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VCA810后级级联放大器THS3001直接被拉低

Other Parts Discussed in Thread: OPA602, THS3001, VCA810

我是用VCA810进行程控的放大,在放大10mv信号时有一定的信号杂波!后级想接一级THS3001的10倍放大,直接连接,信号会被拉低,使用OPA602作为跟随器,跟随器输出的信号明显比VCA810输出的信号的干扰多很多,而且输入THS3001后THS3001无法正常工作。求指导!