Class D Power Amplifier Based on Waveform Predistortion Technology

With the rapid development of wireless communication technology, out of the pursuit of higher spectrum efficiency and higher power efficiency, the linearization technology of class D power amplifiers has become an important research direction. The purpose of this article is to study the design and implementation of Class D power amplifiers based on waveform predistortion technology. It introduces in detail the causes and theoretical analysis of several non-linear distortions in the class D audio amplifier, and proposes corresponding solutions, and introduces the modulation methods of several popular class D audio amplifiers, as well as each method. At the same time, several main performance indicators and design points of Class D audio amplifiers are explained. The nonlinear distortion in the open-loop and closed-loop class-D audio amplifiers was modeled and analyzed separately, and some parameters that had a greater impact on the system performance were extracted. Although the frequency of the oscillator is less than 500kHz, it is still very close to the design index, which is low for the design. The distortion class D audio amplifier has great reference value.