Physics - Semiconductors Question with Solution | TestHub
An n-p-n transistor can be considered to be equivalent to two diodes connected. Which one of the following figure is correct?
Options:
Answer:
Solution:
An n-p-n transistor consists of three regions: an n-type emitter, a p-type base, and an n-type collector.
This structure forms two p-n junctions: one between the base and the emitter, and another between the base and the collector.
A p-n junction can be represented by a diode, where the p-type side corresponds to the anode (the flat side of the triangle) and the n-type side corresponds to the cathode (the straight line).
For an n-p-n transistor:
1. The base is p-type, so it acts as the common anode for both equivalent diodes.
2. The emitter and collector are n-type, so they act as the cathodes.
Therefore, the equivalent circuit consists of two diodes with their anodes connected together at the base terminal (), and their cathodes connected to the emitter () and collector () terminals respectively. This means the diodes should point away from the base towards the emitter and collector.
Looking at the given figures, the second figure correctly shows the anodes of both diodes connected to the base (), with the cathodes connected to and .
Answer:
