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NEET PHYSICSMedium

Transfer characteristics [output voltage (VoV_o) vs input voltage (ViV_i)] for a base biased transistor in CE configurations are as shown in the figure. For using the transistor as a switch, it is used:

A

In region III

B

Both in the region (I) and (III)

C

In region II

D

In region I

Step-by-Step Solution

In the transfer characteristics of a Common Emitter (CE) transistor, the graph is divided into three distinct regions:

  1. Region I (Cut-off region): The input voltage is very low, and the output voltage is high. The transistor does not conduct and acts as an open switch (OFF state).
  2. Region II (Active region): The output voltage decreases linearly with an increase in input voltage. The transistor is used as an amplifier in this region.
  3. Region III (Saturation region): The input voltage is high, and the output voltage drops to a very low, near-zero value. The transistor conducts fully and acts as a closed switch (ON state). Therefore, for a transistor to function as a switch, it must operate between the cut-off region (I) and the saturation region (III).
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