VCA821反馈电阻的值设定有限制吗,增益电阻的大小和输入信号的范围有关,如果要做到40dB,电阻又该如何设置?
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可参考下datasheet中Figure 6.关于 Recommended RF vs AVMAX的曲线,知道Rf的值,根据公式变能计算出Rg的值。