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This paper presents an analytical approach to the problem of accurately determining dissipation and efficiency in class B and AB audio power amplifiers, in the case of both sinusoidal and random signals, where the latter represents a suitable approximation to real music-program signals. The results obtained, summarized in a series of graphs, show that the sinewave approach leads to an overestimation of dissipated power.

Output clipping detection in audio power amplifiers has become widespread. This paper illustrates the mathematics useful to calculate the clipping total harmonic distortion of a sinusoidal signal as well as the relationship between the latter and the output of a clipping detection device. Furthermore, a few circuital solutions are described in connection with a system dimensioning problem.