How to design audio circuits How to design an ideal Class D amplifier? | ||2004-7-8 9:53:27 EDN CHINA Electronic Design Technology Author: Wolfson Microelectronics Company || (Huaqiang Electronic World Network News) In the era of multi-channel and digital audio sources, it is a general trend to use Class D amplifiers to simplify the pre-stage circuit, improve the efficiency of the power amplifier, and thus reduce the requirements for power supply and heat dissipation. However, although Class D amplifiers are also called digital amplifiers, the circuit design is by no means as simple as pure digital circuits, nor can it be done by directly using one or two chips. To achieve analog functions by digital means, many analog factors still need to be considered, but the factors and angles considered are very different from those of traditional linear amplifiers. In addition to introducing the basic principles and benefits of Class D amplifiers, this article also focuses on the output stage design, power amplifier tube selection, power supply, electromagnetic compatibility, and some issues that need to be paid attention to in circuit board layout. These practical knowledge can help designers reduce the trouble of taking detours. || || || ||[pic] || …
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