Title :
An Analysis of THD in Class D Amplifiers
Author :
Foong, Huey Chian ; Tan, Meng Tong
Author_Institution :
Sch. of Electr. & Electron. Eng., Nanyang Technol. Univ., Singapore
Abstract :
The paper investigates the parameters affecting THD and PSRR in a PWM class D amplifiers with feedback. From our mathematical analysis, the authors show that the THD and PSRR of a PWM class D Amplifiers with feedback can be improved by shaping the frequency response of the 2nd-order integrator. The paper also shows how the THD can be further improved by means of dual-loop feedback. Simulation shows that the THD of the single-loop and the dual-loop feedback class D amplifiers can be improved by as much as 3 times and 12 times respectively
Keywords :
amplifiers; frequency response; harmonic distortion; mathematical analysis; pulse width modulation; 2nd-order integrator; PSRR; PWM class D amplifiers; THD analysis; dual-loop feedback; frequency response; mathematical analysis; Acoustic noise; Feedback loop; Frequency response; Low pass filters; Mathematical analysis; Negative feedback; Pulse amplifiers; Pulse width modulation; Space vector pulse width modulation; Switching frequency;
Conference_Titel :
Circuits and Systems, 2006. APCCAS 2006. IEEE Asia Pacific Conference on
Conference_Location :
Singapore
Print_ISBN :
1-4244-0387-1
DOI :
10.1109/APCCAS.2006.342110
