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  4. The transfer characteristics of a base biased common emitter transistor is shown in the figure. <img class=img-fluid question-image alt=image src=https://cdn.tardigrade.in/img/question/physics/a48e47b6caa67ee0c50f350b23e5a468-.png /> Which of the following statements are true?

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Q. The transfer characteristics of a base biased common emitter transistor is shown in the figure.
image
Which of the following statements are true?

Semiconductor Electronics: Materials Devices and Simple Circuits

Solution:

image
From the given transfer characteristics of a base biased common emitter transistor,
$(i)$ When $V_i = 1\, V$, which is in between $0.6\, V$ to $2 \,V$, the transistor circuit is in active state and is used as an amplifier.
$(ii)$ When $V_i = 0.5 \,V$, there is no collector current. The transistor is in cut off state. The transistor circuit can be used as a switch turned off.
$(iii)$ When $V_i = 2.5\, V$, the collector current becomes maximum and transistor is in saturation state and can be used as switch turned on state.