Simulating ADL5536 Gain Block with Ideal Amplifier
The opamp model in lt spice is an ideal model which has the following properties:


Infinite voltage gain
Infinite input impedance
Zero output impedance
Zero input offset voltage.


which you have to be careful because the op amp can source infinite amounts of current or voltage. The model also has 1 pole 'filter' on the output to limit the bandwidth, and open loop gain.

These can be set by changing the Aol (open loop gain) parameter and GBW (bandwidth) parameter.