使用THS3001单极放大,反馈电阻3K,负反馈到地接360Ω电阻未接负载,20MHz时增益下降0.9dB,此后开始上升,40MHz时到达0dB然后继续上升。改为1K反馈电阻放大10倍输入7MHz信号增益开始增大,换用手册上推荐的720欧放大一倍也是增益一直上升。

滤波电容106+104,输入50Ω电阻未加,电源两侧为LED指示灯
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使用THS3001单极放大,反馈电阻3K,负反馈到地接360Ω电阻未接负载,20MHz时增益下降0.9dB,此后开始上升,40MHz时到达0dB然后继续上升。改为1K反馈电阻放大10倍输入7MHz信号增益开始增大,换用手册上推荐的720欧放大一倍也是增益一直上升。

滤波电容106+104,输入50Ω电阻未加,电源两侧为LED指示灯