ACWWong
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If you would like to test your LNA using the matching components you used in the simulation, then you'll be wanting to drive from a 200 ohm differential souce. This can be achieved using a balun which will transform 50 ohm source to 200 ohm differential using a 1:4 ratio. The balun can be sourced as a single component from usual suppliers (murata, toko etc. do a google search) or can be made from an LC bridge circuit if you only need the transform over a narrow frequency band.
Otherwise, matchup your circuit to 50 ohms directly and do your test, and adjust your simulation to compare the results...
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