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两片opa847级联对带宽和增益的影响



将两片847级联,如附件所示(单级电路图是参考datasheet)。由于R5和R1分压作用,放大倍数只有10*10=100倍。带宽有350多兆赫兹。

将R5去掉后,增益有10*20=200倍,但是带宽却只剩160多兆,这是为什么?

如何权衡使得两片847级联有200倍放大倍数同时还能保证带宽有300多兆?并且做到输出50欧的阻抗匹配?

4.11.TSC