high speed pulses with AD8009an in ADIsimPE

Hi all,

I am trying to simulate high speed pulses with AD8009an.

Input signal are short pulses 500ps rise time, 500ps width, 8ns fall time, 12,5ns period (red trace).

I want the signal to be amplified (gain 2) and offset to be symmetrical to 0V.

The output is not quite what I would have expected...

Even if I reduce speed, the result is not what I would expect from theory.

The offset is not as predicted. An offset of -1V should be added, but the simulation says its less:

I tried LMH6702 which should have even greater bandwidth, but results are even worse:

Is this a problem with ADIsim or is the Opamp not suited for this purpose?

Hi Harry,

thanks for the quick reply!

Changing the resistors did miracles ;-)

I am now gathering some basic info on current feedback OpAmps.

I literally knew nothing about those speciality parts and have to learn a lot...

The document you referenced is a valuable source to start, thank you very much!

Best regards,

John

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