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Analysis, Design and Assessment of Class A, B, AB, G and H Audio Power Amplifier Output Stages Based on Matlab Software

A procedure for analyzing, designing and assessing audio power amplifier output stages operating in class A, B, AB, G and H with reactive loads is presented. This study considers steady-state sinusoidal analysis for BJT, IGBT and MOSFET technologies. Electrical-mechanical-acoustical models of loudspeakers and enclosures are used whose parameters are obtained through the Thiele-Small model. An equivalent electrical-thermal model for the transistor-heatsink-ambience associated with the instantaneous and average powers is used for designing the power stage. A MATLAB software has been developed, which provides a considerable support to the designer for all required phases in an audio power amplifier output stage design.

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