamental. Figure 5 illustrates an example output spectrum. P1 is the fundamental frequency while P2 to P7 are the harmonics. The THD figure establishes the fraction of the output signal which is harmonics. Figure 5. Power output spectrum There are two methods used to calculate the THD. The first method compares the power of the harmonics to the fundamental. ai13930 0 f (V OUT ) VOUT, FUNDAMENTAL f0 2f0 3f0 4f0 5f0 6f0 7f0 F VOUT ODD HARMONICS VOUT EVEN HARMONICS 0 f (POUT) f0 2f0 3f0 4f0 5f0 6f0 7f0 F P1 P2 P3 P4 P5 P6 P7 ai13931 1 7 6 5 4 3 2 P P P P P P P P frequency l fundamenta of power powers harmonic THD L + + + + + + = = ∑ |
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