SOT89 packaged MMIC SMD code

Hi all,

I am looking for the identity of a SOT89 packaged MMIC with marking code C4 (it runs on about 90 mA, and it is used in the 900 -2000 MHz range).

Any hints?

10x in advance, Al

PS. I searched Google and the SMD code book, no satisfying result.

it's most likely to be a medium power amplifier for cellular applications