Methods of forming and structures of a relatively large bipolar transistor
is provided. The method includes forming a collector in a semiconductor
region. Forming a base contiguous with a portion of the collector.
Forming a plurality of emitters contiguous with portions of the base.
Forming a common emitter interconnect and forming ballast emitter
resistors for select emitters. Each ballast emitter resistor is coupled
between an associated emitter and the common emitter interconnect. Each
ballast resistor is further formed to have a selected resistance value.
The selected resistance value of each ballast resistor is selected so the
values of the ballast resistors vary in a two dimensional direction in
relation to a working surface of the bipolar transistor.