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用LHM6643做100kHz-5MHz信号放大,不平坦

Other Parts Discussed in Thread: LMH6643

用LMH6643做放大电路(前级有100KHz-5Mhz滤波器),发现700kHz-5MHz一段不平,输出随着频率的增大而增大。

如,电路参数设置为0dB的时候,输入200mV  Vpp,1MHz时候输出幅度为210mV而3MHz的时候输出可达300mV !

于是仿真了一下,结果如图所示,MHz级以后果然是不平坦的,LHM6643的增益带宽积是130MHz,为什么会出现这种情况呢??