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reduce the bandwidth for the gain

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shanmei

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I need a gain from 4-6GHz. Out of the band, I would like to the gain fall down.

But from the simulation, the 2-stages PA has a flat gain at 1-4GHz range.

1.png



How can I have a gain like the the bellowing figure? Thanks.

2.png
 

In top of this, should be mentioned that usually the high pass filter is placed at the input, and the low pass filter should be placed at the output of the amplifier.
 
Thanks you.

The original input compensation network has one compensation stage. Now I change to two compensation stage, which greatly reduce the low frequency gain.
 

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