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Intrinsic Distortion of a Fully Differential BD-Modulated Class-D Amplifier With Analog Feedback.
- Source :
-
IEEE Transactions on Circuits & Systems. Part I: Regular Papers . Jan2013, Vol. 60 Issue 1, p63-73. 11p. - Publication Year :
- 2013
-
Abstract
- This paper presents a mathematical analysis of a fully differential BD-modulated Class-D amplifier with analog feedback, i.e., one having a bridge-tied-load output configuration with negative feedback and ternary PWM signal. Notwithstanding the highly nonlinear nature of the amplifier's operation, an extremely accurate closed-form expression for the audible output signal is derived and verified based on computer simulations. This expression demonstrates that there exist larger high-order intrinsic distortions (e.g., 5th-order harmonic distortion and intermodulation distortion) for BD-modulation, compared to that for AD-modulation (binary PWM signal). Furthermore, the 3rd-order harmonic distortion has a roughly parabolic response as a function of the magnitude of the input signal and reaches its peak when the modulation index of the input signal is around 0.7. Overall, the BD-modulated Class-D amplifier has a larger intrinsic distortion for small input signal but a smaller intrinsic distortion for large input signal, compared to AD-modulated designs. [ABSTRACT FROM PUBLISHER]
Details
- Language :
- English
- ISSN :
- 15498328
- Volume :
- 60
- Issue :
- 1
- Database :
- Academic Search Index
- Journal :
- IEEE Transactions on Circuits & Systems. Part I: Regular Papers
- Publication Type :
- Periodical
- Accession number :
- 84675109
- Full Text :
- https://doi.org/10.1109/TCSI.2012.2215713