What is a defining feature of a Class D amplifier compared to Class A and B amplifiers?

A defining feature of a Class D amplifier, particularly when compared to Class A and Class B amplifiers, is its lower power consumption. Class D amplifiers operate by switching the output devices on and off rapidly, rather than keeping them in a linear state like Class A and Class B amplifiers do. This switching operation minimizes the amount of time that the transistors are active and wasting energy as heat, resulting in much higher efficiency and lower heat generation.

This efficiency allows Class D amplifiers to produce more power from less electrical energy, making them particularly beneficial for battery-operated devices or situations where cooling is a concern. The reduced power consumption of Class D amplifiers is essential for improving overall system performance, especially in portable or compact sound systems.

Other amplifier classes, like Class A and Class B, tend to operate with higher power usage and generate more heat, which can lead to increased operational costs and require additional heat management solutions. Thus, the characteristic of lower power consumption makes Class D amplifiers suitable for modern applications where efficiency is a key consideration.