Transfer characteristics [output voltage $(V_{0})$ vs input voltage $(V_{i})$ ] for a base biased transistor in CE configuration is as shown in the fig. For using transistor as a switch , It is used

in region (II)

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in region (I)

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in region(III)

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both in region (I) and (III)

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Solution

The correct option is D both in region (I) and (III)
Region (I) is the cut-off region, region (II) is the active region and region (III) is the saturation region.
If we use the transistor as a switch, the cut-off region (I) is used for OFF state as no current flows at its time and the saturation region (III) is used for ON state as large current flows at this time.
Hence, option (D) is correct.

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Transfer characteristics [output voltage (V0) vs input voltage (Vi) ] for a base biased transistor in CE configuration is as shown in the fig. For using transistor as a switch , It is used

Transfer characteristics [output voltage $(V_{0})$ vs input voltage $(V_{i})$ ] for a base biased transistor in CE configuration is as shown in the fig. For using transistor as a switch , It is used