is ist possible to match the internal Amplifier AMP2 from the ADL5243 over a wider bandwith than described in the datasheet. I would need to cover 950 MHz to 2150 MHz.
A circuit to match AMP2 on the ADL5243 from 950-2150MHz will be very difficult to implement. A 300-400MHz match is the best we have been able to achieve with surface mount components. I would suggest experimenting with the s-parameter model file provided on the ADL5243 product page. See link below:
The zip file contains a model file specifically for AMP2.