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When transistors are used in digital circuits, they usually operate in the

When transistors are used in digital circuits, they usually operate in the Correct Answer saturation and cut off region

Digital circuits work on two levels:

1) 1 represented by Logic High

2) 0 represented by Logic Low

These High and Low logic are obtained by switching the transistors ON and OFF.

  • When a transistor works as a switch it works in cut-off and saturation regions.
  • In the cut-off state, both the emitter-base junction and the collector-base junctions are reverse biased.
  • But in the saturation region, both the junctions are forward biased.

 

This is explained with the help of the following circuit diagram:

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Saturation Region: ON transistor

Cut-off Region: OFF Transistor

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