A Class-D Amplifier, or “switch-mode” amplifier, consists of three stages: the input switching stage, the power amplification stage, and the output filter stage. The signal to be amplified is converted into amplitude pulses, so the active devices switch rapidly back and forth between a fully conductive and nonconductive state. After amplification, the output is converted back to an analog signal by passing through a passive low-pass filter consisting of inductors and capacitors.
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