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| 1. |
Can two separate p-n junction diodes placed back to back be used to form p-n-p transistor ? |
| Answer» Solution :No. When we join two p-n JUNCTIONS the n- region will from the BASE. For a transistor the base MUST be very thin and it must be lightly doped. These two conditions will not be satisfied when we make a transistor by JOINING two p-n junction. The thickness will be LARGE and doping will be heavy. So, p-n-p transistor cannot be formed by joining two p-n junction diodes. | |