摘要
提出了基于脉冲宽度调制(PWM)的音频功率放大器,利用较新颖的反馈结构改善了总谐波失真及噪音(THD+N)与电源抑制比(PSRR)。该电路工作电源电压2.4V～5V,电路闭环增益可以实现6dB,12dB,18dB,24dB变化。采用CSMC05 CMOS工艺设计,实现了高效率,低功耗,高保真。
This article proposes an Audio-Frequency-Power-Amplifier which is based on Pulse-Width Modulation （ PWM ） .It uses an novel feedback circuit to improve the THD＋N and PSRR .It can operate in a relative wide range of 2.4V-5V. and it＇ s loop gain can vary in a rang of 6dB, 12dB, 18dB, 24dB. The amplifier was implemented in CSMC05 CMOS process, realizing high efficiency, low power consumption and high fidelity.
出处
《中国集成电路》
2008年第10期61-64,共4页
China lntegrated Circuit
关键词
总谐波失真
电源抑制比
脉冲宽度调制
Total humorous distortion, Power-Supply-Rejection-Ratio, Pulse-Width Modulation
