![]() Linear-amplifier output stages are directly connected to the speaker (in some cases via capacitors). Linear Amplifiers, Class D Amplifiers, and Power Dissipation #Audio filter signal path portableThis difference gives Class D significant advantages in many applications because the lower power dissipation produces less heat, saves circuit board space and cost, and extends battery life in portable systems. Compared with Class D designs, the output-stage power dissipation is large in even the most efficient linear output stages. The many possible implementations for audio systems include Classes A, AB, and B. In a conventional transistor amplifier, the output stage contains transistors that supply the instantaneous continuous output current. Feedback is often used because high loop gain improves performance-suppressing distortion caused by nonlinearities in the forward path and reducing power supply noise by increasing the power-supply rejection (PSR). If the forward gain is part of a feedback loop, the overall loop gain will also be high. The forward voltage gain is usually high (at least 40 dB). #Audio filter signal path PcPower capabilities vary widely depending on the application, from milliwatts in headphones, to a few watts in TV or PC audio, to tens of watts for “mini” home stereos and automotive audio, to hundreds of watts and beyond for more powerful home and commercial sound systems-and to fill theaters or auditoriums with sound.Ī straightforward analog implementation of an audio amplifier uses transistors in linear mode to create an output voltage that is a scaled copy of the input voltage. Audio frequencies range from about 20 Hz to 20 kHz, so the amplifier must have good frequency response over this range (less when driving a band-limited speaker, such as a woofer or a tweeter). The goal of audio amplifiers is to reproduce input audio signals at sound-producing output elements, with desired volume and power levels-faithfully, efficiently, and at low distortion. What are Class D amplifiers? How do they compare with other kinds of amplifiers? Why is Class D of interest for audio? What is needed to make a “good” audio Class D amplifier? What are the features of ADI’s Class D amplifier products? Find the answers to all these questions in the following pages. Class D Audio Amplifiers: What, Why, and HowĬlass D amplifiers, first proposed in 1958, have become increasingly popular in recent years. ![]()
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