I see no problem with getting
the IP3=+50dBm by using a balanced amplifier topology
with the AH225. By using this topology, you will
get an increase of 3dB in P1dB and IP3 (minus the
insertion loss of the output hybrid coupler). IMD
products will therefore be reduced by 9dB and the
delta (P1-P3) will be around 6dB.
to S11 matching, which seems to be difficult in
the low frequency. Actually by using hybdid coupler
it should be easier.
Another advantage of
using the balanced amplifier for this device in
this specific frequency of operation is that it
will provide good stability. The AH225 has a very
high gain in this frequency and it will easy oscilate
when be used in single ended configuration.
Disadvantages are higher current and higher