School of Computer Science and Electrical Engineering 17/05/01 Behaviour The base region is very thin so that most of the electrons attracted to this region pass straight through it (attracted by the collector which is positive relative to the base) before there is much chance of recombination with the base s holes Because of this, the collector current is very nearly equal in alue to le thus with the current directions shown ic=-ale where a is close to unity(e.g, a=0.98) Lecture 11 ENG1030 Electrical Physics and Electronics B./T DownsENG1030 Electrical Physics and Electronics B.Lovell/T.Downs School of Computer Science and Electrical Engineering 6 17/05/01 Lecture 11 Behaviour • The base region is very thin so that most of the electrons attracted to this region pass straight through it (attracted by the collector which is positive relative to the base) before there is much chance of recombination with the base’s holes. • Because of this, the collector current is very nearly equal in value to Ie. Thus with the current directions shown Ic=-aIe where a is close to unity (e.g., a=0.98). DC DC n p n e b c Ie Ic Ib