How to design a RF VGA

Hi~!
I would design a VGA, which work frequency is about 2GHz. I haven't any experience about this. Can you give me some idea or paper. Thanks very much.

Now I am also focusing the design of VGLNA or LNA+VGA.

https://www.edaboard.com/viewtopic.p...gain+amplifier
https://www.edaboard.com/viewtopic.p...gain+amplifier