Part of me thinks we need a smaller BJT, to reduce base emitter junction area. but I am confused

 

Part of me thinks we need a smaller BJT, to reduce base emitter junction area. but I am confused

Yes, you generally want a small junction area to reduce the parasitic capacitances.

 

Yes, you generally want a small junction area to reduce the parasitic capacitances.

awesome thanks so much

 

Usually parts are characterized on a Network Analyzer before being considered for high frequency design. There is no substitute for the right tools.