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Power amplifier

A power amplifier, which generally uses a plurality of transistors or integrated circuit (IC) devices, is an apparatus that allows an input to control a power source to produce some useful output. Power amplifiers have been widely used as a final stage in multistage amplifiers, such as in audio amplifiers and radio transmitters, to deliver maximum power to a load, rather than maximum voltage gain, for a given percentage of distortion. A power amplifier operates most efficiently when matched to its load. In most power amplifiers, and especially in the high-efficiency types, the tuning network is an integral part of the amplifier and proper tuning is essential for proper operation. In the past, class-A, class-B, and class-AB power amplifiers (that perform linear amplification) have been used as mainstream audio power amplifiers. Since the output transistors of such amplifiers operate in the linear region, they have a low efficiency and dissipate a considerable amount of heat. The basic pulse modulation switching class D power amplifier method in theory provides a much higher efficiency, which lowers the amplifier volume and heat development. The D-class power amplification is an amplifying scheme that uses a modulating process such as pulse width modulation (PWM) or pulse density modulation (PDM) performed to a signal supplied to the power amplifier. The signal thus converted into a digital modulation signal, is thereafter amplified and the amplified signal is outputted as an analog signal via a low pass filter.

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Power amplifier product listings

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