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Transistor as a switch
Concepts tested here
- Cut-off and saturation regions
All Questions
2012 AIPMT-PRE 1 question
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Transfer characteristics [output voltage ($V_0$) vs input voltage ($V_i$)] for a base biased transistor in CE configuration is as shown in the figure. For using transistor as a switch, it is used
Region I is the cut-off region (transistor OFF, output high) and region III is the saturation region (transistor ON, output low).
Region II is the active region, used for amplification.
A switch is operated between the OFF and ON states, so the transistor is used in both region I and region III.