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THS4271: 求:THS4271有没有稳定的可以放大40MHZ信号的放大电路

Part Number: THS4271

输入信号是连续载波(CW)或者是AM信号,频率在40MHZ,想要把信号放大到12V左右,自己设计了一个电路,但是放大倍数只有2.7左右,不知道是为什么。THS4271的增益带宽积是400MHZ,按理来讲40MHZ的信号可以放大十倍,但是实际运行时放大倍数远远不到,最多稳定在2.7倍左右。