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各位老师，
对于这个VCA820的AGC电路，我个人的理解是：
1、进入检波电路的信号会是整个放大电路的输出信号幅值
2、积分电路的参考端Vref应该是预想的电压值
3、820的增益控制电压范围是0~2V,我想知道通过这个电路如何能对应地得到只能增益控制电压？？
