School of Computer Science and Electrical Engineering 17/05/01 Behaviour The current that does not go through the collector forms the base current so that we have Ib=-(1-a)le From this Typicallyβ=50to200 The parameter B is called the dc current gain and represents the current amplification of the transistor Indeed the use of the transistor as an amplifier is one of its main applications Another major application is using the transistor as a switch So what do they look like? 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 7 17/05/01 Lecture 11 Behaviour • The current that does not go through the collector forms the base current so that we have Ib=-(1-a)Ie. • From this Typically b=50 to 200 • The parameter b is called the DC current gain and represents the current amplification of the transistor. • Indeed the use of the transistor as an amplifier is one of its main applications • Another major application is using the transistor as a switch b a a = - = b 1 c I I So what do they look like?