This modulated PWM audio signal is efficiently amplified by the output devices such as MOSFETs or BJTs and then converted back into high power analogue version using special inductors across the connected loudspeakers. It is because they convert the analogue audio signal into equivalent PWM modulated content. Because it can perform at high efficiencies, a Class-D amplifier has become a favorite concept for mobile and public address applications where distortion is negligible.
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