class-d amplifier

The main advantage of a class-D amplifier is power efficiency.

Class-D amplifiers can be controlled by either analog or digital circuits.

Output stages such as those used in pulse generators are examples of class-D amplifiers.

However, active speakers using lightweight Class-D amplifiers have narrowed the difference.

In the class-D amplifier the input signal is converted to a sequence of higher voltage output pulses.

An early use of class-D amplifiers was high-power subwoofer amplifiers in cars.

Integrated 5-channel surround sound class-D amplifier system (with at least 100 Watts output/channel)

Therefore, class-D amplifiers are typically smaller than an equivalent class-AB amplifier.

In a class-D amplifier, the output filter blocks all harmonics; i.e., the harmonics see an open load.

Class-D amplifiers for driving subwoofers are relatively inexpensive in comparison to class-AB amplifiers.

Indeed, all analog systems show discrete (quantized) behaviour at the microscopic scale, and asynchronously operated class-D amplifiers even consciously incorporate continuous time, discrete amplitude designs.

This new class T is a revision of the common class-D amplifier, but with changes to ensure fidelity over the full audio spectrum, unlike traditional class-D designs.

A class-D amplifier or switching amplifier is an electronic amplifier where all power devices (usually MOSFETs) are operated as binary switches.

This method is used in the SACD format, and reproduction of the encoded audio signal is essentially similar to the method used in class-D amplifiers.

As said in the class-D amplifier, the transistor is connected via a serial LC circuit to the load, and connected via a large L (inductor) to the supply voltage.

It is used for the creation of alternating current (AC) waveforms; most commonly to drive 3 phase AC powered motors at varying speeds from DC using multiple class-D amplifiers.

Sánchez Moreno, Sergio Class D Audio Amplifiers - Theory and Design [1] - Contains material on the theory and design of Class-D amplifiers.

Called "Class-D amplifiers", they produce a PWM equivalent of the analog input signal which is fed to the loudspeaker via a suitable filter network to block the carrier and recover the original audio.

Class-D amplifiers have been widely used to control motors, but they are now also used as audio power amplifiers, with some extra circuitry to allow analogue to be converted to a much higher frequency pulse width modulated signal.

Class-D amplifiers use MOSFETs (Metal Oxide Semiconductor Field Effect Transistors) rather than 'ordinary' (bipolar) transistors, and generate a pulse-width modulated signal that is filtered before it reaches the speaker.

Compared to an equivalent class-AB device, a class-D amplifier's lower losses permit the use of a smaller heat sink for the MOSFETs while also reducing the amount of input power required, allowing for a lower-capacity power supply design.