Small Chip IC identification request - top code 9N (or N6) in 3 x 3 pad package
It appears to be an "NBB-312 Cascadable Broadband GaAs MMIC Amplifier DC to 12GHz" made by RFMD (recently acquired by qorvo). Nice looking part, about $10 in 100's. 



Goodness knows what led them to mark it with reversible characters, no underline, and pin 1 in the upper right. Maybe that's an MMIC thing. Also note, it's not a BGA (no balls at all).