raja.cedt wrote on Dec 17th, 2014, 9:23am:Hi,
I don't think there is trade off between noise and bandwidth, extra capacitance due to multiple gate connections could easily tuned out by gate inductor provided this LNA is going to be used in typical narrow band RF amp.
Once gate fingers reach certain number I think gate resistance will increase because intrinsic poly res will decrease but extra routing resistance will increase..i am not sure about this point, just guessing
Thanks,
Raj.
What you are saying about the resistance increasing after a certain number of fingers (and width ratio) is true. You should check on the process documentation to check for these details.
Usually they provide the maximum number of fingers, and width per finger until this phenomenon occurs. This and other stuff, like capacitance variations with fingers and width usually are described in the process documentation.
With best regards.