A speaker driver for a single phase supply class G & I

作者：Yong Feng, Shanshan Yang, Zhenfei Peng, Zhiliang Hong, Yang Liu · 发表于：Journal of Semiconductors · 年份：2011 · DOI：10.1088/1674-4926/32/3/035005 · 被引用次数：1 · 研究领域：Analog and Mixed-Signal Circuit Design、Advanced Adaptive Filtering Techniques、Advanced Power Amplifier Design

A speaker driver applied to class G/class I with a single phase power supply is presented. Gain expanding and compressing technology are employed in the signal processing circuit to optimize power dissipation. The circuit is implemented in 0.18 μm N-well CMOS. Experimental results show that the speaker driver has a good audio sound quality and power efficiency. Less than 0.006% THD at a low power range and less than 0.4% at a medium power range can be obtained with a 1 kHz sine wave signal. Maximum output power of 360 mW can be gained at a load of 8 Ω. The power efficiency is about twice that of a traditional class AB driver at the power range of 80 mW and shows more than 18% improvement at the higher output power range.