An Analysis of THD in Class D Amplifiers

– In this paper, we investigate the parameters affecting THD and PSRR in a PWM Class D amplifiers with feedback. From our mathematical analysis, we 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. We also show how the THD can be further improved by means of dual-loop feedback. Simulation shows that the THD of the singleloop and the dual-loop feedback Class D amplifiers can be improved by as much as 3 times and 12 times respectively.

• Type: Conference
• Year: 2006
• Where: APCCAS
• Authors: Huey Chian Foong, Meng Tong Tan
• Keywords: APCCAS 2006, Dual-loop Feedback, Hardware, Parameters Affecting Thd, PWM Class