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中文摘要：
基于CSMC0．5μm DPDM CMOS工艺，实现了一种具有2．1声道的D类音频功率放大器的设计，该功放由一个全桥差分输出结构的重低音功率放大器和两个半桥单端输出结构的立体声功率放大器构成。详细介绍了2．1声道D类音频功放的整体结构、前置运算放大器和轨至轨比较器的电路设计。仿真和测试结果表明：在电源电压5V，该功放可向3Ω负载电阻提供2．5W＋0．6W×2的输出功率；在电源电压3～6V范围内，最大转换效率可达90％以上；重低音通道的总谐波失真与噪声之和小于0．7％，立体声通道的总谐波失真与噪声之和小于1％。
英文摘要：
This paper presents a 2. 1 channel stereo and bass class-D power amplifier based on CSMC 0. 5 μm DPDM CMOS process. The amplifier is composed of a bass output designed as differential bridge-tied-load and two stereo outputs designed as single-end. The preamplifier, rail-to-rail comparator and the whole 2.1 channel class-D power block are introduced in detail. The results of simulation and measure show that the power amplifier can deliver 2.5 W-l-0. 6 W × 2 into 3 Ω loads at power supply voltage 5 V. The maximal efficiency of the amplifier is up to 90% from 3 V to 6V power supply voltage. The THD＋N of the bass channel is less than 0. 7%, and that of the stereo channel is less than 1%.
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