基于PWM的D類(lèi)音頻功率放大器設(shè)計(jì):提出了基于脈沖寬度調(diào)制（PWM）的音頻功率放大器，利用較新穎的反饋結(jié)構(gòu)改善了總諧波失真及噪音（THD+N）與電源抑制比（PSRR）。該電路工作電源電壓2.4V~5V，電路閉環(huán)增益可以實(shí)現(xiàn)6dB，12 dB ，18 dB ，24 dB 變化。采用CSMC05 CMOS 工藝設(shè)計(jì)，實(shí)現(xiàn)了高效率，低功耗，高保真。
Abstract：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.
關(guān)鍵詞：總諧波失真，電源抑制比，脈沖寬度調(diào)制
Abstract：Total humorous distortion，Power-Supply-Rejection-Ratio, Pulse-Width Modulation