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

Author

Tan, Meng-Tong ; Chua, Hock-Chuan ; Gwee, Bah-Hwee ; Chang, Joseph S.

Author_Institution

Sch. of Electr. & Electron. Eng., Nanyang Technol. Inst., Singapore

Volume

4

fYear

2000

fDate

2000

Firstpage

193

Abstract

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

Keywords

amplifiers; electric impedance; harmonic distortion; low-power electronics; nonlinear network analysis; pulse width modulation; switching circuits; PWM; THD; carrier nonlinearity modelling; carrier waveform linearity; class-D amplifiers; design parameters; low-power amplifiers; low-voltage amplifiers; mathematical analysis; output stage impedance; total harmonic distortion; Filters; Impedance; Linearity; MATLAB; Mathematical analysis; Pulse amplifiers; Pulse width modulation; SPICE; Space vector pulse width modulation; Total harmonic distortion;

fLanguage

English

Publisher

ieee

Conference_Titel

Circuits and Systems, 2000. Proceedings. ISCAS 2000 Geneva. The 2000 IEEE International Symposium on

Conference_Location

Geneva

Print_ISBN

0-7803-5482-6

Type

conf

DOI

10.1109/ISCAS.2000.858721

Filename

858721