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NorColCir - Norton Collector Circuit The Norton equivalent...

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Norton Collector Circuit The Norton equivalent circuit seen looking into the collector can be used to solve for the response of the common-emitter and common-base stages. Fig. 1(a) shows the bjt with Thévenin sources connected to its base and emitter. With the collector grounded, the col- lector current is called the short-circuit output current or i c ( sc ) . The current source in the Norton collector circuit has this value. To solve for this current, we use the simpli fi ed T model in Fig. 1(b). The current i c ( sc ) can be solved for by superposition of v tb and v te . Figure 1: (a) BJT with Thevenin sources connected to the base and the emitter. (b) Sim- pli fi ed T model. With v te and αi 0 e sources set to zero, it follows from Fig. 1(b) that i c ( sc ) = v tb r 0 e + R te k r 0 R te R te + r 0 i 0 e = v tb r 0 e + R te k r 0 (1) With the v tb and αi 0 e sources set to zero, we have i c ( sc ) = v te R te + r 0 e k r 0 r 0 e r 0 + r 0 e i 0 e = v te R te + r 0 e k r 0 r 0 r 0 + r 0 e (2) With the v tb and v te sources set to zero, we have i c ( sc ) = αi 0 e i 0 e = 0 (3)
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