Output matching for cascode LNA

[engrvip]

I am designing a single stage source degenerated cascode LNA. I have understood most of it theory regarding input matching but dont understand how to do output matching of thi LNA ?

Hope someone can explain it to me.

Regards
Vipul

 

[vfone]

First, the output matching in LNA design should meet the stability requirements of the stage. And second, the matching network should be tuned for highest IP3 and required gain.
A usual topology for output matching of a single transistor LNA, is a simple LC network (series inductor followed by a shunt capacitor).
The DC bias of the transistor could be supplied to the Vcc through a choke. Sometimes the choke is a an inductor part of the output matching network.
At microwave frequencies some of the matching components can be replaced by microstrip lines.