What is the total harmonic distortion if the amplitude of first harmonic distortion is 20dB, second harmonic distortion 25dB and external noise is 10dB?

What is the total harmonic distortion if the amplitude of first harmonic distortion is 20dB, second harmonic distortion 25dB and external noise is 10dB? Correct Answer 11.25dB

The total harmonic distortion is calculated by the formula given below. Given the first harmonic distortion V1 = 20dB, V2 = 25dB and N = 10dB: THD = (V22 + V32 + … + Vn2)1/2 / V1 = (V22)1/2 / V1 = V2 / V1 = 25 / 20 = 1.25 THD + N = 1.25 + 10 = 11.25dB.
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