Switching Power Amplifier

Switching Power Amplifier

A switching amplifier is an electronic amplifier where the active devices are operated as on/off switches. Class D amplifiers are lighter in weight and smaller than standard Class AB amplifiers, because they are more efficient. Class-D amplifiers use MOSFETs(Metal Oxide Semiconductor Field Effect Transistors) and they generate a triangular pulse waveform which is filtered at the output stage with a low pass filter to remove the high frequencies.

Switching Power Amplifiers are often used in sound reinforcement system where a high output is required. The input signal is converted to a sequence of pulses whose average value is directly proportional to the amplitude of the signal at that time. The frequency of the pulses is typically ten or more times the highest frequency of interest in the input signal. The final switching output consists of a train of pulses whose width is a function of the amplitude & frequency of the signal being amplified, and hence these amplifiers are also called PWM amplifiers (Pulse Width Modulation).


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