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

1. in region III
2. both in region I and (III)
3. in region II
4. in region (I)

Correct answer: both in region I and (III)

Solution

A transistor in CE configuration acts as a switch when it operates in both saturation (region III) and cutoff (region I) regions. In saturation, it acts as a closed switch, and in cutoff, it acts as an open switch.

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