如图，两个AGC电路所接的OPA820接法是不一样的。在VCA810里面，OPA820是作为比较器的，那在VCA821里面为什么没有了后面的保持电容？，两个图里面跨接输出和反相输入端的电容不是频率补偿的作用吗？各位能不能对照这两张图给我讲解一下，谢谢了。
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关于VCA810和VCA821的AGC电路疑问
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