rf current source

I have problem building a current source. I need the output of the amplifier circuit to be like a current source. Any suggestions for that? And I might need to control it freely.

An emitter follower ( common base-common drain)will behave a voltage controlled current source ( of course within certain limits) in RF.

If you have a capability to use CMOSRF, it will be easier to build voltage controlled current source.

Well, my problem here is the power level is nearly 30dBm. Most BJTs cannot operate linearly at that region. I am thinking of using MOSFET at the saturation level. But at the same time, the linearity is sacrificed a lot. That troubles me a lot.