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级联无信号

Other Parts Discussed in Thread: THS4631, VCA820, THS3201

本人做了一个宽带放大器:

 第一级同相放大,2倍,ths4631,单极正常,输入输出无阻抗匹配

第二级增益放大VCA820,10倍,单极正常,级联正常;

第三极同相放大,10倍,ths3201,输入无阻抗匹配,输出50欧负载有信号,空载无信号,负载时单极存在严重高频过冲,到了60M时都放大40倍了,此时级联无信号输出。

求大神解决。参考电路和取值