What is a Class D Amplifier?
A Class D amplifier is an electronic amplifier in which the amplifying devices (transistors, usually MOSFETs) operate as digital switches rather than linear gain devices. The signal is encoded in a pulse-width modulation (PWM) scheme, and the output transistors rapidly switch between fully on and fully off states, passing only a modulated carrier wave that is proportional to the input signal amplitude.
Class D amplifiers offer several advantages over traditional Class A, B, and AB amplifiers. They are more efficient, as they do not waste energy in the form of heat. This makes them ideal for applications where power is limited, such as car audio systems and portable audio devices. They also produce less distortion than traditional amplifiers, as the switching of the transistors eliminates the need for a linear gain stage. Additionally, they are usually smaller and lighter than traditional amplifiers, making them easier to install and transport.
Class D amplifiers are used in a variety of applications, from professional audio systems to home audio systems. They are also used in automotive audio systems, as well as in portable audio devices such as MP3 players. They are becoming increasingly popular due to their efficiency and low distortion.