各位专家，大家好。麻烦帮小弟提供一点方案，关于小信号放大的可控增益放大电路。。输入信号-40DB，频率12.5K，我仿真了三种方案都觉得不妥，使用了AD604/AD8253/PGA821等几种，需要放大100DB给后端ADC提供好的动态范围。。求大神指点一下。。谢谢啦，求救
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