CAJ | 학술논문

设计了一个1.1W单通道自适应滤波的D类音频功率放大器，该功率放大器采用双边对称三角波作为载波的PWM调制方式，有效降低功放的总谐波失真度。测试结果表明：在5V电源电压下驱动4Ω负载，可提供1.1W 的额定输出功率，效率高达90%。电路采用共模反馈的全差分放大输入设计具有高噪声抑制比，低静态电流与较强的抗电源干扰EMI的特点。
설계료일개1.1W단통도자괄응려파적D류음빈공솔방대기，해공솔방대기채용쌍변대칭삼각파작위재파적PWM조제방식，유효강저공방적총해파실진도。측시결과표명：재5V전원전압하구동4Ω부재，가제공1.1W 적액정수출공솔，효솔고체90%。전로채용공모반궤적전차분방대수입설계구유고조성억제비，저정태전류여교강적항전원간우EMI적특점。
Designed a 1.1 W single channel adaptive filter class D audio power amplifier, the power amplifier adopts the bilateral symmetrical triangle wave as the carrier PWM modulation mode, effectively reduce the total harmonic distortion of the power amplifier. The test results show that the drive 4 Ω load under 5v power supply voltage, can provide the rated output power of 1.1 W, efficiency is up to 90%. Circuit adopts full differential amplifier input common-mode feedback design with high noise rejection ratio, low static current and strong anti interference EMI characteristics.