Electrical engineering

Physics

Waveform

Spice

MATLAB

Total harmonic distortion

CMOS

Operating system

Harmonic

Distortion (music)

Engineering

Harmonic analysis

Voltage

Artificial intelligence

Amplifier

THD analyzer

Nonlinear distortion

Acoustics

Electrical impedance

Control (management)

Electronic engineering

Computer science

Output impedance

Control theory (sociology)

Linearity

In this paper, we investigate two important and practical design parameters for the design of low-voltage low-power class D amplifiers that may affect the Total Harmonic Distortion (THD): the linearity of the carrier waveform and the impedance of the output stage. By means of a novel mathematical analysis method to model the carrier non-linearity, we show that this non-linearity should be mitigated to achieve low THD. Our mathematical analysis also provides an insight to the degree of non-linearity acceptable for a practical design. We show that the impedance of the output stage has little effect on THD. We verify our analysis by means of MATLAB and SPICE simulations.

An investigation on the parameters affecting total harmonic distortion in class D amplifiers