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电路如图，每一级放大20倍，阻抗匹配后变为10倍，每一级选择由继电器来切换，实际测试的时候两级级联的时候在30MHz以上会出现多次谐波，怎么解决呢？
电阻按芯片手册上选则，反馈电阻为750Ω，负向输入端为39Ω，正向输入端50Ω匹配
亲；这类高频信号，需要射频继电器切换。普通继电器会有问题。
