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30MHz Clock buffer using the LTC6252/3/4

Hello all,

I want to design a 30MHz clock buffer using the LTC6252/3/4. the input is actually a clipped sine wave TCXO with 0.8V amplitude.

I don't have many experience in designing with opamps, so I used LTspice.

The design look like this (Singe 3V supply, G= ~1):

Running the sim in 10MHz looks fine:

As soon as I go above ~30MHz, for example 50MHz, the output is distorted and looks more like a triangle wave:


Can someone please explain why this is happening? 

Thanks a lot!



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