有源二分频音频放大电路(电赛2022C题)工程代码(STM32版)

上传者: 2305_79740746 | 上传时间: 2026-05-07 23:33:42 | 文件大小: 5.8MB | 文件类型: ZIP
有源二分频音频放大电路【2022全国大学生电子设计竞赛C题、TI杯】 要求制作一个有源分频网络,要求实现音频信号和功率放大 输入信号频率范围:100Hz ~ 20kHz, 幅度范围:10 ~ 100mV 输入阻抗大于10K,最大增益不小于46dB 高通滤波器的-3dB截止频率2kHz,阻带衰减率12dB/倍频程,负载电阻2W 低通滤波器的-3dB截止频率2kHz,阻带衰减率12dB/倍频程,负载电阻4W 高(低)通滤波与功率放大电路不允许用成品模块,预处理电路允许使用成品模块 首先将输入信号采用同相比例放大(输入阻抗满足10K)20倍,然后分别接入VGA(AD603)自动增益模块和RMS(AD637)有效值模块,然后通过STM32或FPGA的ADC读取其有效值,阅读AD603模块的使用说明得到采用程控增益的表达式,DAC输出控制自动增益模块使其始终输出有效值RMS=4V,这样以满足后面负载的要求,然后高低通滤波设计部分推荐几款好用的网站: 1.Analog Device 2.TI Design 设置好需要满足的性能要求,还有低噪声,低功耗,电阻电容等等个性化定制的选项,便可设计出原理图,然后再根据原理图画PCB(当然选择哪款网站肯定会主推自家的芯片) 最后的功率放大电路在淘宝找一家,便有了原理图画PCB,当然最好买一个实物也就几块钱,尽量看一看上面元件的参数,有些商家的原理图不太正确,需要自己甄别一下

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