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Please use this identifier to cite or link to this item: http://hdl.handle.net/1807/18294

Title: Integrated Distortion Suppression Circuit for a High Fidelity Digital Class-D Audio Amplifier
Authors: Feng, Yu
Advisor: Ng, Wai Tung
Department: Electrical and Computer Engineering
Keywords: electronics
class D
Issue Date: 18-Jan-2010
Abstract: Due to the lack of feedback networks, digital class D amplifiers operating in open loop typically have inferior performance when compared to analog class D amplifiers in closed loop configuration. This thesis presents an integrated distortion suppression circuit design for digital class D amplifiers, which forms a feedback loop around the output stage. This circuit suppresses the output stage distortion and noise by equalizing the modulator effective duty ratio and the output stage effective duty ratio. The suppression circuit is integrated with the class D modulator. An integrated class D amplifier output stage is implemented separately using a 0.35μm HV-CMOS technology. Experimental results confirm that the closed loop PSRR is improved by 15dB. The THD+N value is reduced by a factor of 2 to 30. The minimum THD+N is 0.03%, which is among the state of the art class D amplifiers.
URI: http://hdl.handle.net/1807/18294
Appears in Collections:Master
The Edward S. Rogers Sr. Department of Electrical & Computer Engineering - Master theses

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