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How to size a bipolar transistor?

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eldo

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Is currrent density the only constraint in sizing a bipolar transistor? Thanks.
 

Yes.
In the case of mosfets you can design circuits by adjusting W and L. Bipolar design is different from mos. There are already made optimized transistor layout for bipolars, depending on application (i.e high speed, high voltage...). Only you can do is to select and connect more this bipolars in parallel, when you need greater current density, optimal β(Ic), or smaller base resistance. As a result bipolar design is usually concentrated on optimization of different circuit topologies, while mosfet design on optimizing size of components.
 

Thanks pixel. It seems CMOS overwhelms Bipolar these days. However I think bipolar is better for analog except the cost.
 

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