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lmh6401频率响应测试

Other Parts Discussed in Thread: LMH6401

您好,lmh6401实际测试过程中若输入一端接地则频率特性十分不好,即50M左右开始衰减(在TINA中仿真并无此现象)。当输入差分时200M(仪器限制)频率内输出的2路并不相同,表现为频率升高一端VPP增大,另一端VPP减小,但差分值基本不变,请问这两种情况是正确的吗,可否解释一下原因........