| Summary: | 碩士 === 國立交通大學 === 電機學院電機與控制學程 === 103 === Class-D audio amplifier is suitable for audio mobile applications. Due to its high power efficiency, heat loss and bulky heat sink can be removed in those applications. Generally, the Class-D audio amplifier is divided into two types: full-bridge and half-bridge. The full-bridge Class-D audio amplifier needs two power MOSFET switches at the cost. Besides, internal resistance of power switches increase heat generation and thus the efficiency is reduced. On the other hand, an obvious advantage of the half-bridge Class-D audio amplifier is the area saving but it sacrifices power supply rejection ratio (PSRR) performance. In other words, an additional feedback circuit for improving PSRR improvement is needed in this thesis.
The non-overlapping technique is widely used in Class-D audio amplifier design in order to avoid the short-through current. But peak noise is generated in case of power MOSFET switching. In this paper, a half-bridge Class-D audio amplifier with slope compensation and sleek non-overlapping techniques is proposed to improve peak noise efficiently without degrading the PSRR and EMI performance.
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