THD Analysis in Closed-Loop Analog PWM Class-D Amplifiers

Amiri, P.; Kohestani, M.; Seifouri, M.

doi:10.22061/jecei.2014.36

Document Type : Original Research Paper

Authors

Faculty of Electrical and Computer Engineering, Shahid Rajaee Teacher Training University, Tehran, Iran.

https://doi.org/10.22061/jecei.2014.36

Abstract

In this paper, we investigate the parameters affecting Total Harmonic Distortion (THD) and Power Supply Rejection Ratio (PSRR) in PWM Class D Amplifiers (CDAs) on the basis of linear models with feedback. From our mathematical analysis, we show that the THD of a PWM Class D amplifier with feedback can be improved by increasing the gain of the integrator through adding another amplifier at the output of the integrator. We also show that the THD can be further improved by means of two cascaded amplifiers with a single pole. We verify our analysis by means of PSPICE simulations. Simulation results show that the THD of the gain boosting and the two cascaded amplifiers with a single pole CDAs can be improved by as much as 1.4 times and 2 times, respectively.

Keywords

20.1001.1.23223952.2014.2.1.1.8

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Journal of Electrical and Computer Engineering Innovations (JECEI)

THD Analysis in Closed-Loop Analog PWM Class-D Amplifiers

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Volume 2, Issue 1 - Serial Number 3
January 2014
Pages 1-5

THD Analysis in Closed-Loop Analog PWM Class-D Amplifiers

Send comment about this article

Volume 2, Issue 1 - Serial Number 3January 2014Pages 1-5

Volume 2, Issue 1 - Serial Number 3
January 2014
Pages 1-5